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Meangreen55

Meangr ... 5/23/2018

2003 Pontiac Grand Am GT 6 Cyl 3.40L

Engine

I have a misfire in cylinder 2 and cannot seem to find the answer.

I recently started to get a misfire in cylinder 2. I replaced the fuel injector have newer spark plugs, i checked the plug wires and coil pack. I even got a new evap sensor none of this has fixed my issue.

2 Answers


Jimm

Jimm 5/24/2018

For the misfires P0302: Cylinder #2 misfire

It may mean that one or more of the following has happened:

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

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ahanlov

ahanlov 12/3/2018

I know that I'm 6 months late to your question, but I'm throwing this out there in case it helps anyone else with a similar issue.

My 06 Pontiac Torrent was throwing a P302 Cylinder 2 Misfire code at one point. I did some internet investigating since I hadn't noticed any acceleration or driving problems (that would indicate spark plug/wire issue) and learned that it could possibly be a loose gas cap. I went to the auto parts store that day and bought a locking gas cap. After installing the new gas cap, I never saw the P302 code again.

This is a $20 fix that might just fix your problem. If it doesn't, at least you have a locking gas cap and won't ever have to worry about someone siphoning your gas (which happens, believe me).

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