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1999 Buick Park Avenue 99 Buick intermittently runs rough

Tiny
FIREFLYNJ
  • MEMBER
  • 1999 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 206,000 MILES
Some times it runs great then there are bad days, weather has no effect. Tried, new wires and spark plugs, no help.

today it ran good at first, but after an 40 min drive it started missing right when it was going thru the state inspection center, and it passed!

ran bad the rest of way home, gets worse when trying to climb hill, I pressed the pedal down to push the car, ran real real rough, and service engine light came on.
codes I got were P0303, P0401, P0507 and P1404.

I took the EGR valve off and spayed it with carb cleaner. Didn't help car was still running rough after almost cooled off. Disconnected EGR 4pin connector, no change.

what else should I try?
there are times that the car has minor missing, which effects the trans not downshifting.

Thanks
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Thursday, April 1st, 2010 AT 7:41 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Are you sure the EGR is good? IF you disconnected it and there was no change, it may be the problem.
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Wednesday, April 7th, 2010 AT 7:59 AM
Tiny
FIREFLYNJ
  • MEMBER
  • 3 POSTS
Follow up.
I didn't want to be buying new parts for this old car unless I sure it was the problem.

I was able to swap parts with another car, the EGR valve was not the problem, it was the coil pack/ECM, I found corrosion on the connection tabs between the coil and ECM, tried cleaning it but didn't last, I finally picked up a coil/ECM for $46 used and now running pretty good.

Thanks
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Thursday, April 22nd, 2010 AT 10:20 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
I'm glad you got it fixed. Let us know if you have questions in the future.

Joe
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Friday, April 23rd, 2010 AT 6:30 AM

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