Replaced cracked intake manifold, now knocking at wot - MustangForums.com



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Old 08-27-2014, 11:41 PM   #1
kast1376
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Default Replaced cracked intake manifold, now knocking at wot

Need some educated guesses here! Recently replaced the intake manifold, and now when I go WOT, I get knocking. No knocking otherwise in any gear at any speed or at idle.

Any ideas?
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Old 08-31-2014, 03:46 PM   #2
JC316
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Why did you have to change the intake? Best guess is that you have a vacuum leak that's leaning you out and causing detonation.
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Old 08-31-2014, 05:56 PM   #3
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Vacuum leak! End thread.
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Old 08-31-2014, 09:34 PM   #4
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The intake cracked where the plastic joins with the aluminum cross over. Will start looking for a vac. Leak somewhere. Thanks guys!
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Old 08-31-2014, 09:37 PM   #5
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That sucks. Did you use new gaskets for the intake? All your hoses plugged in? Is the new intake itself alright?
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Old 08-31-2014, 09:49 PM   #6
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check the new intake for cracks as well, if u have acces to a vacum smoker thats your easiest way to find the leak.
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Old 09-01-2014, 03:08 AM   #7
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Quote:
Originally Posted by 99GTvert View Post
That sucks. Did you use new gaskets for the intake? All your hoses plugged in? Is the new intake itself alright?
All new gaskets, all hoses plugged in.

Uber, what is a vac. Smoker?

Edit: I wish I had access to a smoker! I really hope the intake isn't f%#ing cracked. If it is hopefully AM will replace it.

It's gonna be hard to track down. There is no issue at all until WOT, so I don't think the standard carb cleaner check will work.

Last edited by kast1376; 09-01-2014 at 03:17 AM.
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