GREAT info on MAF and Air/Fuel Ratios

[Craig99SE2]

Everyone should read this article!

http://www.vetteguru.com/mods/howto/

It has some great info on porting the MAF, GMS, fuel trims, air/fuel ratios and how they all relate in GM PCM's. Yes, it is geared for the C5 Vette, but the OBD-II PCM is not that much different than our cars ...

[cavingman]

wow, i thought our pcm was inconvenient to get to...

[The Old Guy]

Yeah....I knew all that stuff!! lol

The one thing that Pro M advises against though which is contrary to this article is the use of an inverted cone filter. They've found that using it in conjuction with a MAF without the screen will cause irratic air flow and cause the MAF to give false readings. I know from experience that my car doesn't idle or run as smoothly with the inverted cone as it does the regular cone.

Good article :thumbs:

[Sternie]

Originally posted by The Old Guy
Yeah....I knew all that stuff!! lol

The one thing that Pro M advises against though which is contrary to this article is the use of an inverted cone filter. They've found that using it in conjuction with a MAF without the screen will cause irratic air flow and cause the MAF to give false readings. I know from experience that my car doesn't idle or run as smoothly with the inverted cone as it does the regular cone.

Good article :thumbs:

Really? I ordered an inverted top filter.. but if my idle would be rough and my MAF giving false readings.. I might not want this after all. (Screen is still on the MAF though)

[The Old Guy]

I had no problem at all with my stock MAF and the inverted cone...it was only when I went to the aftermarket MAF without the screen that the engine idled rough. The inverted is fine with the screen in place.