1989 Buick Century Repair Question
Topics covered: Engine, Gas, Intake manifold.
Mileage: 129,000 miles.
Mileage: 129,000 miles.
Asked on October 22, 2012
Buick Century Engine Problem
Start engine and it idles real fast I have changed the IAC valve
Asked by (pending member)Answer
Replied on October 22, 2012
Check for a vacuum leak in the hoses and intake manifold gaskets. When the engine is still cold, spray water on those parts while the engine is running. If you see the water get sucked in and the speed slows down for a few seconds, you found the leak.