hole forming inside of the PCV housing attached to intake plenum.

**Rick C** · 02-14-2009

I have a 2002 Grand Prix with 140,000 miles. Has anyone ever heard of a hole forming inside of the PCV housing? This hole isn't normal, right? As shown in the attached pic, the hole is between the PCV housing and the intake plenum. I'm not sure if the hole goes into any of the plenum chambers, but I noticed quite a bit of oil on the PCV valve.The car is giving a P0102 code (Mass or Volume Circuit Low Input) and a rough idle. I was told that the reference voltage for the MAF sensor is controlled by the MAP sensor above the PCV valve, making it possible for a faulty MAP sensor to create a MAF error code. I heard of many issues with these plenums, but not this. Any one know how this may have happen? I don't want to replace it and have it happen again.

**Scimmia** · 02-15-2009

That hole is normal and necessary. The PCV system has to be connected to the intake somehow.

**Rick C** · 02-15-2009

Well never mind on the hole in the intake plenum. I went to the auto parts store today and looked at a new one. It had a similar hole in it as well. The hole was much cleaner then the one in mine, that looks like someone poked it out with a screwdriver, and a small section of hose was visible, but either way this hole seems to be normal, and apparently the amount of oil I noticed was also normal. Still have the same code (P0102), so I guess I'm going to start tested the wiring to the MAF sensor and maybe try another MAF sensor. Thanks to those that viewed!
Any ideas?????? Engine idles good for a few minutes, then rpm's start fluctuating. After about 10 minutes the engine stalls.

**Rick C** · 02-15-2009

Thanks for the reply Scimmia, I guess I should have refreshed my screen before my latest post / update.

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