1989 Buick Park Avenue Missfires while warming up

CASEY LAY

MEMBER
1989 BUICK PARK AVENUE
6 CYL
FWD
AUTOMATIC
304,500 MILES

While engine is cold it runs great. When warmed up all the way it runs great. After five to ten miles after starting in the morning it misfires. Coughs and kicks then its ok again until I shut it off and it cools down then problem starts again. Have installed new plugs, wires temp sensor. Even though this car has high mileage it is an awesome car that stutters. LOL

3 Replies

MMPRINCE4000

MECHANIC
8,548 POSTS

Check the coil and ignition module and connections to it.
I would also change fuel filter and measure fuel pressure with a mechanical gauge.

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Sunday, October 19th, 2008 AT 5:57 AM

CASEY LAY

MEMBER
2 POSTS

Ok, I have changed the fuel filter last week The problem was there b4 and after.I have just changed the coil pack and ignition module(which was expensive) Just test drove the buick and no change. I don't have a mechanical pressure tester but the fuel has good flow and squirted pretty good when the fuel filter was changed. Is there any kind of sending unit that might be bad? I heard that some additives can hurt some sensors but don't know which ones or where they are?

10/20/08
question: I have done what was told about my Buick which has not helped except eliminate the extra money in my wallet. If answer to my question is not correct is there another answer. Its said if I am unhappy I can have a refund? ? ?My car still coughs and stutters while warming up. While cold its great and when warmed up all the way its great. New plugs, new wires, new fuel filter, new coil pack, new ignition module