Engine goes to a fast idle repeatedly. Stopping the engine and restarting always resets to normal, but drive a short time and it will resume the fast idle. Vacuum system checked and OK, Throttle position sensor harness replaced, Idle control motor replaced, ECM replaced - all with no results. Ecm calls for high idle speed in spite of all inputs reading normal.
Clean the small breath hole in the intake at the bottom.
Where is this at? Having idle problems with a 94 Olds 88 Royale also.
on the intake (carb) there is some pipes in the middle coming off these are the breather lines, remove all of them and blow down them to check they are clear. the main one you need to clean it the on that come from the top of the engine to the middle of the (carb) there is a small hole inside there that can be block by burnt oil managing to get through the line and block off the air so the engine revs up to get more air.
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SOURCE: replaced the computer in a
YOU MAY HAVE TO GET THE COMPUTER REPROGRAMED! THEY CAN EASILY DO THIS AT GM DEALER!
SOURCE: 1990 Olds 88 Royale; engine stalls
1990 olds culass suprem, is there any transmission vacum lines. down shift hard,when it warms up it,s shift fine.
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