Engine Bay Sounds

[rguti153]

Oh k lol gotta ask shiaaatt

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[Oli77]

Thanks all for the responses. WP was replaced OEM about 3 years ago and has about 25K miles on it.

I can feel the sound over the center of the engine (all over the valve cover) not more so towards the VANOS. Definitely nothing over to the intake side.

I placed a wood-stethoscope over the VCG bolts and can hear metal sounds transfer. That sound is not louder toward the VANOS (could still be it though).

I would love this to be the idler pulley but it sounds like its throughout the engine more so than the front.

I thought VANOS sound was more like a rattle. Also, would my MPG be bad if VANOS were the culprit?

[328ioc]

The normal audible VANOS sound is a rattle correct.

Hmmmm so maybe an issue with the exhaust can?

How does it run and drive other than the noise?

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[Oli77]

Run and drives and pulls well I think. MPG at 23.7 in city.

Yes maybe cams. But their "timing alignment" is driven by the VANOS correct?

If i increase RMP, obviously sound increases in rhythm.

[WOLFN8TR]

Definitely sounds like its at the font of the engine.

My guesses are VANOS, water pump or pully/idler related.

I think if it was actually something with the pistons you would notice some more issues.

That was my guess as well.

[SoarinZHP]

My guess would be a/c compressor / clutch?

[rguti153]

Why u say ac compressor ? Just wondering

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[Hornung418]

Wow. Thats definitely piston noise. Not a bearing or a vanos rattle.

Oli, pull your MAF Oli and see if the noise goes away.

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[Oli77]

OK. So start it up and then remove maf connection? Or remove maf and start it up?

[Hornung418]

OK. So start it up and then remove maf connection? Or remove maf and start it up?

Either, or. The result should tell you weather or not its a fuel related issue. Sounds like you're knocking. No shadow codes?

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