My autotap says I am throwing a p100 code. So, I check the wiring going to the MAF. 13.0 volts from the Battery, and 5.00V reference so that is good to go. My MAF is practically brand new, I bought a GMS MAF and I'd say it dosn't have any more that 3-5,000 miles on it. I took it out and cleaned it with alcohol and q-tips just to be sure and still I am getting p100 and a air fuel ratio of 14.2:1 What the hell could it be? Any ideas?
Thanks,
Tony

 

Hopefully you still have the oem maf, install it and see if that clears up the code.

 

No I don't. . .

 

I had a same problem with my stock unit. It turn out to the connector. The little sockets were not tight enough around the pins in the maf unit. If you take a sewing needle you can get the wires out of the connector and use needle nose pilers to squeeze them a little smaller so when the connector is connected to the maf they make a snug fit.

Just a thought.

 

I also had the same problem also fixed the same way.
T/aTony,try pressing on the connector/wires while the engine is running this should set off the code. If it does you know that is the culprit.