my 89 revs to 3k during start up and stays there

[netrachamp1853]

Once in a blue moon my 89 XJ with rev and just sit at 3k on start up..If i shut it off it will do it 2 or 3 more times before going back to normal....Anyone have this problem?

[chucks_net]

check the choke. Its not EFI right?

It should idle higher when cold but not 3K. Should be under 2K. Then you should be able to knock down the RPMs after a bit with a slight rev.

When was the last tune up?

[Bigbike]

Check yo TPS.

[JoeNitro]

just unload a can of carb cleaner into the throtel body. id also check the vacume lines around the throtel body just makesure they all good....

[crosbike]

just unload a can of carb cleaner into the throtel body. id also check the vacume lines around the throtel body just makesure they all good....

are u fucking retarded?

[CSaddict]

IAC or vac leak.

[CumminsJeep]

just unload a can of carb cleaner into the throtel body. id also check the vacume lines around the throtel body just makesure they all good....

[chucks_net]

Carb cleaner won't hurt injectors or throttle bodies -but you may need some new eyebrows when you are done

+1 for vacuum leak

[netrachamp1853]

Checked all vacuum lines and cleaned out the throttle body..Also took off the idle speed control motor and cleaned that out really good..So far so good..gotta keep driving it to see if it does it again.

[wannabejeep]

mine used to rev really high on start up. It wouldn't stay there though, it'd come right back down in 5 seconds or less. But I pulled my IAC and it was pretty nasty. Cleaned it up nicey nice and it was fine after that .

[WAD357]

If you havent already take a good look at all the vacumme lines before one does go bad.. alot of them get brittle especially being an 89.. I know both my 89s had bad vacumme lines for the map sensor and when replaced they ran 100k better