DIY Solution to M54-M52TU CCV problems

[Tutti57]

I just did this mod on my wife's x5 and now have a lean engine code. It smokes slightly at idle and my wife said the engine hissed for about a minute straight when she turned it off today. Does anyone else have high fuel trims with this set up? In using the same part # for the valve as the op.

[BavarianE39]

Originally Posted by Tutti57

I just did this mod on my wife's x5 and now have a lean engine code. It smokes slightly at idle and my wife said the engine hissed for about a minute straight when she turned it off today. Does anyone else have high fuel trims with this set up? In using the same part # for the valve as the op.

Sounds like you have a vac leak somewhere, mine does the "hiss" for maybe 1 second after I shut the engine off. Fuel trims are stable, and have not had any vehicle produce smoke after this mod, any chance you installed the PCV the other way around ?

[Tutti57]

I'll see if I can smoke test it tonight. I don't think I have it backwards since the fat side goes to the larger vc hose.