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Re: Pontiac Grand Am 97'
The check engine light should turn on during a misfire. If you don't have an OBD2 diagnostic tool, go to your local parts place and have it checked out. My local Autozone and Advance will do it for free and let you know what's wrong. Don't start changing parts until you know what's really wrong. That's a waste of money! I had a 1997 Grand Am 4 cylinder and the OBD2 code was a misfire on two cylinders. They shared a common coil and I changed it, then the misfire was gone.
I have a 97 grand am with a 6 cyl. that was also experiencing the same misfire problem. I thought it was water in the fuel. I put fuel fuel injector cleaner and heet in fuel tank, and it would do a little better for a while but the symptoms would return. I was about to remove the injectors to see if they were clogged but decided to check out the coil packs instead . Using a spark tester connected between the coil and plug wire I noticed that the coil for cyl # 5 and # 2 was not firing when accelerated. So I purchased a replacement for that coil and now it runs fine!
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No, a plugged converter would cause the engine not to breathe properly. Too much back pressure would stall the engine or make it run very poorly. It would not be local to any one cylinder-all of them would be affected.
To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.
Misfiring can be cause by ignition coil,spark plugs,wires,engine valve,cylinder compression,
if it's a quad four then crack around the ignition coil. there is 2 coils like 1-4 coil and 2-3 coil
first check spark plug color or foul of gaz
hope it help
I'd have fuel pressure checked, and at the very least, replace fuel filter. Not unusual to get multiple misfire codes due to low fuel pressure, thus starving cylinder(s), and causing the misfire code(s).
Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.