Having problems with your 1990 Oldsmobile Eighty Eight ?

I have a 1990 Olds 88 Royale with 3.8 L engine. Engine idle too high. When I'm driving along, car is going at least 30-35 mph even with my foot completely off the gas pedal. In driving in urban areas, I have to constantly apply the brakes. Result? (1) high fuel consumption -- only 15 mpg. and (2) Have to replace front-wheel brake pads every two months. And (3) Dangerous. How do I solve this problem quickly and inexpensively. Car runs well otherwise, now has 170,000 miles. Thanks for any h

Posted / edited by AnonymousUser on : 12-11-2018

Answers :

Check for vacuum leaks ie. rubber hoses and such. Clean throttle plate and bore with an aresol throttle body cleaner, use a toothbrush and remove all the black soot frome corners. this will keep the plate from closing all the way and cause high idle. If this does not resolve the problem also check to make sure the throttle cable is not stuck or in a bind and keeping the plate from closing. Theese are the cheap ideas, next will be having codes pulled and having someone look at data stream. i would suspect a bad idle speed control motor or trash on its plunger.
Bring it to a reputable shop and have them look at your throttle positioning switch and throttle cable. Both are suspect by your description.
Repair Help & Product Troubleshooting for 1990 Oldsmobile Eighty Eight

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