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1989 Oldsmobile cultlass ciera..Why does the tachometer read high when driving on HIGHWAY. will run 30 mile a hour without putting foot on gas pedal?
Wiki User
∙ 13y ago
Try checking the TPS (throttle position sensor) usually they raise the Rpm on Idle like that or on Drive .That be the first thing I do . Then check your Tachometer it may have a short bad connection etc. Also clean or replace the IAC (Idle air control Valve) as needed . Hope this gives you an Idea on where to start.
Wiki User
∙ 13y ago
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