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High Idle Speed

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Old Apr 15, 2012 | 01:18 AM
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daklaw
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From: Salina, Kansas
Year: 1999
Model: Cherokee
Engine: 4.0 Liter
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 Apr 15, 2012 | 01:33 AM
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Roler
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From: Australia
Year: 1997 (RHD)
Model: Cherokee (XJ)
Engine: 4.0 ltr
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So, no high idle prior to the tune-up?
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Old Apr 15, 2012 | 09:22 AM
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daklaw
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Year: 1999
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No prior to tune it was idling at 800 rpm
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Old Apr 15, 2012 | 09:25 AM
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Turbo X_J
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From: ☼ Blackhole Sun
Year: My Jeep is a GMC
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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 Apr 15, 2012 | 01:25 PM
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From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
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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 Apr 15, 2012 | 01:27 PM
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Year: 1989 xj sport 2dr
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Engine: 12 hole bosch Injectors
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vacuum line around back off motor to vacuum ball
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Old Apr 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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