2004 Jeep Grand Cherokee high rpms

2004 JEEP GRAND CHEROKEE
150,000 MILES • 4.0L • 6 CYL • 2WD • AUTOMATIC
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MICHAELODELL
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  • 2 POSTS
WE JUST DID A VALVE JOB AND REASSEMBLED.WHEN STARTING,THE ENGINE RUNS AWAY.EVEN WITH A RAG BLOCKING THE CARB.IT IDLED FINE BEFORE TEAR DOWN WHATALL SHOULD WE TRY?
ALL VACUM LINES SEEM TO BE INTACT.I'M NOT THERE,BUT MY BUDDY SHUTS THE ENGINE DOWN IMMEDIATELY.HE'S WORRIED IT WILL BLOW UP OR CAUSE DAMAGE.
THANKS
Dec 5, 2013 at 12:47 PM
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SATURNTECH9
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 30,869 POSTS
Sounds like a vacuum leak especially if its still doing it with the throttle body blocked off.get some canned smoke spray it into vacuum hose for the brake booster and see where the smoke is escaping.Should be easy to find.
Dec 5, 2013 at 12:56 PM
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MICHAELODELL
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WHERE CAN YOU BUY CANNED SMOKE.OR WILL ANYTHING ELSE WORK.ALSO CAN THIS BE DONE WITH THE ENGINE OFF?
Dec 5, 2013 at 1:07 PM
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SATURNTECH9
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 30,869 POSTS
I have seen canned smoke they use test smoke detectors you can use it with the engine off and must use it with the engine off.you could also use a cigar dont usually smoke them but worked in a pinched.you have to use a plastic bag to block off the throttle body before using smoke.i know they sell canned smoke on the internet not sure what stores in your area that might carry it.
Dec 5, 2013 at 1:16 PM