Question about 1997 Pontiac Bonneville

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Random cylinder misfires on cylinders 2,4,6 only. I already replaced plugs, plug wires, and ignition module.

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  • Pontiac Master
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U need to check the intake manifold for vacuum leaks as it is a common cause of this problem, also fouled dirty fuel injectors can cause this issue with a P0300 (ramdom miss), to check for intake vacuum leaks get a can of carburetor spray from any auto parts store, spray around the area of the intake near the cylinder connection, listen to the sound of the engine, if you hit a leak you will hear the idle change, if it is running rough the engine will smooth out for a few seconds, if this is negative have the fuel injectors pressure cleaned by a GM dealer, just dumping a can of cleaner into the gas tank will not do it, I have repaired many miss-fires like this with a high pressure injector clean at my dealership, it is worth the money.

Posted on Oct 02, 2009

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  • Master
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Check fuel injectors on that side. Other than that - I'm thinking a diagnostic check would be the answer.
Could also be ECU may need an update.

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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1 Answer

Hi, I have a 2001 Mazda 626 that idles rough when I first start it, not always but sometimes, what could this be? It is a 2.0 Lfour cylinder.


I have mostly found it is a wire plug. I usually fix them, but some times have to replace them. If you have a random misfire it could be the crank sensor or ignition module. If the misfire is on two cylinders, it could at the coil or ignition module. If the misfire is just one cylinder, look at the injector plug. Just a note. It could be any one of these parts. Have the codes read. This will point you to a certain part.

May 28, 2016 | Mazda Cars & Trucks

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Replaced coil pack on 3800 pontiac bonneville and its still missing what now?


First you need to determine what type of miss you have. Is it random on all cylinders, or is it restricted to one or two cylinders? Random misfire can be caused by crank or cam sensors that are starting to give out. Single cylinder misfires can be due to plugs, wires, coils (you already addressed those), as well as internal issues such as burnt or broken valves.

Oct 23, 2015 | 2000 Pontiac Bonneville

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Has p0300 code misfire cyl 2 and 3


If it was just cylinder 2 or 3, the code would be 0302 or 0303. Instead, you have random misfires (probably) such that you should be checking things that affect the whole engine. Vacuum leaks, bad plug wires, bad coil(s) or ignition module are most likely, but even clogged exhaust, O2 sensors and bad battery can cause these problems. Yes, a battery can be good enough to start your car but still be bad enough to affect performance. If I had to guess, I would start by testing the ignition module. Most parts stores can test this if you remove it and carry it to them.

May 04, 2015 | 1998 Chevrolet Blazer

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Why won't my car start?


P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Apr 25, 2015 | Cars & Trucks

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My 1996 Taurus when I press the gas pedal when cold it sputters and lacks power. When it warms up it runs great.


Possible causes - Faulty spark plug 5
- Clogged or faulty fuel injector 5
- Faulty ignition coil 5
- Fuel injector 5 harness is open or shorted
- Fuel injector 5 circuit poor electrical connection
- Ignition coil 5 harness is open or shorted
- Ignition coil 5 circuit poor electrical connection
- Insufficient cylinder 5 compression
- Incorrect fuel pressure
- Intake air leak

The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes



When is the code detected? Engine Cylinder 5 is Misfiring.


When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.



Oct 21, 2014 | 1996 Ford Taurus

1 Answer

P0300 and p0302


p0300 is for random misfiring. yes it does sound like the ignition module but just for kicks I would inspect all wiring to the module just to make sure you don't have any nicks or other damage. also you say you replaced plugs, how about plug wires? I have seen nicked or misrouted plug wires also cause this

Nov 21, 2011 | Cars & Trucks

1 Answer

I have a po 300 engine code random cylinder misfire i change cap rotor and wires problem still exists


PO300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

Jan 27, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Engine stalls randomly engine code for ignition module group b, and misfire in cylinder 2 (302). changed sparked plugs problem got worst


Misfire means...spark plug is not working or you have a loose compression on cylinder. 2. Have the cylinder 2 test for compression and advice.

Oct 07, 2010 | Cadillac Seville Cars & Trucks

1 Answer

1998 Cavalier No Spark in cylinders 1 & 4


ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Jan 13, 2009 | 1998 Chevrolet Cavalier

7 Answers

Random Cylinder Misfire


The problem is the ignition control module such is under the coil packs. It seems to be an internal problem in the design. I have seen it many times and if you don't belive as many will not. So disconnect the modules electrical connector and just let it sit for two to three days. After that clean ir replace your sparkplugs, they will be fails up dew to it running lean and rich. Plug it in. Plug it in and wala its fixed $ but only for a week or two then back to the same thing so in short change the ignition module and save time and money, and don't forget to thank your friendly neighbor hood mexican mechanic.

Jul 09, 2008 | 2000 Buick LeSabre

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