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High Idle Speed

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Old 04-15-2012, 01:18 AM
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Default High Idle Speed
On my 99 cherokee I replaced the spark plugs, ignition wire, distributor cap, and rotor and now it has a high idle speed of 1700 rpm. I check and made sure there are no loose lines or fittings and it is the correct firing order. I also checked the throttle linkage and it seems to be okay.

Any Ideas of would cause this.
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Old 04-15-2012, 01:33 AM
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So, no high idle prior to the tune-up?
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Old 04-15-2012, 09:22 AM
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No prior to tune it was idling at 800 rpm
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Old 04-15-2012, 09:25 AM
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Originally Posted by daklaw
On my 99 cherokee I replaced the spark plugs, ignition wire, distributor cap, and rotor and now it has a high idle speed of 1700 rpm. I check and made sure there are no loose lines or fittings and it is the correct firing order. I also checked the throttle linkage and it seems to be okay.

Any Ideas of would cause this.
Throttle plate is closed @ idle?
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Old 04-15-2012, 01:25 PM
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You may have knocked a vacuum line off someplace. A high idle is a sign of a vacuum leak.
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Old 04-15-2012, 01:27 PM
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vacuum line around back off motor to vacuum ball
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Old 04-15-2012, 06:22 PM
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I agree that a vacuum leak is the primary suspect here. Now to find it. Good luck!
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