MAF problems??

[jasjamz]

Car ran fine with the stock MAF. Now the car is not accepting known good maf's. I placed a voltmeter on the signal wire with the key on engine off. After about a minute and a half the voltage is not steady at 2.5 volts or so anymore. It starts pulsing between 1 volt and like 3.6 volts. The led bar at the bottom of the meter looks like its rising and dropping to a steady drum beat. During idle it will sometimes drop to 6 on the scanmaster and start to run crappy or die. If i slowly bring the car up on boost on the foot brake, at like 3-4 psi readings will jump to like 128 and the start running real crappy and puffing black smoke(over fueling). I did the Vortex buick flow chart and came up with a bad sensor or connection. Car has a caspers harness witch is fairly new and my signal wire is gray with a red tracer instead of yellow. Anyone ever seen this?

 

[mikestertwo]

You really can't tell what a MAF is doing with a volt meter. The MAF sensor puts out a frequency proportional to air flow. You would have to put a scope on it to see what it is really doing.

 

[jasjamz]

Ok gottcha. But at the Vortex site it says that KOEO you should have 2.5volts at the ECM connection for the MAF signal. Mine fluctuates pretty bad after a minute or so of KOEO. Is this normal?