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Old 10-14-2007, 05:05 PM   #1
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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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Old 10-14-2007, 06:07 PM   #2
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RetraCE your steps....Is it operator head space? It happens to me a bit more then i'd like to admitt.

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Old 10-14-2007, 06:20 PM   #3
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So butterfly on the throttle body is closed?
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Old 10-14-2007, 08:05 PM   #4
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Did you do any thing with the iac?
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flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 10-14-2007, 08:48 PM   #5
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it has to be something on the intake manifold side since you have to take it off when replacing the header...
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Old 10-14-2007, 09:22 PM   #6
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vaccum leak...
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Old 10-14-2007, 09:35 PM   #7
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Quote:
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vaccum leak...
yep vaccum leak ....check all vaccum lines.
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Old 10-15-2007, 03:51 PM   #8
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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!!
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Old 10-15-2007, 05:10 PM   #9
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It's definitely the gasket on your header. Something isn't sealing right. Try getting a new gasket and doing it again.
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Old 10-15-2007, 05:26 PM   #10
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2x. thats what i'm also thinking. Unless its a huge vacuum leak it should not be able to reach the redline.
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Old 10-15-2007, 06:59 PM   #11
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Unmetered air is getting in the induction side.......check all your hoses etc......chrysler 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
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Old 10-15-2007, 07:32 PM   #12
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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.
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 10-15-2007, 09:03 PM   #13
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do u have an egr valve? otherwise, im going with vac line
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Old 10-15-2007, 09:35 PM   #14
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I don't think a egr valve would cause that. And don't hink the 4.0 has egr. Does it?
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 10-15-2007, 09:48 PM   #15
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dunno if it has one or not, i have a 2.5, but one stuck open will make it rev....
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Old 10-15-2007, 10:06 PM   #16
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I know but not red line it.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 10-15-2007, 10:44 PM   #17
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whatever u say boss
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Old 10-16-2007, 08:24 PM   #18
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re: throttle body

When I start the engine it just starts racing! I watch the butterfly and it stays closed!!??? :-(
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Old 10-16-2007, 09:46 PM   #19
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Then you have a leak somewhere else you need to take a close look at all lines and gaskets etc.
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-15-2010, 11:21 PM   #20
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Quote:
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?
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Old 04-15-2010, 11:25 PM   #21
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Quote:
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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?
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Old 04-16-2010, 01:56 AM   #22
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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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