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Old 02-26-2008, 12:37 PM   #1
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Default Cylender 4 misfire

so car was running fine, the SES light came on and still drove fine. I went to the gas station and filled up and it went out. Yesterday my wife was driving and when she started the car it started to shake and jerk around.

1, can we continue to drive like this? only car for my wife and its snowing like heck here
2. will changing plugs and wires fix the issue.

car has new UIM and lim as of 13k ago. NO loss of coolant and oil is clean.

how much of a pain is the rear 3 plugs? any special tools needed.
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Old 02-26-2008, 01:04 PM   #2
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If it is running that poorly, I wouldn't recommend driving it very much. It'* possible that new plugs and wires could solve the problem, and would be a good start if they haven't been done. As a quick starting point, pull the plug wire end off from the coil pack, and see if possibly one of the terminals has become corroded. If it has, cleaning that up may be able to get you by until the weather improves.

The back plugs can be a PITA, mostly in getting the boots off. Twist and pull, and push the metal covers down as far as you can to give you extra gripping space.
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Old 02-28-2008, 05:25 PM   #3
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the SES light keep going off when ever I want to get it scanned again at a real repair shop. It drove like crap threw light, next day no shakes and drove fine and light went away. So why does it keep coming and going?
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Old 02-28-2008, 05:28 PM   #4
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Pausable repeated misfire, have you changed the plugs and or wires yet?
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Old 03-21-2008, 10:37 PM   #5
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changed plugs and wires from napa ngk plugs and napa wires, car ran fine for 2 weeks ,yesterday it started again and car shut off on my wife on the highway. it shakes like crazy

what should i try now? coil packs? fuel filter? same misfire code as before
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Old 03-21-2008, 10:41 PM   #6
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Were you able to get the code scanned? If so, what is it?
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Old 03-21-2008, 11:19 PM   #7
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Is the wire touching the O2 sensor?
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Old 03-27-2008, 11:14 AM   #8
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well last night I swapped out the 1-4 coil pack and it still bucks, jerks and SES light is flashing. Disconnected battery and cleaned all the terminals etc.. WTF do I do now? replace the other 2 coil packs?

can it be a crank position sensor?

still throwing #4 cylinder misfire code, random mulitple misfire according to the autozone guy.

so far I have replaced

plugs with NGK
Napa wires
1 coil pack

after the new plugs and wires car ran good for about a week and problem came back. all the gaskets are dry and no coolant leaks at all. any ideas?
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Old 03-27-2008, 11:46 AM   #9
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I had a similar problem with my son'* '99 Grand Prix, with the misfire. His problem was a bad ignition control module. The only real test for it is to swap it with a known good one. Do you know of someone with whom you may be able to swap modules temporarily, as a test?
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Old 03-27-2008, 01:11 PM   #10
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I will try that, is it a hard to install? any idea where it'* located? is it where the coils sit on top of?
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