Question about 1997 Pontiac Sunfire

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

I noticed a lot of oil around the plugs indicating a possible seal bad but what could cause the misfire and what should I do to fix it without throwing parts at it?

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  • krystal odell
    krystal odell Apr 01, 2014

    the car cranks and runs but it seems to be having more trouble getting the power.

  • John Tunney
    John Tunney Apr 01, 2014

    It is most likely a bad head gasket. it is misfiring because the oil and antifreeze is leaking into the cylinders. you should notice blue or white smoke coming from the exaust

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  • Pontiac Master
  • 1,140 Answers

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

Posted on Jun 17, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: 2003 pontiac sunfire GT

When they say "bank," they're referring to cylinder banks 1 or 2. Bank 1 is the passenger's side and has cylinders 1-4 on it. Bank 2 is the driver's side and has cylinders 5-8 on it.

P0171/0174 indicates that the long term fuel trims have reached a maximum (should be somewhere around 30-35%). Fuel trims are how much fuel the PCM adds or subtracts. 0171/0174 indicates that the engine is running lean, meaning that outside air is getting past the mass air sensor. The O2 sensors see this excess air and the PCM responds by cranking up fuel trims to add more fuel for that more air.

Possible solutions include:

  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Posted on Jun 09, 2008

SOURCE: 1998 Sunfire rough running (missfire) common causes?

check the coils my 98 had a crack coil that drove me nuts. If thats the problem make sure you replace both ignition coils

Posted on Jun 18, 2008

  • 2039 Answers

SOURCE: 1997 pontiac sunfire gt

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

  • 1 Answer

SOURCE: How to change spark plugs in a 1998 Pontiac Sunfire GT

gt will have a 2.4L DOHC their beneath the cam cover right ontop

Posted on Mar 07, 2009

dsacco86
  • 1077 Answers

SOURCE: Missing, stalling Pontiac Sunfire

The OBD II code for P0400 is Exhaust Gas Recirculation Flow Malfunction.
I'm sure the only thing you have left is you may have to replace the EGR valve or check for any leak from the vaccum lines going to to EGR valve.

Posted on Jun 01, 2009

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2003 pontiac sunfire has clanking sound on passenger side of engine, has power but going uphill rpms are good but speed is bad.


Could be a dozen things. Sounds like you are not getting enough pressure. I'd have to hear it. Could have been ran too low on oil, n need new rings or seals, etc. Check ur fluids or it could be a dead cylinder... Standard or automatic

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How to change spark plugs in a 1998 Pontiac Sunfire GT


Dear Angel Divine, First determine whether you have a 4cyl. or V6 engine, then look at the engine bank/banks for the exhaust manifold and then the intake manifold, The plugs will be either be between the 2 manifolds(center of cylinder head) or between the exhaust manifold tubes. Call me back if you still have trouble. quicbric(volvo man)

Oct 02, 2008 | 1998 Pontiac Sunfire

1 Answer

1997 pontiac sunfire gt


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

Jul 04, 2008 | 2005 Pontiac Sunfire

1 Answer

2003 pontiac sunfire GT


When they say "bank," they're referring to cylinder banks 1 or 2. Bank 1 is the passenger's side and has cylinders 1-4 on it. Bank 2 is the driver's side and has cylinders 5-8 on it.

P0171/0174 indicates that the long term fuel trims have reached a maximum (should be somewhere around 30-35%). Fuel trims are how much fuel the PCM adds or subtracts. 0171/0174 indicates that the engine is running lean, meaning that outside air is getting past the mass air sensor. The O2 sensors see this excess air and the PCM responds by cranking up fuel trims to add more fuel for that more air.

Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Jun 09, 2008 | 2003 Pontiac Sunfire

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