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What causes the idle speed to run erratically between normal and 2500 RPM all the time?

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βˆ™ 2008-09-08 13:33:08

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Look for a vacuum leak. It may be on the throttle body or it may be associated with the EGR valve assembly. Sometimes you can spray a small amount of starting fluid at a suspected vacuum leak and if there is a leak at that point, the engine will suddenly start to sound different while it burns off the starting fluid. For a vehicle to have a pulsating idle from approx. 800 rpm to 3000 rpm approx. the issue is not with vacuum but with the TPS ( throttle positioning sensor).

2008-09-08 13:33:08
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Q: What causes the idle speed to run erratically between normal and 2500 RPM all the time?
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