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I tried several ECU's and we are not sure what is unique about this car,but it would only run with the original. The Ebay seller I bought them from was great.

Update : After talking to a friend and former Ford dealer mechanic ,he suggested I look at the engine coolant temp sensor. As he predicted it was all corroded. I swapped it out with a new ford sender and have driven the car two days in a row to work and back with no issues. Not quite ready to...

Update: Tested then replaced the battery, still the same old stuff 20 minutes of driving and it bucks and coughs . Then if I can keep it running within many seconds the tach recovers and starts running smoothly again. In a conversation with a former ford mechanic he reccomended replacing...

Update. I spent an hour or more looking over the wiring and found no issues. I got thinking about the DIS and swapped in the ford preowned one I picked up on ebay. I swapped it in and the car ran an hour without a miss. I plan to drive it to work tomorrow as a test run.

Aftermarket ... I did buy another pre owned DIS Iwill try that one this weekend

Yes, I replaced the DIS a third time a few weeks ago. Cleaned both surfaces and coated both part and mount with new paste

Here is where I am at today. I have replaced the the cam sensor and DIS unit first. runs the same. Starts smooth then 20-30 minutes it bucks and tach goes to zero. I then replaced the crank sensor ,same old issue. Ran in my driveway for 30 minutes then started same old stuff. (it starts the same...

Thank you for your insights. I had not considered the stator.The company I got the ECU from is going to exchange the one I just got (that ran worse) with another. Here's hoping !

No, at this point I am throwing parts at it. As far as I can tell this (the ECU) is the last in line.

Iw ill pull it outside tomorrow and check that idea

I'm sure it still does that. Thats the only consistant part of the cluster.I have not tested that.

I bought a reman ECU and installed it Sunday, car would not stay running,belched out tons of smoke. I put the original back in and smooth running. Not sure if the reman is faulty or was sent the incorrect one ?..

Thank you ! I will update after the install

Where is the ECU exactly ? Alldata says rt front kick panel. Is that correct ? thanks !

I replaced the crank, cam and DCM still the same. I have a PCM coming

Thanks for all the ideas ! I will start by going over all the wring I can see to make sure its ok. Also will check the gound.

Backround I bought this car new in 1990. 1989 Thunderbird SC Never been in the snow (I live in Michigan) Only driven in the rain a dozen or so times. This issue started a few years ago. I only drive this car once in a while. After driving for 20-30 minutes the tachometer drops to zero and...

Hey fellow SC folks, I'm the original owner of an 89 SC and while replacing the crank sensor one of the bolts snapped off. Does anyone have the bracket for sale ? Part number E9SE-6C355-ab ? Thanks in advance Dave

thanks Thank you so much ! Our tech that is doing the repair for me still has the socket from when my car was new,,,,,, I am a body shop estimator at a huge Ford dealer in Michigan,but I think we only have 3 guys still turning wrenches that were here when my SC was new. I really appriciate...

And it is a direct replacement ? 5 wire I think ? THANKS !!!