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GOLENJEEPTJ 10-14-2007 04:05 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!:confused:

jp'rs_peep'rs 10-14-2007 05:07 PM

RetraCE your steps....Is it operator head space? It happens to me a bit more then i'd like to admitt.


Triple88a 10-14-2007 05:20 PM

So butterfly on the throttle body is closed?

4.0l sahara 10-14-2007 07:05 PM

Did you do any thing with the iac?

Triple88a 10-14-2007 07:48 PM

it has to be something on the intake manifold side since you have to take it off when replacing the header...

mrbigjeep 10-14-2007 08:22 PM

vaccum leak...

distortedtj 10-14-2007 08:35 PM


Originally Posted by mrbigjeep (Post 149070)
vaccum leak...

yep vaccum leak ....check all vaccum lines.

GOLENJEEPTJ 10-15-2007 02:51 PM

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!!

1BLKJP 10-15-2007 04:10 PM

It's definitely the gasket on your header. Something isn't sealing right. Try getting a new gasket and doing it again.

Triple88a 10-15-2007 04:26 PM

2x. thats what i'm also thinking. Unless its a huge vacuum leak it should not be able to reach the redline.

Gary1129 10-15-2007 05:59 PM

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

4.0l sahara 10-15-2007 06:32 PM

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.:D

whitebuffalo 10-15-2007 08:03 PM

do u have an egr valve? otherwise, im going with vac line

4.0l sahara 10-15-2007 08:35 PM

I don't think a egr valve would cause that. And don't hink the 4.0 has egr. Does it?

whitebuffalo 10-15-2007 08:48 PM

dunno if it has one or not, i have a 2.5, but one stuck open will make it rev....

4.0l sahara 10-15-2007 09:06 PM

:DI know but not red line it.

whitebuffalo 10-15-2007 09:44 PM

whatever u say boss :D

GOLENJEEPTJ 10-16-2007 07:24 PM

re: throttle body
When I start the engine it just starts racing! I watch the butterfly and it stays closed!!??? :-(

4.0l sahara 10-16-2007 08:46 PM

Then you have a leak somewhere else you need to take a close look at all lines and gaskets etc.:D

E Curtis 04-15-2010 10:21 PM

E Curtis

Originally Posted by GOLENJEEPTJ (Post 149723)
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?

distortedtj 04-15-2010 10:25 PM


Originally Posted by E Curtis (Post 599729)
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?

Jerry Bransford 04-16-2010 12:56 AM

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. :)

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