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Topic Review (Newest First)
04-16-2010 01:56 AM
Jerry Bransford You have a vacuum leak. Generally speaking nothing else, usually that is, causes that problem. This happens all the time when people work on their intake/exhaust manifold. If you have had the intake manifold off or loosened it up for any reason, you simply did not get it seated back into place against the head properly. Move it into the correct position, making double-sure it is properly in position, then tighten it down using the correct tightening sequence and ft-lbs. tightness.
04-15-2010 11:25 PM
Originally Posted by E Curtis View Post
Im having the same problem right now. Have you figured it out yet?
What have you done to the motor? IE.. gasket swap...anything or did it just start?
04-15-2010 11:21 PM
E Curtis
E Curtis

Originally Posted by GOLENJEEPTJ View Post
When I start the engine it just starts racing! I watch the butterfly and it stays closed!!??? :-(
Im having the same problem right now. Have you figured it out yet?
10-16-2007 09:46 PM
4.0l sahara Then you have a leak somewhere else you need to take a close look at all lines and gaskets etc.
10-16-2007 08:24 PM
re: throttle body

When I start the engine it just starts racing! I watch the butterfly and it stays closed!!??? :-(
10-15-2007 10:44 PM
whitebuffalo whatever u say boss
10-15-2007 10:06 PM
4.0l sahara I know but not red line it.
10-15-2007 09:48 PM
whitebuffalo dunno if it has one or not, i have a 2.5, but one stuck open will make it rev....
10-15-2007 09:35 PM
4.0l sahara I don't think a egr valve would cause that. And don't hink the 4.0 has egr. Does it?
10-15-2007 09:03 PM
whitebuffalo do u have an egr valve? otherwise, im going with vac line
10-15-2007 07:32 PM
4.0l sahara Did you clean the mating surface well?
Check all the lines.
Did you check for leaks around the base of the tb?
Did you check the surface of the intake with a straight egde always the chanch it's warped.

If you have a vac gauge check it out. A vac gauge can tell you alot about a engien.
10-15-2007 06:59 PM
Gary1129 Unmetered air is getting in the induction side.......check all your hoses rubber hoses are notoriously crappy.......ya may have bumped one or split the end when ya took it off and not even noticed it.....g
10-15-2007 05:26 PM
Triple88a 2x. thats what i'm also thinking. Unless its a huge vacuum leak it should not be able to reach the redline.
10-15-2007 05:10 PM
1BLKJP It's definitely the gasket on your header. Something isn't sealing right. Try getting a new gasket and doing it again.
10-15-2007 03:51 PM
GOLENJEEPTJ Redid the whole header and intake manifold reseal this morning and it does the same thing? It will go too 6 grand rpm if I don't kill the engine! Gasket lined up great with Banks header. Everything went fine untill I started it again! Same thing. Yes my butterfly is closed on 62 throttle body. I even dissconected the throttle cable. Same thing!!
10-14-2007 09:35 PM
Originally Posted by mrbigjeep View Post
vaccum leak...
yep vaccum leak ....check all vaccum lines.
10-14-2007 09:22 PM
mrbigjeep vaccum leak...
10-14-2007 08:48 PM
Triple88a it has to be something on the intake manifold side since you have to take it off when replacing the header...
10-14-2007 08:05 PM
4.0l sahara Did you do any thing with the iac?
10-14-2007 06:20 PM
Triple88a So butterfly on the throttle body is closed?
10-14-2007 06:07 PM
jp'rs_peep'rs RetraCE your steps....Is it operator head space? It happens to me a bit more then i'd like to admitt.

10-14-2007 05:05 PM
re: CHANGED HEADER GASKET now full throttle

I just changed the header and gasket on my 02 TJ. Now when I start the ride it goes to full on throttle. Thought it was my throttle cable binding,nope! Checked my dtcs, nothing! Anybody out there have an idea on this one? I have done this before and it has never reacted like this! Please help!!! Thanks guys!

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