My 91 318 with of course the M42 engine starting dying on me, luck was with me as I was just about pulling into my garage. An examination of the check engine fault code indicated the the AFM.
Looking for the cause I was suprised to find that in between the factory connector and the AFM there was an extension . Not pin for pin this thing looks factory and has male/female round connectors. But when I peeled back the rubber boot it has about a 3/4" square black encapsulated juntion where some alteration of the wires going from point a-b occurs. One of the pins at the AFM becomes a no connect and there is now some measured resistance betweeen two other. The cause of my problem was a broken wire in the factory harness/connector which I repaired.
The car runs fine again and the check engine light is off. I reconnected the pigtail extenision since it has been there all along. But what the heck is this it. I'm thinking maybe a factory upgrade or it's some kind of aftermarket item.
Can anyone shed any light on this thanks
Topic: What is this thing HELP - pigtail on AFM (Read 2149 times)