2000 Jeep Laredo 4.7Liter V8 RPMs surge

2000 JEEP GRAND CHEROKEE LAREDO
130,000 MILES • V8 • 2WD • AUTOMATIC
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RD4813
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  • 5 POSTS
RPMs tend to surge to over 1,000 when stopped at traffic light/stop sign. Does not happen all the time.
Jan 31, 2008 at 7:23 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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MERLIN2021
  • CAR REPAIR CONTRIBUTOR
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If the check engine light comes on get the code read...post it here, if no light You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
Feb 5, 2008 at 9:54 AM
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RD4813
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  • 5 POSTS
Check engine light is not on. Checked for vac leak as suggested, none found. Other suggestions?
Feb 8, 2008 at 8:44 PM
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MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
When was the last full tune up? Fuel and air filters? Clean throttle body? Plugs...
Feb 9, 2008 at 9:56 AM