Engine idle speed runaway after start
05-01-2014, 09:55 AM
#1
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
Engine idle speed runaway after start
1987 4.0 Renix: About 20% of the time after starting, engine idle speed goes to about 2500 RPM. Tapping the accelerator pedal has no effect. If you put in in gear, Jeep will go about 35 MPH by itself, like the cruise control is on. It eventually settles down on its own.
It does it even if cruise is turned off at the switch. It does it hot or cold. Throttle return spring under hood snaps back firmly with no binding. Cruise control cables are not tight or binding the throttle. I do not hear any vacuum leaks.
Ideas?
It does it even if cruise is turned off at the switch. It does it hot or cold. Throttle return spring under hood snaps back firmly with no binding. Cruise control cables are not tight or binding the throttle. I do not hear any vacuum leaks.
Ideas?
05-01-2014, 10:06 AM
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Year: 1991
Model: Cherokee
Engine: 4.0l
1987 4.0 Renix: About 20% of the time after starting, engine idle speed goes to about 2500 RPM. Tapping the accelerator pedal has no effect. If you put in in gear, Jeep will go about 35 MPH by itself, like the cruise control is on. It eventually settles down on its own.
It does it even if cruise is turned off at the switch. It does it hot or cold. Throttle return spring under hood snaps back firmly with no binding. Cruise control cables are not tight or binding the throttle. I do not hear any vacuum leaks.
Ideas?
It does it even if cruise is turned off at the switch. It does it hot or cold. Throttle return spring under hood snaps back firmly with no binding. Cruise control cables are not tight or binding the throttle. I do not hear any vacuum leaks.
Ideas?
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