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

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Failed tcm

There is no TCM in sunfire only truck have a TCM
you might want to say
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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

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