1989 Other Oldsmobile Models

I looked for the MAP but I'm not sure where it is. My Chilton's shows a photo of MAP apparently mounted on the firewall, but I see nothing like it.

Car is Oldsmobile Delta 88 Royale 1989
VIN 1G3HN54C5KW341075
3.8L V6 Fuel Injected 4-door H model chassis

I got a used MAF sensor. No change. But who knows if the used one is any good.

But in the meantime I did a little science project. I disconnected the wires from the MAF sensor. The car runs fine, even when warmed up! No stalling! (I'm getting code 34 of course.)

Who knows if the acceleration is still the same, or the gas mileage, or if the emissions are correct. But no stalling! And state emissions inspection is 16 months away.

I think what is happening is that the computer uses two inputs to decide on how much gas to inject: the throttle position and the MAF reading. When the MAF sensor is disconnected, it just uses the throttle position as a first approximation, which works better than using garbage results from a bad MAF sensor.

Next research question: what is the gas mileage with the MAF sensor disconnected? Stay tuned.

Running with the MAF disconnected worked well for a while, but then it went back to stalling.

Got a used MAF. There was no change in the car's stalling. Using an ohm meter, I measured something like 50 megohms between each pair of pins. Same thing on both the old MAF and the replacement.

Finally I got another used MAF, and it fixed the stalling problem. This good one had much lower resistance between the pins marked + and -. About 6 K Ohms in one polarity and about 500 K Ohms with the probes reversed. The other pin had much higher resistance.

The part number on the MAF sensor was AFH50M-02A.