Question about 2000 Pontiac Grand Am GT

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2001 Pontiac grand am misfiring. replaced plugs,

2001 Pontiac grand am misfiring. replaced plugs, coil packs to no avail. tested the ignition control module which tested fine. did the code test which only tells me that there is a misfiring problem. don't know what else to check

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  • mike loshbough
    mike loshbough May 11, 2010

    What is the code number?

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Mine just had that problem...its your M.A.P...I went to the shop to get my check engine light to go off and it said my MAP was bad so i had it fixed and I dont know what they did but after they put it on my car started misfiring...I just left mine unplugged and it runs like new...but if i plug it up my car misfires again...

Posted on Mar 07, 2010

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Did you replace plug wires also if you did look for a bad injector

Posted on Jan 31, 2010

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2005 grand prix 3.8 misfire changed plugs wires coil pack checked ignition module lost on what to do next PLEASE HELP driving like crap shaken sputtering it still starts


misfires seldom can be contributed to what you have done
The injectors and fuel pressures play an important part in misfires that is overlooked
run the fault codes to determine where the fault is .

Oct 05, 2013 | 2001 Pontiac Grand Am SE

1 Answer

No spark to the spark plugs


When a problem like this occurs the very first thing that must be done is to have the module that controls the engine tested for fault codes, this is called an OBD2 fault code test. Once you have the fault code a trained technician must do the diagnostics outlined for the code in the factory repair manual and replace the appropriate parts.

Jun 07, 2012 | 1999 Pontiac Grand Prix

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Where is the ignition module. Can I get to it from under the hood? Should I replace the Crank module when I replace the ignition module?


Hi.

The ICM is located under the hood, next to the coil pack and spark plug wires. Here the part: Pontiac Grand Am Ignition Control Module (ICM).

If you ar having distribution problem and misfire check also the crankshaft position sensor. It signal is used to control coils and sparks.

Aug 29, 2011 | 1989 Pontiac Grand Am

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I have a 2000 grand prix gtp and I've replaced heads wires plugs ignition coils fuel injector fuel pump and I stool get a misfire in cylinder 5 code any ideas


If your getting your info from code in ecm on the misfire, you may need to reset your ecm , If you can feel your misfire you might check Distrubtor cap. good luck to you.

Mar 28, 2011 | 2000 Pontiac Grand Prix

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I have a 99 grand am SE 2.4 4 cylinder and my problem #2 misfire, repalced spark plugs with AC delco rapid fires, replaced coil packs, replaced coil pack housing, changed spark plug boots, had ignition...


A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Feb 25, 2010 | 1999 Pontiac Grand Am GT

1 Answer

Scanner shows po300 random missfire code,replaced plugs, wires, ignition module,gas filter,checked ohms on coil packs, all 3 test close to identical.Every once in a while, all the guages drop to zero for a...


I have a 1998 Sunfire/ son warp the Head by not finding a leak that was the water pump. had head grounded down and reconnected. now i get a PO300 and it a misfire random. took the Ignition coil/ignition control madule to a shop and was test 3 times, first time it showed it failed , they did two more test on it and it passed. At night i turn off all the lights in Garage and sprayed a fine mist of water over the spark plugs and saw some flashing , not much very light on a couple of plug wires. Any one have an idea of what it may be . thanks for reading and i hope someone can give me a good idea thanks again

Jan 12, 2010 | 2004 Pontiac Grand Prix

1 Answer

88 grand am


If you have a volt/ohm meter, you may want to first ohm check the resistance between the two spark plug towers on each ignition coil pack. Simply remove the spark plug wires from each coil pack and test. Both (if good) should test about the same resistance, (about 5-7 kOhms, but I don't have the exact specs handy on this particular vehicle. The reading may be higher, maybe around 7-12kOhms) but nonetheless, the reading of the 1-4 coil pack should closely match the 2-3 coil pack. If not, the new coil pack may be faulty and should be returned for a replacement.

Also, when you remove the 1-4 coil pack, take a look at the primary spade connectors (2 lugs) coming out of the ignition module. Make certain these are clean and free of rust or corrosion. If so, simply (and gently) use a finger nail file or 400 (or equivilent) sandpaper to file the corrosion off and re-attach the coil pack.

If one or both of these don't fix the problem, you may have to look at replacing the ignition module. But only do that after exhausting the other simpler and less expensive tests! :)

I hope these tips help you out or at least point you in the right direction! :)

Aug 19, 2009 | 2003 Pontiac Sunfire

2 Answers

03m grand am p0300 multiple misfires, cats seem fine, changed fuel filter, dont know what to do next


this could be caused by a couple of things. Defective plug wires, coil packs cause this as does the Ignition control module. Also being overful on oil will also cause a multiple misfire on your particular vehicle and others. Hope I narrowed it down some for you.

Jun 28, 2009 | 2003 Pontiac Grand Am

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