Repair

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

20,955

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),

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,450
  • #2
    John Saffrahn
    Reputation
    3,760
  • #3
    Glenn Clingenpeel
    Reputation
    3,450
View All

Related Models For Sale

Used Chevrolet Silverado 1500
184 Great Deals out of 11,611 listings starting at $1,700
Used Ford F-150
660 Great Deals out of 13,636 listings starting at $3,000
Used Toyota Tundra
50 Great Deals out of 1,430 listings starting at $2,500
Used Chevrolet Silverado 2500HD
12 Great Deals out of 1,309 listings starting at $4,995
Used GMC Sierra 2500HD
25 Great Deals out of 1,345 listings starting at $3,990
Used Toyota Tacoma
41 Great Deals out of 1,143 listings starting at $7,950
Used Dodge Ram 1500
52 Great Deals out of 505 listings starting at $3,488
Used Chevrolet Tahoe
7 Great Deals out of 801 listings starting at $3,995
Used Ford F-250 Super Duty
34 Great Deals out of 959 listings starting at $2,475
Used GMC Yukon
9 Great Deals out of 959 listings starting at $2,500
Used Chevrolet Camaro
916 listings starting at $12,000
Used Cadillac Escalade
3 Great Deals out of 494 listings starting at $4,980

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
7,485 listings starting at $29,309
2017 GMC Sierra 1500 For Sale
15 Great Deals out of 1,904 listings starting at $399
2016 GMC Sierra 1500 For Sale
27 Great Deals out of 270 listings starting at $22,995
2015 GMC Sierra 1500 For Sale
67 Great Deals out of 589 listings starting at $20,998
2014 GMC Sierra 1500 For Sale
38 Great Deals out of 454 listings starting at $17,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.