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Old 02-16-2013, 02:22 AM   #1
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Redline on startup

Hi,
I was wondering if anyone else has had this problem and if so how did they fix it. I have a 00 tj and when i start it up it immediatly redlines but when i watched the throttle body it doesnt open at all this may seem like a stupid question please bare with me still learning thanks.

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Old 02-16-2013, 07:12 AM   #2
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Have you done any engine repair recently? Sounds to me like a fairly serious intake leak or a cracked intake manifold if your TB isnt open. An easy way to find a leak is to get a can of brake clean, and start spraying your intake. I would start with the gasket area where it mounts to the head. If you do happen to spray the spot where its sucking air the engine will immediatly start to bog down. Just a suggestion. Good luck!

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Old 02-16-2013, 09:20 AM   #3
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Yes that is definitely caused by a big vacuum leak somewhere, usually around the intake manifold. Has the exhaust manifold been replaced recently?
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Old 02-17-2013, 12:15 AM   #4
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Yea I just recently had the intake manifold off i thought i had gotten lined up and sealed pretty well. But im gonna go bac and give it another try. Thanks for the advice ill let know how it turns out.
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Old 02-17-2013, 10:22 AM   #5
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Yep, for sure then that you didn't get the intake manifold properly repositioned after replacing the header which is very common. Take pains to get it properly positioned on the positioning studs on the head.
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Old 03-25-2013, 11:05 PM   #6
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Problem Fixed

Hey guys sorry it took me so long to get back on here but I figured out the problem upon further investigation ie: I took the intake manifold of only to discover the rear tab the post on the block sits in had been busted off so i replaced the manifold and all is well you were right it was a major intake leak thank you for all the help you guys are awesome

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