Question about 1999 GMC Jimmy

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1984 Jimmy I have an '84 Jimmy and it idles at 1500 RPM. doeas anyone know what might cause this? also, i was driving for about 30 min, and when i got to where i needed to go it died on me. i had to leave it over night, came back the next day jump started it and voila. that would be a bad alternator right?

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High idle could be caused by a vacuum leak. If the car has cruse control, plus with it's age, it could very well be a vacuum leak. Check all your vacuum hoses going to and from the cruse control and the vacuum container. Also having a car die one night and needing to be jumped off the next day could be the alternator but it could also be a dead cell in the battery. Look at your battery. (if it has a cover on it, remove the battery cover) if the sides of the battery have a slight bulge in them, the battery could be going bad. Also if your "Maintenance free battery" is over 7 years old, your battery could very well be bad.

Hope that helps!

Posted on Nov 10, 2008

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