Hi everyone. I started my 2001 TJ tonight and it revs all the way to the limiter instantly. I have the 4.0 I6 engine with the 5-speed manual transmission. I typically start the jeep with my foot off the accelerator pedal. I checked that the throttle cable is free and when I operate the throttle linkage everything seems to work without binding or resistance. I can't find any unplugged vac lines. The jeep was running normally up until now. I haven't done any recent engine work. I'm completely stumped on this. It revs so violently that I'm afraid to try to start it again. Anyone have any experience with this problem? I don't have clue. Any input on this would sure be appreciated. Thanks everyone.
Hitting rev-limiter on start-up
- Thread starter Vulture
- Start date
That is a typical response to a massive vacuum leak. Check the intake manifold for broken bolts. Check the brake booster vacuum line and barring any of those, make sure the IAC is functional and there is no issue with the TPS or harness.
Although not common, I have seen this happen on a different vehicle.
Make sure the butterfly isn't broken too!
Thanks guys! I spent about an hour this morning before I had to get to work looking at everything I could find on the vacuum system. So far I haven't found a thing. I'm gonna move on to the intake manifold and the IAC, the TPS, next. Thanks for the help!