Asked by Feb 19, 2017 at 02:46 PM about the 2002 GMC Sierra 1500

Question type: Maintenance & Repair

Hi my 02 GMC Sierra z71 with a 5.3 has check
engine light on and code read mass air flow sensor
but I put a new one on and the light is still on and
it's running like it has no power to it and I have to
pump the gas multiple times to make it go  and the
code is still reading mass air flow sensor

1 Answer


Of course the air filter should be fine since your buying parts, The mass air flow code is most likely set off because of a vacuum leak or can also mean bad connections, failing or dirty components, dirty IAC, throttle body ect. I would look for a vacuum leak first, try to listen for it and see where it is coming from or anywhere extra air can be entering the system. The most common causes of the code P0101 are: - Dirty, obstructed or faulty mass air flow sensor (MAF), - Cracked, ripped or disconnected intake boot (snorkel), - Vacuum leaks (from stuck open PCV valve, leaking intake gaskets, etc.), - Clogged up or improperly installed air filter, - The mass air flow sensor element contaminated by excess oil from an oil-soaked air filter, - Clogged-up catalytic converter or restricted exhaust, Other possible causes include: - Dirty throttle body, - Bad or dirty manifold absolute pressure sensor (MAP), - Electrical problems with the MAF sensor connector or wiring, - Stuck open EGR valve, - Incorrect valve timing, - faulty engine computer (ECM),

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