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Old 11-08-2015, 08:26 PM
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Help with Cylinder head replacement issue

Have a 2001 TJ 4.0L. Replaced the cylinder head, everything seemed to be ok. Didn't make any mistakes that I thought. Started immediately, but yet now I have a high RPM around 3K. Could it be an air leak at the manifold probably? Whats the best way to tell?

Any help is greatly appreciated. This is my daily driver.

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Old 11-08-2015, 08:44 PM   #2
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Most likely a vacuum leak at the manifold

Many have this issue when replacing the manifold as they either forget to tighten a couple bolts or don't align the gasket properly

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Old 11-08-2015, 10:15 PM
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Thats what I was thinking, but glad someone else potentially affirmed it. WIll look at it tomorrow and try to get it right. Quick question do you think, RTV high temp sealant is good to use in combo with a gasket? Thanks
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Old 11-09-2015, 03:31 PM   #4
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Make absolutely sure the manifold is seated on the locating dowels before torquing down and no, no RTV needed.
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Old 11-09-2015, 03:39 PM
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Will do! thanks for the advice. From what I've been reading seems to be the trickiest part of doing a swap.
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Old 11-09-2015, 03:52 PM   #6
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Quote:
Originally Posted by m2b1969 View Post
Will do! thanks for the advice. From what I've been reading seems to be the trickiest part of doing a swap.
Yep for sure. If the reseating of the intake manifold job is rushed or not done with due care, you'll have a big vacuum leak... sky-high engine RPMs when the engine is started will be the result.

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