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1991 Buick Riviera jerks

Tiny
JAMINRC
  • MEMBER
  • 1991 BUICK RIVIERA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
My car will jerk or miss occasionally. Usually at highway speed. Some days it won't do it and sometimes it does it several times in 10 miles.
Thursday, July 23rd, 2009 AT 8:25 AM

4 Replies

Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
We need a little bit more info from you.
You need to be my eyes, ears, and body.

I'm fishing for details, like it will improve if you step on the gas peddle harder or less,

it does it only when it's hot

it only does it on days that end with "Y"

stuff like that.
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Thursday, July 23rd, 2009 AT 7:34 PM
Tiny
JAMINRC
  • MEMBER
  • 4 POSTS
It does it when it's hot, under load, like going up a slight incline. It does not do it under heavy acceleration. I have changed the plugs and I'm going to change the fuel filter.
Steve
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Friday, July 24th, 2009 AT 7:40 AM
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
Simulating a load in the garage is going to be hard to accomplish.

The first thing I would check is the fuel pressure.
And a compression test, just to rule them out.

After that we get to guess if it's an injector or ignition problem.
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Friday, July 24th, 2009 AT 9:39 AM
Tiny
JAMINRC
  • MEMBER
  • 4 POSTS
I will check pressure and compression, it may be a week or so before I get back to you.
Thanks, Steve
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Friday, July 24th, 2009 AT 1:25 PM

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