1989 Buick Park Avenue Missfires while warming up

Tiny
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
Sunday, October 19th, 2008 AT 12:25 AM

3 Replies

Tiny
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
Tiny
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
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Sunday, October 19th, 2008 AT 4:11 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,603 POSTS
I am not sure if this helps but I started here more than a year ago with a Buick doing the same thing, I was looking for help and I found it to be a shorted fuel injector.
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Sunday, October 19th, 2008 AT 8:18 PM

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