My vote is the a bad MAF. The wiring checked out ok. I have tried everything to make this MAF work, but it doesnt. Pretty much no matter what I do I get NO readings from it. No IAT, no HZ frequency when running. They did not even try and help on the phone, and when I sent it in, they just said it works, no trying to figure out if I am doing something wrong or what. I would just throw it in the trash, but I feel like I am throwing a $500 bill in the trash, eventhough that is pretty much what I did by buying their product. IF ANYONE IS LOOKING FOR A ABACO MAF, LOOK AT SOMETHING ELSE. If it was a good part, they would at least stand behind it. Go figure, I am sure they won't be around for the long haul.