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Working on a 06 chevy with a 6.0, it misses on cylinder 2 and 7 at an idle 6-700rpm but not at 1000rpm. New spark plugs, wires are good even switched them and didn't change anything, checked coil packs and switched them around no change, then even put in new injectors still the same. Used carb... The misfire occurs during idle and low to medium rpm load, but not during WOT. It feels like shaking and sputtering. Plugs have been gapped at .54, .56, and .60 with similar if not identical results. They are currently at .54. The plugs have been replaced three times. The first time I replaced them, the misfire was gone and the car performed ... If a coil pack goes bad, it'll cause a misfire and rough idle condition. Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires - While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado ...Apr 22, 2019 · 2008 Chevy Silverado 5.3 misfire only at idle on #2. Power/Fuel. ChevySilveradoLtd. April 22, 2019, 12:12pm #1. It runs great going down the road but if I stop at a ... FIXED! 1998 chevy k1500 5.7 vortec misfire × Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly ...
If a scan tool is not available, connect an ohm meter to the top and center FIPL terminals and adjust to 1800 ohms +/- 50 ohms. You can check the adjustment of the FIPL by back-probing the center wire of the FIPL sensor connector with a digital volt meter. The voltage should read 1.0-1.1 volts at idle, 1.6-1.9 at 30 MPH, and 2.0-2.5 at 55 MPH. manifold vacuum at idle) to above the throttle plate, where it saw no manifold vacuum at all at idle. This meant the vacuum advance was inoperative at idle (retarding spark timing from its optimum value), and these applications also had VERY low initial static timing (usually 4 degrees or less, and some actually were set at 2 degrees AFTER TDC). Complaint is a random misfire at idle, especially when cold. We duplicated it as an occasional ignition (type) miss, a big hit / stumble at idle from time to time. There was a general misfire (P0300) set, but the freeze frame shows it set at a higher rpm. Trailblazer (Envoy, Bravada) idling issue, even worse when turning on the AC, the car would just completely shut off. Would go below 500 RPM. Simple solution... Possible symptoms of a faulty TP sensor include hesitation or stumble on acceleration or tip in, a dead spot in the throttle, rough idle or check engine light with related codes. Some older style throttle position sensor are adjustable, but most newer style sensors are fixed position.

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Vehicle is a 2007 Dodge Nitro R/T with a 4.0L engine. I've had a lot of trouble diagnosing a cylinder 2 misfire and looking for help on next steps. Symptoms. After engine is warm, stop and go traffic will result in a rough idle and repeated engine light warnings for cylinder 2 misfire, P0302. Steps Taken One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off.The most popular street carburetor in the hot rod world is probably the 600-cfm Holley vacuum secondary carburetor, otherwise known as the 0-1850. We show you the best applications for this ... Jul 01, 2004 · A lean fuel mixture (too little fuel for the amount of air in the cylinder) can cause an engine to have a surge or miss at idle and part throttle, stumble on acceleration, engine overheating ... Diagnosing an Engine Misfire. In this specific case, my 2004 Nissan Titan would almost stall at idle, there was some hesitation when accelerating, and I could feel some vibration from the engine intermittently. All of these symptoms could be attributed to an engine misfire, so when the check engine light came on, it wasn’t a huge surprise. I have a 71 Chevy Nova with a 350 motor. It has been running great until a couple of weeks ago. My motor seems to be missing/backfiring once it warms up (about 10 minutes) and I go from an idle to accelerate. It seems to be an ignition problem. I have checked my timing when warm, and when I am at idle, the timing is varying plus minus 4 or 5 ... cam fitted. Below is a table of advance requirements and expected idle speeds for a range of cam specifications. ON NO ACCOUNT use these settings before the maximum advance on the distributor has been correctly limited. Cam duration Advance Idle speed expected 270 10-12 600-800 280 12-14 900-1000 290 14-16 1000-1100 300 16-18 1100-1200 Couldn't get it to miss, but at some point, i did set codes p1241 and p1226, which are injector 2 and 7 output circuit codes. Whether this is related or not is a good question. Also noticed that when i blip the throttle to get it running poorly, the balance rates all show zero. Re: Random misfire at idle Apr 03 2012, 8:11pm i have a similar problem with my 2002 chevy silverado 2500 hd 6.0 l but it occurs when i accerlate from a full stop. i have noticed it more in colder weather but i was told it could be my egr valve . what are you thoughts

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manifold vacuum at idle) to above the throttle plate, where it saw no manifold vacuum at all at idle. This meant the vacuum advance was inoperative at idle (retarding spark timing from its optimum value), and these applications also had VERY low initial static timing (usually 4 degrees or less, and some actually were set at 2 degrees AFTER TDC). Jun 09, 2017 · An engine with a vacuum leak can run at a higher than commanded idle speed and will tend to idle erratically. So make sure all of the intake manifold and throttle body bolts are tight and there is no uncovered vacuum port. Apr 21, 2015 · When driving a vehicle with a small vacuum leak, you will notice that everything feels normal at higher speed or RPM, but runs rough when the engine is at an idle. The engine could seem to rev up and down on its own at idle, but it’s more likely that it will simply rev up abnormally and stay there at idle. Why Does a Car Misfire When in Idle? By Staff Writer Last Updated Mar 28, 2020 10:55:14 AM ET. Robert Couse-Baker/CC-BY 2.0. There are a number of reasons why an engine might misfire while it is idling. Usually misfires occur when there is no spark, the air/fuel mixture is out of balance or the engine is losing compression.my 2006 trailblazer has “random-multiple misfiring cylinders”, #5 cylinder misfire, and one other code with something to do with pccm i think. i had one code the other day for cam sensor, so i replaced that and everything seemed fine until the next morning the other codes popped up and now the car stalls everytime i stop at a light and takes a few tries to start up. i just replaced the ... May 07, 2015 · Sitting idle leads to phase separation in ethanol blend fuel, which makes the fuel extremely aggressive to rubber, and by absorbing moisture from the air can rust up your tank, too. Thinking it might possibly be a lean miss as opposed to a spark miss? Just a WAG, actually. NTFDAY and glennsexton like this.

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1997 LX450 121K miles I have a slight miss at idle. This seems to be the only point where the miss is noticeable. The engine is smooth at RPM’s above idle and my fuel economy is right on target. All the tune-up items have been changed with Toyota parts minus the fuel filter and O2 sensors... Dec 23, 2020 · Original review: Sept. 24, 2020. I financed my 2015 Chevy Malibu LT new in April 2015, it has a-little over 85,000 miles currently and started to act up!

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If you car is overheating at idle, but it’s fine the rest of the time, then there are a handful of different problems that you might be dealing with. The most likely reason for this type of problem is that your fan isn’t working, but the reason, and the fix, will differ depending on the car you drive. If you have a Quadrajet that is very rich at idle, no matter what you do, check for a warped air horn. If a replacement is not offered, a machine shop can mill the part to correct the problem. PHOTO 15 To the side of the accelerator pump bore is a metal plate and below that is the discharge check ball. Learn more about the 2005 GMC Yukon. Get 2005 GMC Yukon values, consumer reviews, safety ratings, and find cars for sale near you. The idle speed came back down to the 850 rpm and 1300 rpm numbers which was better however, I still had the cylinder #1 misfire! At this point I was out of tricks. I swallowed my pride and took the vehicle to the Chrysler garage.

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Chevy 1965-1969; Chevy 1970-1974; Chevy 1975-1979; Chevy 1980-1989; ... Fast idle cams, idle speed adjuster; Float Pins, bowl inserts; Hangers, secondary rods . Used ... - No misfire temporary (pending) or matured fault present. - A/C clutch, PS Switch and Cooling fans do not change state (turn off). Driving Procedure 1) Idle vehicle for five (5) minutes (to reach closed loop operation). 2) Drive with a steady vehicle speed between 40 & 60 mph for 2 minutes. 3) Idle vehicle for three (3) minutes. For example, if LTFT B1 is 25% at idle but corrects to 4% at both 1500 and 2500 rpm, your diagnosis should focus on factors that can cause a lean condition at idle, such as a vacuum leak. If the condition exists in all rpm ranges, the cause is more likely to be fuel supply-related, such as a bad fuel pump, restricted injectors, etc. How to repair P0304 code Cylinder 4 Misfire Detected. What is the cost to diagnose the P0304 code Labor: 1.0 The cost to diagnose the P0304 code is 1.0 hour of labor. Apr 19, 2011 · Hey guys, I have a bone stock 2004.5 duramax. Sometimes it has a really rough idle. I can only notice it when its in gear and i am at a stop. I can hear the engine "laboring" at one spot and it lunges forward at that exact spot. Diagnosing an Engine Misfire Download PDF. My name is David Gorth and I recently experienced an engine misfire problem which may be of interest to some of the AutoTap users. To make a long story short, the PCM on my 1997 Chrysler Intrepid, 3.5L V6, reported a P0301 code through the AutoTap, which indicated a cylinder number 1 misfire. I have a 71 Chevy Nova with a 350 motor. It has been running great until a couple of weeks ago. My motor seems to be missing/backfiring once it warms up (about 10 minutes) and I go from an idle to accelerate. It seems to be an ignition problem. I have checked my timing when warm, and when I am at idle, the timing is varying plus minus 4 or 5 ... Aug 02, 2017 · Idle mixture adjustment: Adjust idle mixture screws to lean best idle. Repeat the operation on 2 and 4V carburetors. Now, turn mixture screws in until idle speed drops 25 RPM on tachometer. Idle speed setting. Re-set idle speed per instructions on decal in engine compartment. Check solenoid operation. Misfire and Broken Distributor Wires. [Symptoms: Misfire is very pronounced under heavy throttle -- think of a mechanical bull -- which leads me to suspect something in boost control. But the tach also shows about 150 RPM variation at idle, which hints that the misfire exists under no load conditions.] I had this happen to my 85 as well. If the valve is working properly, you should hear a hissing noise from the valve with the engine running at idle. Put your finger over the valve and you should feel a strong vacuum. If that's OK, then you're onto the air flow meter. The air flow meter is a hot wire type.

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Since you have a calibration map (Scanner) see what the Throttle Angle is at idle, then depress the throttle fully and see if you get a 90 degree reading. You should get no more than about 6...May 12, 2014 · hey, I have a 1995 chevy 1500 with a 4.3 tbi engine, the truck picked up a terrible misfire at idle it does it in park and drive it almost feels like a dead cylinder truck lurches real bad,etc. but it will rev up fine and runs fine once you get past 1000rpms but it will sputter slightly when you... Fast-idle mechanism: The fast idle is controlled by a stepped cam and usually employs a fast-idle screw that keeps the throttle opened when choke spring tension is created. Some applications did not use a dedicated fast-idle screw and instead had the curb idle speed screw ride against the cam. Aug 02, 2017 · Idle mixture adjustment: Adjust idle mixture screws to lean best idle. Repeat the operation on 2 and 4V carburetors. Now, turn mixture screws in until idle speed drops 25 RPM on tachometer. Idle speed setting. Re-set idle speed per instructions on decal in engine compartment. Check solenoid operation. At idle, the valve blocks a small amount of air from entering the engine, keeping idle RPM's low. Once you begin to use the accelerator, it opens up allowing full air flow. Over time, from the large volumes of air that pass through it, the valve can get gunked or clogged up and being to function poorly, creating idle issues.

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