Question about 2005 Pontiac Sunfire

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1997 pontiac sunfire gt

The engine is misfiring. the scan reads p0300

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  • 6598 Jul 05, 2008

    replaced spark plugs,coil to plug connectors,checked both coils- they were ok. I'm wondering if it is a burned valve.

  • 6598 Jul 08, 2008

    replaced coil pack housing. that corrected the problem.

    thanks pierre235.

    thanks everyone for your help.

  • jvicindy29 Aug 03, 2008

    I just wanted to know what could case a miis fire on cylinder 1

  • Anonymous Sep 24, 2008

    i have a sunfire 2.4 with 0300 code.Changed just about every ignition part except coil pack housing.Even changed fuel injectors and regulator and fuel pump.its a 1997

  • Anonymous Mar 14, 2014

    Put in a used 3.4 2001 engine..engine code reads multiple misfire plus pass key light is on and wont go off

  • Anonymous Mar 15, 2014

    mile odometer reads error


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300 is cylinder missfire check the ignition coil but the basic is high tension wire and spark plug hope it FIXYA our problem thanks pierre

Posted on Jul 04, 2008

  • pierre laplante Jul 06, 2008

    burn valve you would have 301 .302,303,304, 300 miscellanios not the same cylinder so im sure our valve are ok im sorry you have a gt that mean you got a quad 4 engine so no wire the coil are under a housing if our coil are good you have a crack housing it like a bad distributor cap the spark goes in the crank insted of going to the plug hope it FIXYA our post thanks pierre


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97 pontiac sunfire gt 2.4 cylinder 1 missfire. just changed the plugs and the cat

Possible valve guide seals are leaking motor oil. The motor oil on the spark plugs can cause a misfire and a loss of power.

Apr 01, 2014 | 1997 Pontiac Sunfire

1 Answer

Failed tcm

There is no TCM in sunfire only truck have a TCM
you might want to say
PCM and engine soon light flashing cause of misfire engine ....retrieve code and you see P0300 or P0301 or P0302 or P0303 or P0304 .the last number is for the cylinder number misfire and the P0300 for multiple misfire
hope it help

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Machine is on my sunfire pontiac 1998 and gives me the code 300. what would that be??

P0300: random multiple cylinder misfire

How long has it been since this car has had a tune up? Any other driving symptoms? This usually indicates one of a few things, worn spark plugs, clogged fuel/air filter, or vacuum leak.

Jun 30, 2011 | 1998 Pontiac Sunfire

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Jun 28, 2011 | 1997 Pontiac Sunfire

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I have a 96 Pontiac sunfire GT with the 2.4 engine it has a super bad misfire I have replaced the map sensor, plugs, coil pack, fuel rails. what elsa could be causeing this promblem

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May 22, 2011 | 1997 Pontiac Sunfire

1 Answer

Trac off light came on and off then stayed on while driving, p0203p0204 p0300 codes when scanned with little machine better read open circuts in both injectors loss of power

P0203 - Injector Circuit Malfunction Cylinder 3

Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.

- Open or shorted wiring harness to the injector #3
- Bad injector #3

- If damage, repair injector wire harness or connector
- Replace injector
- Replace PCM or ECM

P0204 - Injector Circuit Malfunction Cylinder 4

Same info as the P0203 DTC

P0300 - 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.

- 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

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

Feb 03, 2011 | 2001 Pontiac Sunfire

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