Then you should check all the vacuum hoses — a leaking hose can cause a too-lean mixture and a rough idle. 1990 Mercedes Benz W126 V8 560 / 420 HIGH IDLE WHEN WARM. For the ECM to properly control idle, the throttle stop screw must be set for "minimum air". Have to keep the idle above 1500 rpm's to keep it running. This is what most of our customers prefer when building there strip/street car. A low TPS voltage may also cause ratcheting when the engine is not running. They search their local area (even 100's of miles away) for dyno tuning facilities to unlock the full potential of the engine and they quickly realize there are no shops that are willing or can tune their LT1 PCM. If you have any questions about your V6 Mustang or just want to connect with other V6 Mustang owners around the world, you have found the best place on the internet to do that. This Is one of the highest capacity Triple disc you can buy, the LT1-R Triple will hold 1800 rwhp and is the record holder for a T56 car going a staggering 8. When it starts on the second crank, it will usually idle high, around 1400-1600 RPM's, and take about 30-45 seconds to drop to around 800-1000 RPM's. Heads and Cam Install Guide for a 1994 LT-1. The PCM will retard spark timing when enough detonation (spark knock) is detected. These are the newer style skinny injectors, with EV1 electrical connections. Just like you can make 400 hp with an LT1, I think 300 on an L99 is doable. FUEL FLOW DYNAMICS. of seat lead or 330 lbs. Plug & Play fit to OEM harness. Typically my car will start fine when it's been sitting overnight. Idle Problems - LT1 w/New 24X system I recently upgraded to the 24X LS1 Ignition system due to an Opti issue. The pcm uses the MAF to determine the amount of fuel delivery to the engine. Read about the LT1 block and cams and see pictures of the Edelbrock heads, MSD Ignition, COMP cams, beehive valve springs, and more, inside Popular Hot Rodding Magazine. 96 Pontiac TA (6 speed). RPM = 625 The actual idle RPM which you can see is far less than the Idle RPM or desired idle. The most common fuel system problems that can cause idle issues are a malfunctioning fuel pressure regulator or dirty or leaking fuel injectors. The car will sit for the time I'm in the gym maybe an hour and then won't restart. These PCM's have the ability to determine a cylinder misfire and will even tell you which cylinder midfired. Shop Valve Olds Chevrolet now! Buy Valve Olds Chevrolet from Ebay. New OEM LT4 Replacements Injectors 12682374 High HP GM Gen V LT1 LT4 LT5 L83 L86 Camaro Corvette CTS V Escalade, best lowest sale price at WEAPON-X Motorsports. camaro LT1 runs great, but idle speed varies when hot At operating temp, after idling for awhile the idle speed - Chevrolet 1994 Camaro question Search Fixya Press enter to search. Great bottom end with the L82, Improved hi RPM with the LT1. If your car has a rough idle, it may be because your idle speed setting is incorrect. I haven't had a chance to do the c101 elimination yet, but I've narrowed the high idle down to something unrelated I think. 3 Wiring Harness Info Includes: Camaro/Firebird, Corvette, Caprice/Impala, Roadmaster. com, 1955 Chevy 1956 chevy 1957 Chevy Forum , Talk about your 55 chevy 56 chevy 57 chevy - Belair , 210, 150 sedans , Nomads and Trucks, Research, Free Tech Advice. It turned out that the idle checked out to be at the specified 975 rpm (high for most motors, but I was told this motor with the ASA cam was programmed to that rpm). When the engine is warm and at "high idle condition" try tapping on the IAC lightly w/handle of a screwdriver to see if idle comes down and/or engine shuts off-- if so a sticking IAC is likely the culprit. EVERYTHING CHECKS OUT FINE. I need some ideas for this car please. When I bought the car in 08, the car ran perfect, no problems, then out of nowhere, it developed an idle issue. Then I'll drive to the gym which is 2 miles away. Let’s get this out of the way up front: The litany of breakdowns suffered by our long-term 2014 Chevrolet Corvette Stingray Z51 (C7) was simply appalling. Siemens-80LB-EV1-8. By comparison, according to GM's numbers, a V12 engine from a Ferrari Berlinetta offers 28 percent less torque even though it produces 12 percent more top horsepower. Adjust your Early C4 TPS and Idle Speed by Lars Grimsrud SVE Automotive Restoration Musclecar, Collector & Exotic Auto Repair & Restoration Broomfield, CO Rev. it should self-calibrate. Normally, a vehicle should have a smooth and consistent. So it may have overheated when I shut engine off. 2 Disconnect Timing Jumper at distributor (Tan wire with Black stripe). I'm thinking its either the IAC valve or the TPS is bad. then start it while giving it no throttle. Need the complete Cam Install Package? 6th Gen Camaro C7 Corvette (Please note: These are high lift cams. A vacuum leak on a fuel injected engine will cause high idle. This page basically shows you step by step how to do an Idle Relearn. The symptoms of a dirty throttle body include rough idle, poor gas mileage, faulty CEL codes, stalling and poor acceleration. this is a function done by the computer. On the 1994-1997 LT1 F-body PCM, there is a replaceable module that receives the knock signal. Advanced Tips for EFI Tuning with Fuel Pressure Changing the fuel pressure on an EFI System is an effective method of affecting engine performance and making more power. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. how to replace the IAC valve on a 96 impala ss music by @66_kingz via twitter follow my IG page: @ 96_kingz Replacing The IAC valve on LT1 SS super sport dreams. The vacuum screw acts like a vacuum regulator. It is very important that the engine vacuum remain steady at idle. First get a replacement screw, you should be able to get one from a parts supply that handles Holley carbs. 00 Survivor 1970 Z28 Camaro Lt1 Corvette 350 Carb And Intake 3972110 4555 3972121 9a1 Survivor 1970 Z28. Another LT1 Idle Problem. I am getting around 8 miles to the gallon and my fuel trim is around 90 at idle. The TPI engine IAC valve (left) has a slightly different conical pintle shape than the others. With the updated ports, lightweight custom stainless valves, and high end. The ID2000 has set the standard for linearity and control in a large injector. Tampa Tuning specializes in the following high performance vehicles and trucks for tuning: 1997-2018 Chevrolet Corvette C5, C6, C7 including ZR1, Grand Sport, Z06s ( LT1 & 4 + $100) 1998-2018 Chevrolet Camaros Generation 4 and 5 Z28, SS, RS ( V6, LT1 & 4 + $100). Part Number 307015: GM LT1/LT4 Style Idle Air Control valve. Indmar old PT # 55-6085 now superceeded by S556094. The LT1228 current feedback amplifier has very high input impedance and therefore it is an excellent buffer for the out-put of the transconductance amplifier. The B bodies, LT1 and L99, all got the same tiny cam (less than 200 duration and only a little over. Below are common failures which are likely to produce high Hydrocarbon HC. This is standard with all kits but many choose not to install it. The LT1228 current feedback amplifier has very high input impedance and therefore it is an excellent buffer for the out-put of the transconductance amplifier. ATK has teamed up with FITECH EFI for our Complete Engine Packages with EFI (Electronic Fuel Injection). To increase idle rpm the ECM moves the IAC valve out allowing more air to pass by the throttle plate. View all 14 consumer vehicle reviews for the Used 2009 Chevrolet Suburban on Edmunds, or submit your own review of the 2009 Suburban. 1100 rpms doesn't sound high to me for the cold-weather idle right after you start it, but 1100 is too high for the engine after it's warmed up. Backed the idle down to 900. I have an LT1 motor, Camaro spec, with a high volume oil pump. Does the ECT sensor send information to the ECM only? or does it also send information to the guage?. We specialize in a wide-variety of high-quality car parts and accessories for your car, truck or SUV. Shop Valve Olds Chevrolet now! Buy Valve Olds Chevrolet from Ebay. I'm thinking its either the IAC valve or the TPS is bad. The top community for Ford truck, F150, Super Duty, and SUVs owners and enthusiasts. Flow Rate in LB per hour: 80 LBS/HR @ 43. Certify the power train. Late model and import high amp alternators are custom made to give you unsurpassed performance and durability. fuel pressure is 41-47PSI key on engine off. Readjust throttle stop screw for recommended idle speed. This is a plug in modification after you drill a 7/8 inch hole in the air cleaner shroud and does slightly increase horsepower. 96 SS Pulsing Idle & Fuel Smell after reading that it may test fine but act up under high temperature. When I start, the vehicle idles at about 1300 RPM and the idle control is set to idle at 830 RPM when the engine is at temp. If you have any questions about your V6 Mustang or just want to connect with other V6 Mustang owners around the world, you have found the best place on the internet to do that. I'm starting to think the intake manifold may be leaking. The nucleus of the LT4 is GM's naturally aspirated, 455-horsepower, 460-lb-ft, 6. I take ABSOLUTELY ZERO CREDIT for the length of material you're about to read, however I have made a few comments in-text that you can see which I will highlight in green. Most orders placed before 1:30PM eastern time get shipped out on the same day! Secure SSL encrypted shopping! Interested in Net Terms?. It even gets good gas mileage on the highway!. He found 34° as the ideal spot for idle, for his LT1 with the Hotcam and a full point increase in compression ratio (11. The F-body uses only one sensor. Great for the guys with n/a setups or power adders looking to daily drive their cars or take them to the track, this setup will do it all. DIAGNOSE – ENGINE IDLES TOO HIGH. 's parts are designed, intended, advertised and sold exclusively for installation on vehicles in compliance with state and federal law. Roller Camshaft,92-97 Chevy LT1/LT4 made by Edelbrock, for as low as $391. I'm thinking its either the IAC valve or the TPS is bad. If the throttle body and IAC have not been cleaned recently try that. Cleaning. I have a 98 GMC sierra 5. HD Cloyes 3039 timing gears and chain, low milage fuel regulator, EGR, Ignition Control Module, Idle Air Control Valve, Bag of stock 24lb fuel injectors unknown condition. I think that my car is staying in open loop but I'm not 100% sure so I'll talk about some of the problems it is having. Read about the LT1 block and cams and see pictures of the Edelbrock heads, MSD Ignition, COMP cams, beehive valve springs, and more, inside Popular Hot Rodding Magazine. Main Spark Tables The VCM constantly looks up both High Octane and Low Octane spark tables and interpolates a value between the two tables based on the current Knock Learn factor. Our N/A packages focus on helping the engine breathe which creates more horsepower/torque while retaining a high level of reliability and great street manners. LT1 engine idle too high when the engine starts the idling is around 1500rpm, and when its warm it goes down to 1200rpm which is really an issue as the car is Auto Transmission and breaking is hard. Adjust with air cleaner removed. If the idle air control valve is malfunctioning, it will cause the engine to idle rough, too low, too high, or irregular. According to the dyno chart, the LT4 produces 457 lb-ft of torque just off idle and 625 lb-ft by 2,800 rpm. Carbon Monoxide is a by-product of incomplete combustion. You may also notice a high idle if the valve is stuck in the open position. This is beneficial for the high compression LT1. Fast idle and idle control is determined by the air regulator, the Auxiliary Air Control (AAC) valve and the F. 01" of the pin is extended from the front of the camshaft, The same as in the production part. If the condition exists in all rpm ranges, the cause is more likely a fuel supply issue caused by low fuel pressure, a restricted injector or a defective sensor input. LE LT1 Custom Cam list. This was accomplished by using computer controlled ignition timing, a low restriction exhaust system, a more aggressive camshaft profile and free-flow. These pigtails allow for direct replacement of missing or damaged LS1/Vortec/LT1 Idle Air Control connectors on Drive By Cable Applications only. It displaced 5. Are you looking on improving the overall performance of your engine? With this C4 Corvette 1992-1996 LT4 Edelbrock Performer Air Gap, it will utilize the proven short runner tunnel-ram style to improve overall performance in your LT1 or LT4 engines. Read about the LT1 block and cams and see pictures of the Edelbrock heads, MSD Ignition, COMP cams, beehive valve springs, and more, inside Popular Hot Rodding Magazine. I’m about ready to put a carburetor on there and call it good. Adjust your Early C4 TPS and Idle Speed by Lars Grimsrud SVE Automotive Restoration Musclecar, Collector & Exotic Auto Repair & Restoration Broomfield, CO Rev. HIGH IDLE Fourth Generation. I have a 92 stock Corvette LT1 and once the engine heats up at idle it will surge from 500 to 1200 rpm at a light while in drive and then sometimes it will stall out. While some cases are less severe than others, a rough idle is usually identifiable by a shaking and bouncing sensation in the vehicle. Basic setting for idle mixture screws is 2 turns open from fully closed for 1966-68, 3 turns for 1969, 1 turn for Holley 2300, Air condition to be ON, except Mark IV and all 1972. 562 114 LSA. Incorrect Idle Speed Car engines are usually made to idle at a standard speed of 1000RPM. The idle jumps around and sometimes has gone up to 1100 or 1200 rpm. The ECM keeps the actual idle speed at the target idle speed by switching the Idle Air Control Valve IACV) ON/OFF to control the intake airflow. This value is the idle in which the car was tuned to idle at, or its desired idle. it has an aftermarket throttle body and the nitrous wires into my tps. Also all 1996+ OBD2 pins are listed, of course, if you have a 1994 or 1995 those pins will be empty. 484/346 exh. Today’s VVT Applications On performance applications, VVT can provide the best of both worlds: good low-end and mid-range torque, fuel economy and increased high RPM power. Introduced in 1970, the LT1 was the most exotic carbureted small-block ever to appear in the Corvette. Discuss 1990 TBI 5. Gm Lt1 Hyd Roller Cam Gen V 262piihr15 Comp Cams 624-500-13. So I take it off, take the sending unit out, thinking somehow the line is plugged. (fast idle control device) valve. The 2014 Corvette Stingray Forum. If the fuel trim comes down chances are you have a vacuum leak. The vacuum screw acts like a vacuum regulator. My old throttle body was worn and air was able to get around the blades even when they were completely closed. If it does than you have a vaccuum leak behind the throttle plate. This is a discussion on High Idle within the General Help forums, part of the LSx Technical Help Section category; So on warm afternoons when I take my 20 min ride home from work, my idle slowly creeps up. the 84 uses an idle air control valve to control idle speed. Increasing spark advance at idle increased fuel efficiency/MPG (by requiring less pulsewidth from the injectors, and less airflow through the MAF sensor), and also lowered engine temperature. No other major mods but the car idles high, between 1100-1500 even when warm. It depends on the RPM at Idle speed your low side apr. Gm Chevy Billet Aluminum Ls1 Lt4 Lt1 Mass Air High Flow Ported Maf Ends Blue. i went over the whole motor for vacuum leaks and found nothin. Holley EFI Base Calibrations Holley provides a variety of base calibrations included with the software. The F-body uses only one sensor. it was better than the lt1 module, would desensitize the knock sensor some. 60 exhaust valves. New 6-15-00 This tech paper will discuss the procedure for correct adjustment of the Minimum Idle Speed and for adjustment of the Throttle Position Switch (TPS) on the early C4 Corvette. Pay attention to low idle or stalling. O'Reilly Auto Parts carries idle air control valves for many vehicles. Topics related to the LT1 engine. 565 111 LSA. By doing this, more heat is pulled out of the combustion area, which, by itself, is a negative, but allowed for higher-than-normal compression ratios without detonation. Signs and Symptoms of a Bad Idle Air Control Sensor by Richard Rowe Connected to the engine's primary air intake valve (the Throttle Body, or TB), the Idle Air Control (IAC) valve is responsible for making minor adjustments to engine airflow. It is mounted with a perfect vacuum beneath the chip so that the air pressure from the other side flexes the chip. Car starts and runs great. We are a trusted name for over 30 years in the remanufacturing of OEM carburetors and fuel injection systems for both the automotive and marine industries. The oscillation is not really fast and again it is random within the range, not a set pattern of increase/decrease. 7s idle at becuase I think mine idles to high for some reason. First post so bear with me. 0 no exceptions Verify that the voltage always returns to the same value at idle!The PCM will idle the engine at a normal speed when the TPS voltage returns to the. com is Sponsored by: LT1 PCM Tuning for Dummies. A code 33 will set if the MAP sensor output voltage is higher than expected (indicating low vacuum) and a code 34 will set if the MAP sensor output voltage is lower than expected (indicating high vacuum). I replaced the idle air valve and has run fine since then. Other info about the troubled carb: The choke is opening all the way when warm. They search their local area (even 100's of miles away) for dyno tuning facilities to unlock the full potential of the engine and they quickly realize there are no shops that are willing or can tune their LT1 PCM. 660 valve springs, hardened pushrods, and AFM. Over the years, I've come to appreciate its power, handling, and reliability. Putting it in gear at that high idle period will cause your tranny to wear out quicker. 96Z28 code P0507 idle too fast car is a 96Z28, auto, headers, The code is P0507 (Idle Control System RPM Higher Than Expected). Lingenfelter Aggressive Idle hydraulic roller camshaft by Competition Cams Ported & polished throttle body High Flow Green Air Filter All necessary gaskets, fluids & bolts Professional assembly & engine installation Custom engine control module reprogramming Chassis dyno testing before & after installation. It was at about 800-900 rpm's in park, and about 600 in drive. 40 and High side at about 150 at 2000 RPM LOW 22 High 230 if high is over 250 there is to much 134A in system at a amibent temp. The settings for one may be totally different than the other. When my LT1 engine get to temp, the idle raise to 100-2500 and oscillate randomly within that range. For the ECM to properly control idle, the throttle stop screw must be set for "minimum air". Read more about C4 Fuel Injection Overview at CC Tech. A feel of smoothness should also contribute. Here are the Symptoms of a Bad Throttle Position Sensor One of the more frequent problems with modern vehicles is a bad throttle position sensor (TPS). My idle is a little high and I need to get it lowered. If the idle air control valve is malfunctioning, it will cause the engine to idle rough, too low, too high, or irregular. PART# 112-509. Available in four different profiles (XFI 262, 266, 270 and 274); the new camshafts are application-specific with designs for street performance. The LT1 is a modern version of Chevy's LT-1 engine, which it used in its first line of Corvettes sold in the 1970s. corvette idle air control valves for all years and models Corvette IAC (idle air control) valve is designed to adjust your Corvette's engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. Signs and Symptoms of a Bad Idle Air Control Sensor by Richard Rowe Connected to the engine's primary air intake valve (the Throttle Body, or TB), the Idle Air Control (IAC) valve is responsible for making minor adjustments to engine airflow. If the count is high, enlarge the hole. IAC valve assembly attaching screws. 7 and L99 4. I replaced the idle air valve and has run fine since then. The settings for one may be totally different than the other. (IAC Test/Cold Idle. Monster LT1-S Clutch with not enough power. Over the years, I've come to appreciate its power, handling, and reliability. thanks guys, i found that cam for 69 bucks haahaha, what a deal, a cam that will idle 800-and rev 7grand, for 69 bucks, and not have lobes go flat and last for thousands of miles, thanks chevrolet!!!! i need a part #and mfg for that gm 140 i will buy one and swap out the lt-1 cam after i have a few thousand miles on the combo and some really good documented performance numbers, not alot of. Very High Idle problem C4 Corvette. Founder and president Art Whipple has always been regarded as a true innovator and enjoyed a very successful racing career as crew chief and owner of Top Fuel Funny Cars and Dragsters, as well as many other forms of racing such as circle and drag boats. Most idle control valves come in the form of a motorized valve or motor that is mounted somewhere on the vehicle’s intake manifold. 660 valve springs, hardened pushrods, and AFM. adjust when engine is warmed up. Increase timing until you stop making more vacuum, then back off two degrees or so for safety. My idle is a little high and I need to get it lowered. I could blip the throttle and get it to drop to normal idle, but the needle would climb slowly back up to the high point. 00 Survivor 1970 Z28 Camaro Lt1 Corvette 350 Carb And Intake 3972110 4555 3972121 9a1 Survivor 1970 Z28. chevy forum at Car Dealer Forums; I have an '86 GMC 1/2 ton pick-up that now has a 5. IDLE AIR CONTROLLER TBI/LT1: Throttle Body Injection IAC, GM 94 and up. RPM = 625 The actual idle RPM which you can see is far less than the Idle RPM or desired idle. This camshaft has a fuel pump lobe. Increasing spark advance at idle increased fuel efficiency/MPG (by requiring less pulsewidth from the injectors, and less airflow through the MAF sensor), and also lowered engine temperature. corvette idle air control valves for all years and models Corvette IAC (idle air control) valve is designed to adjust your Corvette's engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. Start engine & see if it still idles high. I've been frustrated with this for a long time. IDLE TUNING Foreword by Rinkrat456: This article is literally copied and pasted from Krambo's Silverado SS page. About chassis details responsible for road holding,. It is against the law in some states to install, sell, offer for sale or advertise any device, apparatus or mechanism that is intended to alter or modify the original design or. To increase idle rpm the ECM moves the IAC valve out allowing more air to pass by the throttle plate. written by Alex Afrashteh. IAC001) The Dart 200cc Pro 1 LT1 head is a fine example of (6. – 1500-6000 RPM Great low and mid range power with very mild idle and will easily pass emissions. Give yourself more time to let the car idle down before moving. Basic setting for idle mixture screws is 2 turns open from fully closed for 1966-68, 3 turns for 1969, 1 turn for Holley 2300, Air condition to be ON, except Mark IV and all 1972. You may also notice a high idle if the valve is stuck in the open position. There are notes in the Functions column that may say this was only in a F-Body, or B-Body, etc. Everything I am reading says this is too much but if I back it down to 12-14 and about high 30's it doesn't run. The LT1 version costs approximately $35 dollars and you reuse the old sensor. Mine is a 3. The LT1’s (no dash) forged crank and connecting rods are pure hot-rod porn. Lately this LT1 is gotten to be a little hard to start the first time each day. Find great deals on eBay for lt1 air. He found 34° as the ideal spot for idle, for his LT1 with the Hotcam and a full point increase in compression ratio (11. Give yourself more time to let the car idle down before moving. Idle Timing Base Timing. He is an HPTuners member on this site. Re: Tj + Lt1 The stock axles should hold up to mild driving, but that rear end would be a bit weak for an LT1 and 35's if you ever feel like puting the power to the pavementI would say go with an 8. Bumps the idle pressure up ~5 psi and hits 60+ as you hit the higher RPMS. it has an aftermarket throttle body and the nitrous wires into my tps. I took the car on a 50+ mile run down yesterday and had a few problems. By comparison, according to GM’s numbers, a V12 engine from a Ferrari Berlinetta offers 28 percent less torque even though it produces 12 percent more top horsepower. Possible causes are leaking head gasket, intake manifold or TB coolant leak. Research the 1995 Chevrolet Camaro at cars. Most orders placed before 1:30PM eastern time get shipped out on the same day! Secure SSL encrypted shopping! Interested in Net Terms?. 95 trans am LT1/t56/ car will start up just fine, but idle very high. Siemens-80LB-EV1-8. You can run it in until the engine will idle while in park, usually around 1100 RPM. LT1, LT4 Fuel Injector Clinic Injector Set: 8 x 1650cc Saturated / High Impedance Ball & Seat Injectors. (Note: The engine idle speed is controlled by the computer and is NOT adjustable. 95 trans am LT1/t56/ car will start up just fine, but idle very high. 5mm : 1997+ C5, C6, C7. The power is transmitted to the road by the rear wheel drive (RWD) with a 4 speed Manual gearbox. Nicknamed the Mako Shark, the “new” Vette sported refinements like hidden wipers, no vent windows, and T-Tops and removable rear windows on the. The only way I could get the code off was to turn the idle screw down to lower RPM (I know you should not do this), this took care of the problem but my idle. I’m about ready to put a carburetor on there and call it good. The engine was idling very high, around 1500-1800 RPM. Voodoo Cam. Yep, I reset the idle. area of torque off-idle to about 5000 RPM, but one big disadvantage is it’s RPM potential. Typically my car will start fine when it's been sitting overnight. Ecm, distributor, map, plugs, wires, etc have been replaced for other problems. I didn't think I needed the higher volume needed for the DOD engines. The shop has had it now for over a week (two Thursdays ago), and they’ve fixed the couple things that prevented them from putting it on the dyno. Yes, we know a car is a machine made up. LS1/LT1 IDLE AIR CONTROL PIGTAIL (IAC) has been added successfully to your wishlist. IAC001) The Dart 200cc Pro 1 LT1 head is a fine example of (6. First post so bear with me. other two are for high and idle mixture. My idle is a little high and I need to get it lowered. Experiment starting at 25 degrees of idle timing, and check MAP. This switch only allows the nitrous to be activated when you are full throttle. Also unique to the TPI (and 1992–1993 LT1) is the harness connector. Here in lies the problem!. Follow these procedures EXACTLY or you will have to start from scratch. com! We are the oldest and largest V6 Mustang forum on the internet. It passed a inspection and the Smog test before i picked it up. If you have any questions about your V6 Mustang or just want to connect with other V6 Mustang owners around the world, you have found the best place on the internet to do that. The engine was idling very high, around 1500-1800 RPM. According to the dyno chart, the LT4 produces 457 lb-ft of torque just off idle and 625 lb-ft by 2,800 rpm. However, there are many do’s, don’ts, and rules of thumb that can be frustrating to learn the hard way. Yes, we know a car is a machine made up. anyone have any good ideas on where to go with this next? im changing the intake gasket this week but i dont think its gonna solve my issue. When adjusting the idle speed be sure that the idle compensator is closed. Discuss Correct Idle Speed for 5. So it may have overheated when I shut engine off. The LT1 is a modern version of Chevy's LT-1 engine, which it used in its first line of Corvettes sold in the 1970s. With the advances of modern electronics,vehicle manufacturers can now monitor knock and automatically retard ignition timing to eliminate it. If you have any questions about your V6 Mustang or just want to connect with other V6 Mustang owners around the world, you have found the best place on the internet to do that. Search our online idle control valve catalog and find the lowest priced discount auto parts on the web. 650" lift capable Manley Nextek SuperFinished springs this is easily the best 500-600hp capable head available to the LT market. It has an auto trans so sometimes when at a red light I have to stand on the brake so it does not take off. i went over the whole motor for vacuum leaks and found nothin. GM ATK Complete Dress Engines With FITECH EFI. 1963-67 Vehicles Without A. Locate right now. This is done through the vehicle’s computer system and then sends the information to the components. IAC valve assembly. This value is the idle in which the car was tuned to idle at, or its desired idle. Notice Cold Air Intake Tube was loose on the Throttle Body, Mechanic didn't tighten the clamp on it. After doing this to it, it has developed a rough idle. The engine’s healthy idle was the product of a serious performance cam that allowed free breathing through large-port, big-valve heads at high RPM. For GM LT1 applications Bolts to the throttle blade shaft and relays throttle opening/closing information to the ECU Made of high resistance material with a sensitive rotator for accurate throttle position measurement › See more product details. Open loop is used when the O2 sensors are not warmed up, failed, or when an enrichment mode (such as power enrichment) is active. It has very similar idle vacuum characteristics and idle quality as the original Duntov, but unlike the 30-30 cam, it had a broad torque range coupled with excellent top-end power. This happened twice when the engine was warmed up. You would want to do this if you have done any intake modifications. At an idle, engine speed is low, around 600 RPM. Again, start the engine and compare how it is running at a stop to how it normally runs. Injectors flow 170lbs/hr at 58 PSI. Another LT1 Idle Problem. org member Jay_rich for winning December’s Car of the Month, as voted by ThirdGen. To fully extend the IAC, jumper ALDL pins A and B together, and turn the key on, but do not start the car. The picture below is a generic file photo of a Scat crankshaft. LT1, OBD1, M6, high idle issue October 11th, 2009, 11:51 PM I know this is an old problem with 6 speed LT1 cars, but I have yet to find anybody that has an answer. The LT1 is a modern version of Chevy's LT-1 engine, which it used in its first line of Corvettes sold in the 1970s. However, just about all four stroke internal combustion engines (that are street legal) will produce anywhere from 18 to 22 inches of vacuum at idle. OVERLAP Overlap is the angle in crankshaft degrees that both the intake and exhaust valves are open. The pcm uses the MAF to determine the amount of fuel delivery to the engine. Welcome To V6Mustang. We specialize in a wide-variety of high-quality car parts and accessories for your car, truck or SUV. 9a1 4555 3972121 Survivor Intake 350 Corvette And Carb 3972110 Lt1 1970 Z28 Camaro 350 Lt1 Z28 1970 3972121 Camaro Carb Corvette 3972110 And 4555 Intake 9a1 Survivor. The sensor resides on the RH side (passenger) of the engine block, in the coolant drain location. Flow Rate in CC per minute: 840 CC/min @ 43. This cam is a "torque monste. high idle My camaro when cold the warmup is around 900 but sometimes the idle surges and it will warm up at 1,500-2,000 rpm. IAC valve assembly attaching screws. It has a real rough shaking to the idle like a miss or something. If it is set to give for example, 5 in. I just wait until the idle drops below the 1k mark then put it in gear. LJ verified/sanity checked the timing too. AIP Electronics Inc. The first is the wide-open-throttle switch. Just had it professionally rebuilt.