1999 gmc 4.8 mass air flow

Asked by David Jan 04, 2015 at 06:54 PM about the 1999 GMC Sierra 1500 SLE Extended Cab LB

Question type: Maintenance & Repair

I believe my mass air flow is going? when I start the truck it is searching for idle and will stall.
is this a sign of the maf going?

1 Answer
200,965

dandyoun answered 9 years ago

Maf sensor should cause your check engine light to come on. But if no check engine light I would consider dirty/faulty idle air control valve or dirty throttle plate. The iac will not always thro a check engine light code.

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