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I've heard the idle issues are due to the mapping of the TFI for manual cars allowing a polling rate way below 500 rpm. Everyone ARGUES over what they think are different O2 lines. Those Port EFi cars were churned out fast, so Ford did whatever it wanted to get 'em built. The so called sensor wiring change is effectively by loop wire to allow another previous configuration to be used. I think it's TECHNICALLY different based on transmission, but that's my A hole, um, opinion. The MAF 1990 Model Year Auto O2 wring loom is described in various ways. It's mind bending how freakin' awkward it is to find consensus on if any given O2 wiring loom is the same or different to your stock 5.0 1990 Model year application unless you've got great pictures. Those ECM pinouts allow an Auto and Manual wiring layout to be followed. Ive tried the same way to go over the PhotoBucket Is Dead links when looking at NAVYCAT's issues. I still plan to visit the stores that wanted me to call them, but hopes are not high. It seems that the bounty of these things that was available not that long ago has dried up. I hit up the websites for all the other parts store chains, and they pretty much alternate between "Call store for availability" (my FAVORITE!!)/"order online" greyed out, and "quantity not available" online/"order in store" greyed out. My harness DOES match the auto picture though. There was plenty of talk though of pin position and wire color changes throughout the years, so it won't be without drama. I guess I don't have much choice but to take his word for it. The page I got the photo from says it refers to a 1990MY harness, which is what I have. I need to move the purple/yellow jumper from where it is to the open spot. Here's what I could find, best that I can tell. NOT doing that, DON'T care, let's move on. Oh, and the fact that this is tied to converting speed density cars to MAF is great too.
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plenty of "Great job, Bill!" to sift through. Yeah, many of the posts go nowhere, many have tons of extinct photo links in them.