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

Your Answer:

Related Questions

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,850
  • #2
    dragonflyoffshore
    Reputation
    11,810
  • #3
    John Saffrahn
    Reputation
    11,720
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Silverado 1500
231 Great Deals out of 5,909 listings starting at $2,975
Used Ford F-150
321 Great Deals out of 13,751 listings starting at $1,712
Used GMC Sierra 2500HD
25 Great Deals out of 1,495 listings starting at $8,000
Used Toyota Tundra
36 Great Deals out of 1,350 listings starting at $6,255
Used Chevrolet Silverado 2500HD
27 Great Deals out of 1,242 listings starting at $9,500
Used GMC Yukon
14 Great Deals out of 898 listings starting at $4,555
Used Toyota Tacoma
50 Great Deals out of 1,081 listings starting at $9,998
Used Dodge RAM 1500
4 Great Deals out of 63 listings starting at $3,000
Used Chevrolet Tahoe
14 Great Deals out of 904 listings starting at $12,900
Used Ford F-250 Super Duty
17 Great Deals out of 1,169 listings starting at $8,995
Used GMC Canyon
29 Great Deals out of 1,240 listings starting at $5,995
Used Chevrolet Colorado
36 Great Deals out of 1,590 listings starting at $4,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.