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Discussion Starter · #1 ·
We did a swap from a 1990 Thunderbird sc on my 1995 mustang. The problem is that when we press on the throtle it trys to dieout and when we let go it gose to idle and it just turns off anyone have any idea or sugestion would
 

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You should take it to someone who knows how to tune cars. I can't think of how many times I hear about someone who has done a big build up and the car does not run well at all because they did not get the car tuned right.

Which brings me to a question, did you use the ECU out of the Thunderbird or stick with the Mustang ECU? That could be the problem if you didn't change that too?
 

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No left the mustang every whier i read siad it be ok or better and yea a tune shop sounds like my only option now
Yeah taking it to get tuned is your best bet then, but be prepared though some of those places that do tuning for this kind of thing charge a lot of money. Good luck.

Also I know of a guy who did this swap, if you are going to do any bolt-ons after this do not do under drive pullies, you will be going through head gaskets left and right.
 

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I can tell you why its not running right 100% guarentee its the ecu.. You cant run a thunderbird engine on a mustang ecu its like trying to run imac on a windows itll boot up but nothing will work right.. The mustang ecu is tuned to completely different spec than a thunderbird. You will also need all the thunderbird wiring harness or else sensors will be overlooked which will also cause rough idling. Get the thunderbird ecu i guarentee itll run great
 

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Yes you will need to swap the entire ecu its a silver box above where the passenger would put their feet get all the harnesses from the tbsc ecu and start rewiring.. Itll take a wile but when its done it should run smoothly.. Get a wiring diagram for the ecu and splice in wires to the harness as needed
 

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Discussion Starter · #12 ·
Ok thiers onother tbsc at the junk yard where i got the engine from that i can get the complet harnest becuase the one that i got with the engine i cut to conect with the mustang harnest.

So when i put the harnest do i have to use the intierer wiring to and would it be prety close too the same wiring
 

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Ok thiers onother tbsc at the junk yard where i got the engine from that i can get the complet harnest becuase the one that i got with the engine i cut to conect with the mustang harnest.

So when i put the harnest do i have to use the intierer wiring to and would it be prety close too the same wiring
It should be simular get a wiring diagram for both and see how they match up
 
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