2003 Chevy Tahoe MAF sensor

2WOLFGANGS

MEMBER
2003 CHEVROLET TAHOE
V8
4WD
AUTOMATIC
126,937 MILES

I recently asked about some engine codes P0101, P0171, P0174 and P0300. I have already changed the O2 sensors and last night I changed the MAF sensor as instructed by 2CarPro Jack and cleared the codes. It seemed to do the trick until my wife drove it to work this morning. She said it started trying to stall and is running rough again, but no check engine light is on. What is your next suggestion? Possibly checking the rubber seals around the MAF sensor for cracks? I sent another donation through PayPal. Thanks.

1 Reply

FLEXY5

MECHANIC
512 POSTS

Typically P0171 and P0174 codes are lean condition codes. In my personal history the number one cause of these two codes is a vacuum leak. If the vacuum leak was bad enough it would also cause a MAF code. The engine believes (based on TP and O2 signals) that it should be sucking a certain amount of air. If there is a variance in the readings that the computer calculates it ought to have and the readings the MAF is sending, it will flag a code. My suggestion would be to look for a large vacuum leak such as a colapsed PCV hose. This would also cause the stalling and rough running. Vacuum leaks cause the computer to be in conflict with itself. Check all your vacuum lines and post back with your findings. I would be happy to help you further if needed.
Dave