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Gary, Buick Technician
Category: Buick
Satisfied Customers: 16751
Experience:  15 years master GM tech and mater ASE tech
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GM Buick LeSabre: 2003 Buick Lesabre with occasional rough

Customer Question

2003 Buick Lesabre with occasional rough idle. Seems to happen after car is warmed up then allowed to sit for half hour. Then the rough idle at start-up.
After I hold the gas down a bit to run the engine for a few minutes, the problem seems to go away.
Submitted: 2 years ago.
Category: Buick
Expert:  Gary replied 2 years ago.
Welcome! My name is ***** ***** I will do my best to assist you with this problem.
I am sorry for the long wait
after the code was cleared will it re set any codes ?
if you run the engine for a while until its hot then shut off the engine and pull off the small vacuum line off the fuel pressure regulator will there be any fuel leaking out of the port on the regulator the vacuum line connected too ?
Customer: replied 2 years ago.
I have no new fault codes. I will try the test with the fuel pressure regulator. I will not be able to test it until 6PM.
Where is that located?
Expert:  Gary replied 2 years ago.
on the fuel rail!1045&authkey=!AE-vZdnBfT5NZ74&v=3&ithint=photo%2cgif
Customer: replied 2 years ago.
Ok... I'll check it out. What if that checks ok?
Expert:  Gary replied 2 years ago.
then we will go a different direction if the fuel pressure is good
we might have to possibly view live computer data when its acting up to nail this down