Mass air flow sensor

Asked by Beaux1110 Sep 10, 2020 at 03:01 PM about the 2003 GMC Sierra 1500 Work Truck Extended Cab SB

Question type: Maintenance & Repair

I drive a 2003 GMC Sierra 4.8l v8. When my mass
air flow sensor is plugged in, my rpms jump up and
down and I have virtually no power. When it’s
unplugged, it runs fine, but no gas mileage and it
idles kind of low. I replaced my mass air flow
sensor, my throttle body And idler control... the only
code my truck throws (aside from the MAPs being
unplugged and plugged back in) is for my injector
circuit. All of my injectors are good, and all the
wiring and grounds are good.. I don’t know if that’s
the problem with my MAPs sensor issue or not. I’ve
been to a dozen shops within a 250 mile radius and
I can’t find anything that can tell me anything.
Anything is appreciated.

1 Answer

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