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Intake residue

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Old 03-26-2021, 04:41 AM
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Intake residue
What do you guys make of this on the right hand side of the intake? I installed BMS performance filters and just lately I've noticed that there's a lot more blow off like constantly gradual acceleration I hear blow off of course hard acceleration lift off you hear blow off but first and second gear specially if I gradually go I can hear it blowing off is this the return tube to the intake from the blow off valve? 2017 C43

Right hand side

Left hand side

Last edited by Freder8d; 03-26-2021 at 05:09 AM.
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Old 03-26-2021, 04:07 PM
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Looks like back flow from pcv valve. Can't wait for someone to open up the intake manifold and look at the carbon build up on the intake valves.
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Old 03-27-2021, 03:33 AM
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Originally Posted by stockbmw
Looks like back flow from pcv valve. Can't wait for someone to open up the intake manifold and look at the carbon build up on the intake valves.
What do you mean by that?
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Old 03-28-2021, 01:23 AM
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Originally Posted by Freder8d
What do you mean by that?
Oil doesn't burn clean, I'm sure that's what he means. I would definitely check on the PCV valve.
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Old 04-08-2021, 09:51 PM
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Cleaned my intakes today, exact same situation with build-up on passenger side inlet. Did you look into the PCV valves as recommended by others?

Also, any other symptoms from turbo build-up or acceleration that you think may have been caused by this?

I took a few OBD scans from before and was measuring slightly lower turbo boost and intake manifold pressure for my elevation. Also my long term fuel trims were slightly on the leaner side at about 3.1%.
Last edited by jonathan358; 04-08-2021 at 09:58 PM.
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