Having problems with your 1991 Mercury Grand Marquis ?

Engine idling fast - 1991 Mercury Grand Marquis

Posted / edited by AnonymousUser on : 18-03-2019

Answers :

The most common reasons for a high idle speed is a sticking throttle, vac leak, or a faulty idle air bypass valve. The computer uses the valve to control idle speed.
Repair Help & Product Troubleshooting for 1991 Mercury Grand Marquis

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