Question about 1999 Buick Park Avenue

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1999 buick park ave 3.8

Car stalls under load often at low rpm. New items are plenum, i a c, Test items are Fuel pressure(good) Map(good) TPS(good)

If left at idle with ac on it will idle at 835 - 859 = ok

But it sometime just die while in park if you let it idle long enogh.. no troubl starting hot or cold... but does tend to die at norm op temp.

?????????

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I am assuming this is a non supercharged car. I have had this problem before be sure to check every vacume line there is a plug at the left end the plentum its a plug for the boost valve (ie. supercharged motor) this has a rubber o ring its orange, you have to twist plug to get it out. Make sure its seated properly adding a small amount of oil to seal to help it seat also pull a vacume on it a see if it holds a vac these motors are twitchy when it comes to vac leaks hope this is of some help. If you had plentom gasket changed check to make sure every thing was tighted down properly take care to look at both ends of plentom one question was the intake gasket replaced also if so permatex is used on the ends so check there also this sounds like a vac leak very small one but one none the less

Posted on Jul 18, 2008

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