Does anyone have a VIDEO showing how to remove and replace a MAF sensor on a 1985 Trans Am 5.0L F.I.? If so, could you please share??

 

I don't think you need a video, just a screw driver and socket set. Use the screwdriver to loosen the air ducts on each side of the MAF sensor, then use I believe a 10mm socket to remove the 2 bolts holding in the MAF sensor bracket from the radiator support area, then carefully unplug the sensor at the bottom and remove. Now just disconnect the sensor from the MAF bracket that is held on with 2 10mm bolts. Word of caution on new MAF sensors, most aftermarket ones do not work that well, if at all, on these cars other than maybe the Delphi (I had one work well and another that gave high readings).

 

Thanks!

 

Bear in mind that the 1985 Delco MAF operates differently than the 1986-1989 Bosch MAF. Despite what many internet sources may indicate to the contrary, they are not interchangeable.

The 1985 AC/Delco MAF generates a 5VDC square-wave output that is modulated in output frequency based upon the measured air flow. If measured with a generic voltmeter, the voltage will appear to vary due to the RMS averaging of the meter and duty-cycling of the output. This would give the appearance of an analog output. If you use a true RMS DMM (like a Fluke 8026B), the voltage will remain steady at around 3.0-4.0 VDC. But the ECM input ignores the apparent voltage variation and counts the number of pulses directly, rather than converting them to "counts" internally. If the MAF output is checked with an oscilloscope, the waveform is a variable frequency square wave at about 50% duty cycle that peaks around 5VDC, and that reveals the TRUE operation mode of this early Delco MAF.

In 1985-1/2, Delco released new 16-bit ECM (1227165) with internal A/D converters to accommodate the Bosch analog output MAFs which GM purchased to make the system work. The Bosch analog MAF generates a variable voltage signal (analog 0-5VDC) that the ECM accepts and translates into a digital number of "counts" using that internal A-D converter. The MAF output voltage increases as the measured air flow increases. If the output signal is measured with an oscilloscope, the trace is a pure DC line that varies in voltage with sensor measurement.

 

Good catch, so he really needs to find a used Bosch from an 85’s because of the first year TPI differences?

IIRC there is a 85’ MAF on eBay currently.

These cars are very sensitive to differences in MAF from what I have seen with my car it runs better with the Bosch and the data scans back it up.