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Originally Posted by gtengr
Removed the MAF, cleaned it (didn't appear dirty), and the car runs great again. I get the feeling this isn't over though. Why would a MAF with 11k miles on it (always stock airbox and filter) be dirty? Are the oil vapors from the PCV able to travel upstream during certain throttle conditions and foul it?
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The P0172 came back with the rough running, and again a little MAF cleaner on the MAF and the car is back to running smooth.
I think the restrictive stock filter plus the air the supercharger is trying to move with the hbp and CS400 is creating a lot of vacuum in the intake tract, and possibly pulling extra vapor through the crankcase and/or PCV hoses. I can't think of how else the MAF would be getting dirty. I went to swap the stock air filter for a high flow one, but was sent the wrong part so will have to wait again to test. I'm kind of glad the part was wrong because the air filter is smaller than I was expecting (measured ~9.3" x ~4.5" = 41.6 sq in, I was expecting ~50 sq in, ignoring the pleats), so I'm going to need a CAI regardless.
Quote:
Originally Posted by Kodename47
I've gone Airaid on the Sprintex. As this uses the OEM airbox too, it can be made to fit and no bumper removal required. I think the Skunk2 offering could be made to work as well. Most other intake kits move the MAF to the replacement tube so aren't an option.
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I think I'm going to go with the Airaid as it looks to have more filter area than the Skunk2. Is the Airaid inlet connection in the same location as stock or is extension/trimming required?