I was looking around at different MAF sensors and noticed that some manufacturers list the same part number from 86-89, while others show a separate listing for 86-87 and 88-89. AC Delco shows 213-163 for 86-87 and 213-3418 for 88-89. Standard Ignition MF4712 covers 86-87 and MF5877 covers 88-89. Yet Cardone's 74-4712 covers 86-89. Aftermarket units that do not use the heated wire list one part number for 86-89.

Is there some subtle difference in the electronics? Does the change over have to do with the change in relays to the oval style? I can not see any differences in the external case. But there clearly has to be a reason they would list different part numbers for different years.

I have used both and did not notice any difference in performance. Is there any reason to chose one over the other?

 

All MAF sensors work in the same manner. Except for the adjustable ones which I believe control the heated wire. Get a Bosch. Its cheaper and its really what you need.