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?
Possible valve guide seals are leaking motor oil. The motor oil on the spark plugs can cause a misfire and a loss of power.
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:
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
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
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
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.
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the car cranks and runs but it seems to be having more trouble getting the power.
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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