[Fwd: New member needs help]

[soren]

>Its an aftermarket chip but the stock one reacts the same way.  Everyone I
>talked to says that there is no reason the ECM should leave PE mode at that
>voltage.  Something else my be causing it.  The guy who made my prom,
Fastchip,
>suspects the MAF.  He said the ECM will substitute values it thinks airflow
>should be when the MAF is bad.  He also told me that swapping out MAF's is
the
>only way to tell.


    Here is a trick I learned working at the Buick garage:  clean the MAF
sensor.  Many times a car would come in with a lean kind of misfire while
accellerating; often it would happen even while revving the engine in
neutral.  While actual MAF values would look ok on the scan tool, you could
pull the sensor out of the housing and look at the wires.  There can be gunk
built up on them, usually from using a cheap air filter.  Some brake cleaner
takes the build-up of of the wires, and away you go.
    Considering the price of a new MAF sensor, I would definitely check the
condition of the sensing wires before replacing.

Soren