Engine idle

Asked by GuruLMXV9 Apr 29, 2019 at 05:52 PM about the 1998 Ford Explorer 4 Dr Eddie Bauer AWD SUV

Question type: Maintenance & Repair

What would cause the engine to
race when you start it ?.the rpms
goes up to 5. Then back down
then back up .

3 Answers

GuruLMXV9 answered 5 years ago

Ive had plugs and wires and shocks put on it. I did one thing I shouldnt-- I put the wrong gas in it. No octane kind for mowers. Thats when it started not idling right. Then I put the right gas in it. That made a world of difference. But the idling just races so loud. It sounds like a 747.lol.

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103,215

KenF answered 5 years ago

most common cause is a vacuum leak. Check for leaks around the PCV.

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26,835

taver91 answered 5 years ago

Don't know what you mean by "no octane kind for mowers" but your engine should be fine with 87 octane gas. The gas is not your problem. Have you had the car scanned for error codes? That may reveal a sensor or component failure and lead to a fix.

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