Question about 1998 Pontiac Bonneville

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Random misfire idle down stall out and restart and drive normal what causes it?

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  • Pontiac Master
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If you have a crankshaft sensor going bad, that could be it. have a parts store retrieve a trouble code, from computer, your service engine soon light came on, yes ? egr valve can cause this, spark plug wires might cause this, check distributor cap/rotor, old spark plug wires can cross fire because of shorting out. see how that works

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

  • 93 Answers

SOURCE: 1997 Bonneville - Engine light code P0303

the code you have is for a misfire on #3 cylinder. (im sure you knew this right?). the crankshaft position sensor will not cause one individual cylinder to misfire. what i typicaly do in this scenario is switch the ignition wire off of the guilty cylinder onto a known good firing cylinder and see if misfire moves to the other cylinder. i repeat this process by switching the spark plug and finaly the fuel injector. a compression check may be in order as well (but not a likely cause) unless you have access to a tech 2 (gms diag computer) you will need to clear this code after each component is moved and see if you get a new code ie :p0304 if switched to #4 cylinder..other wise if you do have access to a computer that has a misfire chart in its features you can quickly identify the guilty component. as i side note the ignition coil may also be faulty, but i believe your vehicle has a 3.8liter meaning that it has a coil pack....switch the others i listed and see ow you make out....good luck!

Posted on Jun 11, 2009

  • 84 Answers

SOURCE: 2000 pontiac sunfire misfire

Solution is in the wiring harness....these cars are noted for this as it runs under the rad exposing it to the elements and corrosion. You will need a dealer with the proper scanner to read the code & find the wire.

Posted on Dec 31, 2009

  • 14036 Answers

SOURCE: 98 Grand Am GT 3.1 engine Very high idle when

MASS AIR FLOW CAN CAUSE PROBLEMS IF ITS DIRTY OR SKEWED .YOUR IDLE AIR INLET PASSAGES OR THROTTLE BORE IS DIRTY OR FULL OF DEPOSITS.BESURE REPLACE EGR VALVE GASKET THE OLD GASKET WILL LEAK.CHECK FOR THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.

Posted on Dec 30, 2010

Testimonial: "THANKS. Going to pull it in the shop this weekend and not leaving until I figure it out or blow it up! LOL"

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2 Answers

2002 rodeo, starts and when put on gear stalls


Automatic transmission ??
Check engine lamp illuminated ??
Cold engine idle speed ??
Warm engine idle speed ??
IAC (Idle air control) system operation ??

May 28, 2015 | 2002 Isuzu Rodeo

1 Answer

My car is a 2000 impala 3.4l sedan front wheel drive but its from the last post i put up on here


that noise, my wild guess is MISfire. and the engine RPM is way too low at idle (how low?) below 800 rpm?
that is misfire, and will stall.
this is all normal for gross misfire. on any car,
the shop (real) would plug in the scan tool and look at the live data
from the PCM. and see if there are pending codes. P030x codes
and look at all live parameters.
they'd see, ah idle controls failed, and is misfiring.
loss of idle controls is cause by 2 things, (in proper order)
1: engine misfires, or runs real bad.
2: ISC idle controls dead. (can be caused by above, most times)

misfire has 50 causes, and about 1 to 10 tests to find them.
you can gue$$ or test.
which one floats your boat?

Jul 10, 2014 | Cars & Trucks

1 Answer

No codes random misfire idle down and stalls out and restarts on my 98 pontiac bonneville


sounds liek your crankshaft postion sensor but to be sure i would replace spark plugs and wires and change the oil if you havent recenly and check your air filter if its to dirty the car will stall

Jan 14, 2013 | 1998 Pontiac Bonneville

1 Answer

I have a 95 camaro with a 3.8l. It had a #1 cylinder missfire code, I found out it had a bad fuel injuector so i replaced it. Now, it's showing a random misfire code. What could cause this change


An intake vacuum leak can cause this as well as other issues, read about it below.
Check Engine Light On, P0300 Random Misfire Code A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn't getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. On most vehicles a normal reading is 17 to 21 inches Hg. If the needle is lower, is jumping up and down or steadily dropping, you have a vacuum problem. Look for possible vacuum leaks by checking vacuum hose connections, the throttle body and manifold, and PVC valve and plumbing. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire. The next thing you should check is the fuel pressure with a gauge. If it is not within specifications (refer to a service manual for specifics because fuel pressure is critical for proper engine performance), the problem may be a weak fuel pump, low voltage to the pump (check the relay and wiring), or obstructions in the fuel line (like a plugged filter). A bad fuel pressure relay can also leak pressure and prevent an otherwise good fuel pump from delivering full pressure to the injectors. Dirty injectors can also restrict fuel delivery and cause a lean fuel condition. Many regular grades of gasoline do not contain adequate levels of detergent to keep the injectors clean. Frequent short trip driving accelerates the buildup of injector deposits. Cleaning the injectors with a good quality fuel tank additive (or having them professionally cleaned) can solve this problem. Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your AutoTap Express DIY. If the numbers are high, it tells you the engine is running lean

Jul 27, 2017 | 1995 Chevrolet Camaro

1 Answer

My 2000 maxima idles rough and stalls makes a rattle sound got a code that said lean in bank one random misfire


the misfire would cause the lean code to come pop up. change your spark plugs and or coil connectors(the rubber boots on the coils)

Sep 13, 2011 | 2000 Nissan Maxima

2 Answers

1994 Toyota pickup 22re 4cyl has intermitent low, rough idle. Sometimes idles normally. I have also noticed that when AC is on and compressor is engaged the engine idle is normal but when the compressor...


You might have a bad coil. Under a load the coil might preform well, but under no load, its weak causing a misfire...thus giving you a rough idle. I have had this problem on a few vehicle. Check plugs, wires, and distributor. Mike.

Sep 18, 2009 | 1994 Toyota Pickup

1 Answer

Unstable RPM - is this also a safety issue??


yes here is the common problem

Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 15, 2009 | 2000 Isuzu Trooper

1 Answer

My bmw 328i misfire?


If u don't have a check engine light try this procedure to fix it.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 11, 2009 | 2003 BMW 325

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