If the engine gets good and hot the idle speed will come down to almost. I guess I had a vac leak somewhere in the throttle body or in the gasket underneath the throttle body. Below you will find the most complete list of Chevy trouble codes available. Over the years the idle speed has very gradually increased. Ok this has been going on for some time now. Thing isn't real cheap so we save changing it until last. ***THIS ITEM HAS A $450. Reader Question Hello My name is Martin I have a 1993 Chevy Silverado 1500 Pick up V8 350. System is going lean, and after 20-30 seconds of running lean, then goes into open loop forever. If you are experiencing a car idle rough and an RPM high, then there are a variety of reasons for why this could be happening. Just to recap, my rig would idle at 1700 ish even after it was up to temperature. When I'm walking to the car, it is idling so high it sounds like the motor is racing. After driving and coming up to operating temperature, when I come to a stop and the truck is at idle in gear it will be back to normal around 600 RPM. This product is made of high-quality materials to serve you for years to come. I have holes in the exhaust and no cat from previous owner, so it's noisy and does smell like exhaust at times in the cab, so I didn't think much of it. I can feel that thing chattering while the engine is running. it control's idle. My problem is that the engine wants to surge at low rpm's. Need to replace your Chevy Idle Air Control (IAC) Valve? Then shop at 1A Auto for a Idle Air Control Valve replacement for your Chevy at a great price. it control's idle. I have a 1989 chevy 4. Over or under can cause problems. When it goes in drive its fine. 00 trying to find the problem for this. I cleand the throttle body with crc throttle body and intake cleaner. Engine is a TBI 454 7. the vehicle fell into a high idle syndrome of. 6L Duramax 3/4 1 ton. For some time Ive been asking for advice how to resolve a high idle problem with my 90 Reatta (to be referred as Reatta #1). Originally it had a 305 engine and in 93 my. Rough idling can also be caused by bad motor mounts, an engine misfire, incorrect ignition or valve timing of even bad tune up parts. when the engine's hot there's no need to idle it as fast. I have taken it to a half a dozen mechanics, promising me that they could find the problem. 3L Very High Idle Posted to GM Driveability on 11/3/2008 8 Replies this truck came in with a P0121 code (throttle position correlation problem),so we changed the throttle body,we got a new unit from the dealership,now the problem we are experiencing is that the idle is very high (2800 rpm) and some times it. We are more than happy to help you figure out why a shop wants to charge you for a repair, and we will tell you if it is unusually high. Cranks up fine and hits the high idle point, but instead of falling on it's face for a second, it drops down to 650 RPMS, the same RPM it would be sitting at when warm. I need help. RPM's still seem high driving, but lower than before. " - Sherlock Holmes. 1997 Chevy K2500HD Ext/SB 6. Welcome to the Chevy Check Engine Light codes page. 7L) engines. IF A RE-BUILDABLE CORE IS SENT BACK, YOU WILL BE REFUNDED $450. High output alternators produce more power for vehicles demanding more energy usage. 3 Vortec, Leaking Fuel Injection System 93 Chevy Blazer, Running Lean 93 Chevy Cavalier, Fatal Fluids? 93 Chevy Corsica, ABS Problems 93 Chevy Lumina, Brake Woes and Support Groups 93 Chevy Silverado, Fan Only Works on High. What is the normal (expected) idle under normal weather conditions. I have a 96 1500 5. 93 Chevy truck will not idle down? check the ait. If your idle is too high (i'm guessing. Hello, My question is what could cause a high idle? I have a 95 Chevy pickup 4x4 with a 5. See what others are asking about their. Chevy S10 low idle. Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > OEM Issues: Anyone have trouble with the high idle / throttle not backing off?. Both conditions can cause a P0171 lean code, rough or unstable idle and sometimes even a stalling condition. Please read the sticky post on the subject for details. Rough idle for 93 chevy blazer 1500 I have a 93 1500 blazer that is idleing rough when engine is warm. The ECU sets the car at a relatively high idle just to warm it up more quickly, and as the coolant temperature rises enough to become adequate, the engine does slow down somewhat into an idle around 650-800rpm. I've noticed a few times now when it is really cold, my car will idle at around 1200-1300 rpm for extended amounts of time. For 87-95 Chevy GM 350 efi tbi tpi High Performance Billet Ignition Distributors (Fits: 1993. For some time Ive been asking for advice how to resolve a high idle problem with my 90 Reatta (to be referred as Reatta #1). I have a 93 Silverado 1500 5. Here are the symptoms. I am assuming your carb has an electric choke. The idle air control valve for Chevy C1500 controls the air going into the engine. The motor shut down, and everytime we went to start it there would be a loud whining/spinning noise. 5-2006 Chevy/GM LLY Duramax Diesel equipped 2500 & 3500 trucks, by PPE. I have it set 10°btdc the idles at 650 rpm and I set the air fuel screws at the highest vac at 15hg but all seems to idle high and run rich, what am I doing wrong here what else can I do?. What complicates a rough idle/misfire condition is having the PCM not register any specific misfire codes. Please read the sticky post on the subject for details. Make sure its engine receives appropriate amounts of fuel and air with the purchase and installation of a new Chevrolet K1500 idle air control valve from AutoZone. I think my Blazer idles too high even in the summer days. Symptoms of a failing idle air control valve include stalling, stumbling, high or increasing idle speeds. I have a nasty high idle in my 95 chevy s10. 7 liter with 260'000 miles on it. The motor shut down, and everytime we went to start it there would be a loud whining/spinning noise. Correct Timing. A common complaint with the Chevy 4. Examples of this are staling, lurching and poor acceleration. This is a discussion on [SOLVED] extream high idle problem on 1990 chevy 1500, 4. Chevy Check Engine Light Codes. What complicates a rough idle/misfire condition is having the PCM not register any specific misfire codes. A dealer may encounter a customer concern of an intermittent high idle. I have driven both 1. To summarize, the solutions for a lazy / slow return to idle (or erratically high idle) are: Eliminate vacuum leaks; Perfect ignition. I have a 99 Chevy suburban k1500 5. And when i give it good shots of gas its almost as if the throttle sticks for 2-3 seconds. 7L 350 V8 in the alt. It involves two things. Any help would be greatly appreciated. After the job was done, I noticed that in Park or Neutral the idle went up from 900-1000 rpm to almost 2000 rpm. I bought the truck recently and have begun working on it. I rebuilt my throttle body with a kit from Ebay and it cured both problems. 3 is having idle issues. by Kyle McFadden. P0118: Engine Coolant Temperature (ECT) Circuit High Input. I found that putting low grade gas in car mad it idle high. My work truck, 08 K1500 with the 5. Oncr the engine is warmed up and the idle flips higher, the idle stays above 1100rpm until it's been off for a good while. Next, you can have a bad IAC (idle air control) valve on the side of the throttle body. Part numbers 1110018, 1110020, & 1110022. System is going lean, and after 20-30 seconds of running lean, then goes into open loop forever. I've got a 2002 Chevy Impala with a 3. Any help would be greatly appreciated. One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. 2001 - 2003 6. - You are sure to find the right alternator for your high electrical load needs. factory cruise control * mittie m. This computer regulates idle speeds. Everything has to be on-spec for proper performance. Consider CARiD. Some causes are harmless, while others can indicate the need for a repair. I figured this might be a vacuum leak but im not sure sure how to check if it is and where to look(how to find the leak). This is what I have done to date: Replaced IAC, MAF, TPS, Fuel pressure regulator, PVC valve. I do agree that the high idle speed would be explained by a vacuum leak, however, the following would also need explanation (which is why this issue is so damn vexing): 1. Such as clean out the Intake. These idle up speeds may occur with no input from the customer. I guess I had a vac leak somewhere in the throttle body or in the gasket underneath the throttle body. I cleand the throttle body with crc throttle body and intake cleaner. What is causing my 1993 Chevy truck to have a high idle? It is setting a code for an IAC, which I replaced. yes all stock expept K&N that ive had for a year no problem ok took it to a mechanic hooked up cumputer downloaded latest software reflashed and still same problem all he could tell me is keep using it but its been a week already y already made a 300 mile trip no problems expept for the high idle its getting frustrating not being able to brake properly and extra stress on the tranny. It is still idling high and setting a code for the IAC, even with the replacement. 7 4wheel drive. Just to recap, my rig would idle at 1700 ish even after it was up to temperature. System is going lean, and after 20-30 seconds of running lean, then goes into open loop forever. With my '93 the engine will idle high until it's warmed up. I've got a 2002 Chevy Impala with a 3. ) The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Difficulty Scale: 4 of 10. I have even seen PCM updates fix a rough idling condition as well. The motor dies while moving at idle speeds mostly while making a turn. I noticed while sitting in park the voltage meter drops and the engine pulls way down. Having trouble passing smog--very high HC at idle (1139 ppm, standard is 175 ppm). 6l lb7 duramax diesel with. When it started I figured it was a vacuum leak. These idle up speeds may occur with no input from the customer. 2 died; 1996 3. The number one cause for high idle is an imbalance in air pressure. The timing connector for the Chevy Silverado breaks out of the engine wiring harness conduit adjacent to the distributor. Welcome to the Blazer Forum - Chevy Blazer Forums. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. It also might not start at all at the gas station. 0L) and LO5 (5. In gear, with my foot on the brake, the idle would surge from 600-900, maybe a 2 second cycle. G-VAN / GMT610 LGH IDLE SPEEDS. If this is your first visit, be sure to check out the FAQ by clicking the link above. 7 4wheel drive. What is the idle air control valve pintle length adjustment on a 1993 chevy S10 blazer w/ 4. New Holley 4150 Idle Too High I have the idle mixture screws only 1/2 turn out, and I backed the high idle screw on the electric choke almost all the way out. please read all of the instructions before proceding. SYMPTOM SUMMARY The engine idles too high. I hadn't stopped long at any stop signs, but it seemed symptom free. 7 Recently the lower radiator hose fell came off the radiator, dumping the liquids all over the street. I would just use the gas pedal to keep the revs up until warm when I could. Chevy Check Engine Light Codes. Unfortunately, these variables are all inter-related. This time, I. 3 is having idle issues. just bought a 1992 f150 xlt 4x2 5. 00*** This engine was designed to be a performance upgrade for LS based vehicles or perfect for a 2001-2007 Chevy Truck LQ4 or LS swap in a hot rod. on yhe left side of carb. I bought a 1990 Chevy 1500 pickup several months back. Since you have the 1. 0 Resto Idle Air Control Adjuster This 5. I'm still having this problem is there anything I missed. Expect big mid to upper end power, will have a noticeable idle. Adjust Idle. Surging idle can be caused by a number of different problems. That should help with the high idle. "I have a 2003 chevy silverado with the 4. Ok guys, I have a problem and am looking for help/advice. 0L) and LO5 (5. What is the normal (expected) idle under normal weather conditions. Trouble with the valve lead to issues with the amount of fuel going to the engine, which, in turn, causes problems with idling and irregular deceleration. dragosljvich. It was just doing it while in gear at stoplights, but now does it while idling in park. I've noticed that my sonic's idle is rough when I first start it for the day. Oncr the engine is warmed up and the idle flips higher, the idle stays above 1100rpm until it's been off for a good while. We strive to be the best high amp alternator supplier period. Chevy Numbers Decoding; High idle in park, stalls in drive!!! would cause verry high idle but no power to keep running under light load. you can remove it can clean with WATER ONLY. Noticed the timing @ idle according to the scanner is 16 degrees. Runs great as mentioned. Working on the rough idle problem When we were in town yesterday I purchased a new PCV valve for the van's engine. For 87-95 Chevy GM 350 efi tbi tpi High Performance Billet Ignition Distributors (Fits: 1993. I need help. " Reply: "There is a service bulletin for that problem on your vehicle. I found that putting low grade gas in car mad it idle high. The answer to that question depends on the cause of the high idle. Everything has to be on-spec for proper performance. I have holes in the exhaust and no cat from previous owner, so it's noisy and does smell like exhaust at times in the cab, so I didn't think much of it. No that idle issues is not normal. Took it for a fairly long start-and-go jaunt. Ok, more to the topic. Irregular idle speed. New Holley 4150 Idle Too High I have the idle mixture screws only 1/2 turn out, and I backed the high idle screw on the electric choke almost all the way out. '91 Chevy 350 TBI surging at idle and stumbling at speed Howdy - My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. I have a nasty high idle in my 95 chevy s10. hi i have a chevy 350 in my 72 chevelle engine has been overhauled but the idle is too high like around 2000 to 3000. So I checked the vacuum hoses and also the vacuum hard lines they seemed to be ok. 3 is having idle issues. 4L idles @3,000 rpm. 00 CORE CHARGE BUILT INTO IT. The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there?. If the idle is low and inconsistent, it may be due to an issue with your idle control valve. When the engine is cold the idle speed is way too high. Symptoms of a failing idle air control valve include stalling, stumbling, high or increasing idle speeds. factory cruise control * mittie m. Welcome to the Blazer Forum - Chevy Blazer Forums. Trouble with the valve lead to issues with the amount of fuel going to the engine, which, in turn, causes problems with idling and irregular deceleration. Last Sunday & Monday, I took out my seldo. When it comes to Chevy Silverado accessories, we've got it ALL - billet grilles, wood dash kits, floor mats, tonneau covers, bed rails, chrome trim, and other Silverado upgrades. 5-2006 Chevy/GM LLY Duramax Diesel equipped 2500 & 3500 trucks, by PPE. Once it warms up to normal operating temperature, it revs higher at idle. However, armed with a test report indicating what gases are high can help you determine what systems may not be functional. With my '93 the engine will idle high until it's warmed up. 7 Idle surging,stalling in the alt. For some time Ive been asking for advice how to resolve a high idle problem with my 90 Reatta (to be referred as Reatta #1). After about 5 seconds it got it's first fart in the idle. I do have the 3-volume GM 1995 C/K Service Manual and have read through a lot of emissions-related posts on this site but have not identified the problem(s) yet. to turn on the high idle you must run a wire to the ecm /www. This was after it first happened. Welcome to the Blazer Forum - Chevy Blazer Forums. Below are the top 5 causes that a mechanic would look for. Usually a bad or failing idle control valve will produce a few symptoms that can alert the driver of a potential issue. Also checked all my accessories and there's no difference with those plugged so I think a leak is probably somewhere else. If you recall, Ive changed various sensors, IAC, thermostat, cleaned the injectors, PCV valve, kitchen sink - the list goes on. I recommend to remove the idle air control valve from the throttle body, clean it, and also clean the throttle plate. - You are sure to find the right alternator for your high electrical load needs. Idle Rough and RPM High Causes. We have over lots of customer reviews on Chevy Idle Solenoid to help you find exactly what you need. Does it every time Windshields from 83-94 S-model Blazer/Jimmy and 83-93 S10/S15's are all the same. Runs great as mentioned. The ECU sets the car at a relatively high idle just to warm it up more quickly, and as the coolant temperature rises enough to become adequate, the engine does slow down somewhat into an idle around 650-800rpm. Over or under can cause problems. Only when its in park or neutral. 2007 Chevy Equinox Automatic, AWD 120,000 miles. chevy forum at Car Dealer Forums; I have an '86 GMC 1/2 ton pick-up that now has a 5. I tihnk the kit cost me $35 or something and the truck ran alot better afterward. Ran across this old post of mine and figured I should wrap it up. Irregular idle speed. 7L 95 Suburban continues to have a high idle (about 1100 RPMs). If when you remove the fuse the surging up and down goes away when applying the brake but the truck still idles high then the problem is probably the idle air controll valve. Chevrolet Silverado owners have reported 18 problems related to engine clicking and tapping noises (under the engine and engine cooling category). Trouble with the valve lead to issues with the amount of fuel going to the engine, which, in turn, causes problems with idling and irregular deceleration. 7L) engines. Spray WD40 on the throttle springs and butterfly pivots. The most recently reported issues are listed below. I just took my upper intake off to replace my fuel pressure regulator, put everything back together, and now, I have an extremely high idle. "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. Ok this has been going on for some time now. Engine is a TBI 454 7. The engine will rev up and down trying to find the proper idle speed. I brought my Equinox into the shop a couple of weeks ago for a couple of issues. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Any help would be greatly appreciated. Seriously though, what you are describing is pretty 'normal' behaviour for the 3. 3 vortec engine? trouble code 35 keeps coming on at a idle and the idle stays high then drops as i come to a stop. 3 v6 TBI within the Automotive Support forums, part of the Tech Support Forum category. Oncr the engine is warmed up and the idle flips higher, the idle stays above 1100rpm until it's been off for a good while. DIAGNOSIS Diagnosis of high emissions can be an involved process that usually requires special tools and measuring equipment. What is the normal (expected) idle under normal weather conditions. When it started I figured it was a vacuum leak. Correct Timing. I bought the truck recently and have begun working on it. factory cruise control * mittie m. my truck does something similar. I have a nasty high idle in my 95 chevy s10. it has a 600 cfm edelbrock carb but when i adjust the idle screw down the engine shuts off. 1 surging issue; How do. You may have to register before you can post: click the register link above to proceed. i have misted around the intake with starting fluid with no change as if a vaccum leak would turn up. I can feel that thing chattering while the engine is running. Then a few more, and a few. 92 Chevy Lumina Z-34, Learning to Idle 92 Chevy Silverado, Starter Problem? 93 Chevy Blazer 4. I finally scanned my blazer, and got DTC-35, Idle Air Control It has been starting fine, and for a while now, when I am in park, or stopped at a light for a while, the check engine light comes on. Beginning in 1985, some engines were available with a throttle body fuel injection system. 1 mph for uniform application. Our knowledge and expertise cannot be matched. This code indicates that the PCM is seeing a high voltage drop across the ECT sensor, which it's translating as an extremely hot coolant condition. fast idle installation instructions for lb7 duramax. Cranks up fine and hits the high idle point, but instead of falling on it's face for a second, it drops down to 650 RPMS, the same RPM it would be sitting at when warm. DIY High Idle using the Stock Cruise Control Servo. ok i just put a chevy 400 sb in my truck and got it running the problem is it idles at 1400-1500 rpm and i cant get it to come down at all. If you recall, Ive changed various sensors, IAC, thermostat, cleaned the injectors, PCV valve, kitchen sink - the list goes on. A common complaint with the Chevy 4. I think my Blazer idles too high even in the summer days. 20 minutes roll by and it is still stuck at this high idle, I adjusted the idle mixture screws and even the screw that controls the carburetors idle speed when it is warm on the 1406 and it did absolutely. Unfortunately, these variables are all inter-related. The current readings are about 1000-1100rpm cold and 600-700rpm warm. I do agree that the high idle speed would be explained by a vacuum leak, however, the following would also need explanation (which is why this issue is so damn vexing): 1. I'm getting a high idle on the Vortec 350 in my Cruiser. Average failure mileage is 154,800 miles. Chevy Express P0496 Symptoms. At this point I have ran out of daylight to work on it but I don't know where I should start tomorrow. Poor idling and loud engines usually go hand-in-hand. Having trouble passing smog--very high HC at idle (1139 ppm, standard is 175 ppm). I figured because one of our road tractors has a cruise control and u could idle it up when parked. Trouble with the valve lead to issues with the amount of fuel going to the engine, which, in turn, causes problems with idling and irregular deceleration. Over or under can cause problems. I have driven both 1. The ECM increases the idle speed using the following adjustments: The fuel injection timing is changed. The timing connector for the Chevy Silverado breaks out of the engine wiring harness conduit adjacent to the distributor. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. Consider CARiD. Sounds like there is also a fast idle valve that you can adjust. They have saved me in the past. Idle air control valves open to allow more air to "leak" into the intake, raising the engine rpms, or close when not needed. Welcome to the Chevy Check Engine Light codes page. I get a P0507 DTC. My 90 sidekick idles HIGH HIGH HIGH on a cold start! I really hope someone can help on cold start it revs to 2500 rpm then kicks down to around 2000 rpm for quite some time until warmed up. High Idle Kit, LB7, 2001-2004 Duramax 10457 High Idle Kit, LB7, 2001-2004 Duramax Full manual control of the elevated idle on your Duramax truck is possible with our High Idle Kit. " Reply: "There is a service bulletin for that problem on your vehicle. the vehicle fell into a high idle syndrome of. Average failure mileage is 154,800 miles. i was just wondering if there was. If the engine gets good and hot the idle speed will come down to almost. my truck does something similar. Chevy Blazer idle is too low, then when come to a stop is very high for a few seconds. Whether you have a Chevrolet Suburban, Blazer, Camaro, etc. High Idle Speed (Bohdan Bodnar) Abnormally high idle implies a cracked/open vacuum hose to the MAP sensor. Unfortunately, these variables are all inter-related. One thing you could do is check your spark plug gap. High idles may be commanded by the ECM for certain battery charging electrical loads or diesel particulate filter cleaning processes. Idle Problems With Performance Camshaft I have read almost every article and threads on the Internet about this problem, but haven't found a working solution for my setup. The ECM increases the idle speed using the following adjustments: The fuel injection timing is changed. The idle air control valve for Chevy C1500 controls the air going into the engine. It has finally become too annoying. Chevrolet Silverado owners have reported 18 problems related to engine clicking and tapping noises (under the engine and engine cooling category). P0507 Chevrolet Description The Idle Air Control (IAC) valve is a Powertrain Control Module controlled stepper motor located on the throttle body. ok i just put a chevy 400 sb in my truck and got it running the problem is it idles at 1400-1500 rpm and i cant get it to come down at all. After 2 years and having the burb at 2 different shops with no result to the surging idle, I stumbled upon the answer at a Ford site. Hello, hows everyone? lol. The engine has started to idle very high. So I checked the vacuum hoses and also the vacuum hard lines they seemed to be ok. Irregular idle speed. High Idle Control - 2006-2007 Chevy Duramax LBZ. (Note: The engine idle speed is controlled by the computer and is NOT adjustable. 1997 Chevy K2500HD Ext/SB 6. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. The motor shut down, and everytime we went to start it there would be a loud whining/spinning noise. I guess I had a vac leak somewhere in the throttle body or in the gasket underneath the throttle body. The motor dies while moving at idle speeds mostly while making a turn. How the cruise control servo works: Pin 4 (black) is permanently grounded. I rebuilt my throttle body with a kit from Ebay and it cured both problems. Just idles so darn high when cold, shifting gets messed up and wastes lots of gas. Please try again later. I can feel that thing chattering while the engine is running. when truck engages "drive" it idles around 1000- 1500. I would check the Idle Air Control Valve (IACV), having it cleaned may resolve your issue. The High Idle switch eliminates the use of another person stepping on the accelerator such as in the case of trying to jump start another vehicle. I have an ongoing idle issue I need assistance with, I should probably say that idle issues seem to be a problem with these cars, but so far all the tips I've tried have failed my dad was a GM mechanic so I learned. Over the years the idle speed has very gradually increased. Though again, it is normal for cars to experience high idle until it reaches operating temperature. Hi i am new to this forum and in desperate need of advice. Recently I've been experiencing a high idle problem. Started it, ran fine, no idle disruption.