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1999 Jeep Wrangler Excesive Revving at start

Tiny
MHEDRICK_2000
  • MEMBER
  • 1999 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
After changing out the exhaust manifold and replacing the gasket, reconnecting all vac tubes and eletric connections, when I start the jeep it revs until I shut it down, before it redlines.
Saturday, July 19th, 2008 AT 1:31 PM

2 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi mhedrick,

An excessive amount of air flow into the intake manifold would cause the revving up.

Check if there is anything causing the throttle valve to be opened, eg, accelerator cable, foreign material lodged at throttle valve.

If any vacumn hoses or wire couplers are wrongly connected, it could also cause the problem.
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Sunday, July 20th, 2008 AT 12:23 AM
Tiny
MHEDRICK_2000
  • MEMBER
  • 2 POSTS
I went out and bought a quality gasket (vice the one in the kit) and applied Copper Spray. The manifold sealed and now it runs like a champ. NOT TO MENTION THE BETTER MPG!

Thanks again.
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Sunday, July 20th, 2008 AT 4:04 PM

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