Bolt went through Intake manifold?
Odd question, but I removed my engine cover recently and started the car. Well there was a pronounced hissing from one of the bolt holes in the intake manifold. This of course is causing a vacuum leak and the idle to jump around a bit. I'm guessing at some point someone used too long a bolt and punctured the manifold? This isn't somehow a design 'feature' right?
Once the cover is on and I have a bolt in, it appears to seal it and the car runs totally fine. Any issue with simply leaving it as is? On the plus side I suppose I can now run seafoam or other cleaners through there if i needed to clean the valves etc.. |
Take a picture with your finger on the bolt that's hissing. The OEM engine cover bolt locations cannot hiss because they're on casting protrusions that are outside of any airspace.
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It may be normal, the one below it does not take any bolt as the engine cover is only secured by one bolt in the center.
https://cimg6.ibsrv.net/gimg/g35driv...d9f773a5c5.jpg |
Ahhh I missed the part about it being an HR motor. I'm not too familliar with that upper plenum but just from looking at it it's definitely possible someone ran a longer bolt through and broke out the bottom of the casting. You would feel suction with your finger, if so then just add a rubber washer under the bolt or use a very light coat of teflon plumbing paste (don't recommend teflon tape) to seal the threads of that fastener.
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Thanks, i do have a rubber washer but can add some extra sealant on the threads although i dont think it leaks as is.
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Had same thing happen here. Didnt hear the hiss at first. I even did a throttle relearn. 1100 rpm is high compared to the factory 650 rpm. Im replacing valve covers before winter so I will see later whats under intake.
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