Leaderboard

1) My original ECM looked brand new and only had 20K miles on it. But it kept giving the dreaded E042. Manual said to replace it. 2) The first one I received from Blue Streak on Rockauto acted totally strange. It set off chimes for no reason and made the throttle go crazy. Car wouldn't run unless I kept foot on the gas. 3) Second Blue Streak "remanufactured" ECM from Rockauto was corroded inside. I didn't even try that one. 4) Fourth ECM from Swanauto (I assume is a salvage yard) looked like it got run over by a truck, but it worked beautifully and I haven't had a problem since. Code E042 is gone. As you can see, it took four tries to get a good ECM but I eventually got lucky. Since you purchased it on Ebay, you should be able to let the seller know it didn't work and they will send you a replacement at no charge or refund it so you can buy another.

Unplug the MAF and try it.

Did you get a few sparkplug wires crossed? Thats the only other thing I can think of.

I'm almost there myself. I still do it but my body is starting to say no. Working on the Mustang to get it into great condition has been harder on me than I expected. All I still have to do is change the oil in the differential and hopefully I will be done working on it for a while. I think it will be the last car I ever buy to work on myself.