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Old 05-18-2010, 12:54 PM   #1
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throttle issue?

On my previous thread I spoke about how I replaced my exhaust manifold and thought that I didnt have my intake manifold fully seated upon reintallation. I have since redone the job and reinstalled the exhaust and intake manifolds. My jeep still ramps up to 5000+ rpms like it is at full throttle or something.

I dont think this is an issue with my manifolds anymore, I do not believe that a small leak from my intake would cause my jeep to go full throttle.

I think there must be something up with my fuel injectors or something causing them to go wide open. What could be causing this? My jeep instantly goes full throttle. I dont see any visible damage on the fuel injector electrical connections. Do I need to reset whatever controls the fuel injectors since I had disconnected the battery before this work?

Any help on this would be greatly appreciated because I am stuck on this, and now I cant drive my Jeep....

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Old 05-18-2010, 01:06 PM   #2
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Did you reconnect your vacuum hose to your brake booster?

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Old 05-18-2010, 01:12 PM   #3
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yes, i reconnected that. I have been staring at this thing for hours now, as far as I can tell everything is reconnected where it should be. I carefully labeled everything when I took it off.

I will go take another look.
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Old 05-18-2010, 01:17 PM   #4
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Maybe take some pictures of engine area so the folks here can maybe help out just from looking at things.
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Old 05-18-2010, 01:47 PM   #5
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Here are some pics, I can take more if there is something else someone wants to see.
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Old 05-18-2010, 06:12 PM   #6
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Remove the intake tube from the throttle body and see if it is closed when the engine is reving that high. If it is closed, there is a leak. Engine needs air (not just fuel) to rev that high.
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Old 05-18-2010, 06:37 PM   #7
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If it was the injectors going wide open like you said, it would be too rich and stall.
It's outside air getting in somehow.

I'd do the propane trick - it'd find it within seconds.
Get a cheapie propane torch, take off the nozzle - the tip, and remove the tiny orifice inside. That just leaves it as a valve.
Slip a hose over the end.

While running, gingerly spray the propane around where you think there may be a vacuum leak.
Try around the base of the throttle body, hose connections etc.
If there is air leaking in it will profoundly affect the RPM.

Then spray some along the intake gasket on the top side. Now go under it, spray along the intake manifold where it attaches to the head. I'd bet it's still leaking there.

You could use a carburetor cleaner, but most now don't burn, they are water based. Water won't make much difference, it won't do what you want.
Plus they are dangerous. When you spray it around it forms puddles. If it ever were to ignite you have a nice fire. Staring fluid has burned down more vehicles than you'd imagine.

Propane will burn in the cylinders like a low octane gasoline. It will not harm the engine or anything else.

Since propane is a gas it doesn't make puddles, and it dissipates quickly. In case it did ignite - it flashes, scares hell out of you, then it's out - no lingering fire.
That's what the professional shops use.

Keep it off the distributor!

I know "it can't be that" - try it anyway.
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Old 05-18-2010, 06:42 PM   #8
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A small intake manifold leak can indeed cause high rpms like that. Rrich's technique is what to try but I'm still betting the intake manifold is not yet seated against the head properly.
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Old 05-19-2010, 10:50 AM   #9
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Jerry, I read your comment and also saw what you posted on another thread about 99.99999% of the time its the intake manifold. So I took it apart for a third time. This time I left the exhaust manifold loose while placing the intake manifold and it popped right into place. I knew as soon as it went in that it was right. Engine runs fine now, I will retorque the bolts in a day or two.....

Thanks alot guys.

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