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99 Grand Prix GT 3.8L 85,000 miles
I'm having the same issue. I installed a refurb MAF sensor yesterday. It was refurbed by CarDone. Ran the car for about 20 miles with no issues. When I started the car again, the RPM's fluctuate afrom 700 to 1500 then stabilize, then the SES came back on. The RPM's start to fluctuate again after I rev it. The fluctuating RPM's has been intermittent. I'm getting the P0102 code as well.
I've been measuring voltages on the MAF connector.
Connector disconnected from the MAF, yellow wire: 5V
Connector connected to the MAF, yellow wire: Had 2.62V, now 11.5V w/ the engine running
Connector connected to the MAF, yellow wire: 10.3V, key ON, engine off
I''m wonding if 2.6V on the yellow wire is normal. With it at 11.5V, the RPM's are fluctuating.
Chilton's talks about reading the MAF frequency using a scan tool. I don't have one so I tried reading it with a DMM. My DMM has a frequency counter function but I'm not picking anything up on the yellow wire. I' don't know if I can read the frequency this way.
Anyways, I'm interested to see what the normal voltages are on the MAF when it's connected. I'm wonding if I have a bad MAF or a wiring issue.
I also seen in Chilton's that the TPS could cause a MAF issue. They say it should read ~4.8V at full throttle, I'm only getting 4.11V. Could this be a possibility as well. Also, my car only has ~ 13.9V while running. Thats a little low.
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