04 GC RPM Spikes and Engine Stutters
#1
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Model: Cherokee
04 GC RPM Spikes and Engine Stutters
2004 Grand Cherokee Limited
Start the vehicle and sometimes the RPM will spike instantly at about 2500 rpm. Goes down eventually or when I shift it into reverse/drive.
When I stop at lights or stop signs the engine will jerk sometimes.
RPM will spike sometimes on the highway - going 120km/hr RPM is normally about 2400 but sometimes will spike to 3500+ with no change in speed.
Help please!!
Start the vehicle and sometimes the RPM will spike instantly at about 2500 rpm. Goes down eventually or when I shift it into reverse/drive.
When I stop at lights or stop signs the engine will jerk sometimes.
RPM will spike sometimes on the highway - going 120km/hr RPM is normally about 2400 but sometimes will spike to 3500+ with no change in speed.
Help please!!
#2
Old fart with a wrench
IDK what's causing the high idle except possibly a large vacuum leak, but it's hammering your transmission! The sudden change in rpms at speed is probably it shifting out of O/D. This normally happens when engine torque drops below what the PCM thinks is sufficent to maintain speed. Dropping it into gear at 2500 is putting a lot of stress on the clutches.
Check your CCV for a cracked hose or elbow. Also your MAP sensor hose. It also could be the power brake booster, but you'd hear a whistle under the dash.
Check your CCV for a cracked hose or elbow. Also your MAP sensor hose. It also could be the power brake booster, but you'd hear a whistle under the dash.
Last edited by dave1123; 08-07-2013 at 02:59 PM.
#4
Old fart with a wrench
You can also check/clean your idle air control and your throttle position sensor.
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