Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
i am sorry for the long wait
with the MAF unplugged and a meter set to DC volts with the key ON red meter lead into the pink wire terminal and the black meter lead into the black/white wire terminal in the connector what does the meter read ?
most are disconnected to move the wiring harness out of the way and the MAF is unplugged and removed with the air hose to the throttle body to access the distributor
you are looking for 12 volts at the PINK terminal with the key ON and most important the black/white a GOOD ground
my concern is the black/white will not be a good ground and the ground for that black/white wire is on the back of the drivers side cylinder head which is a common ground to break or leave loose or forget to put back on during an engine swap
you can get the distributor in correctly without the MAF as these distributors are dropped in on TDC and aligned that way
there is no timing to set once dropped in correctly
and that ground at the back of the drivers head is clean and tight ?
if your sure that ground is good key ON engine OFF with the MAF plugged in what does the computer show the MAF reading ?
what codes is it setting ?
ok we need to know the code number it is setting and we need to see what the MAF is reading in the computers live data list
can you barrow or rent a scan tool to see what the MAF is reading in the computer ?
this hear needs to be followed
The Mass Air Flow (MAF) sensor is an air flow meter. The control module supplies the MAF sensor a signal circuit. An ignition positive voltage circuit and a ground circuit are supplied to the MAF sensor by independent circuits. The MAF sensor heats a wire element, or grid, within the MAF sensor in order to maintain a calculated temperature. As inlet air flows across and cools the grid, the MAF sensor increases current flow to the grid in order to maintain the constant grid temperature. The MAF sensor converts the grid current flow into a frequency signal. The control module converts the MAF signal frequency into a grams per second value. During low air flow rates, such as at engine idle, the MAF sensor produces a low frequency signal. During high air flow rates, such as at wide open throttle-road load, the MAF sensor increases the frequency signal. The control module monitors the MAF sensor signal frequency in order to calculate the flow and mass of the air entering the engine.
how are you making out ?