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2000 Jeep Laredo 4.7Liter V8 RPMs surge

Tiny
RD4813
  • MEMBER
  • 2000 JEEP GRAND CHEROKEE LAREDO
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
RPMs tend to surge to over 1,000 when stopped at traffic light/stop sign. Does not happen all the time.
Thursday, January 31st, 2008 AT 7:23 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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!
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Tuesday, February 5th, 2008 AT 9:54 AM
Tiny
RD4813
  • MEMBER
  • 5 POSTS
Check engine light is not on. Checked for vac leak as suggested, none found. Other suggestions?
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Friday, February 8th, 2008 AT 8:44 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
When was the last full tune up? Fuel and air filters? Clean throttle body? Plugs.
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Saturday, February 9th, 2008 AT 9:56 AM

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