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Topics - hjbjzj

1
Engine Swapping / 87 T-bird W/92 5.0 Swap High Idle
Bought a 1987 Thunderbird for my brother. The car was originally a 5.0 non-HO. The previous owner swapped in a 5.0 HO out of a 1992 fox body and a AOD trans. He also swapped in the A9P eec without doing any harness changes. The previous owner never did the MAF conversion to the 87 harness and could not get the car to run right.

 So when I picked up the car, instead of wiring in the MAF, I decided to pick up a 1987 auto mustang EEC (DC model) in hopes it would match the speed density harness the car already has. The car started fine but has a high idle of 1200 rpm. If I disconnect the IAC the idle drops back to normal (750 rpm). So I replaced the IAC twice now with the same issue. I replaced the MAP, same issue. Ive adjusted the TPS. Did an idle reset procedure, when I kicked all the accessories on (head lights, radio, A/C) the car idled rough and quickly stalled out.

 The car does not spit out any codes. Ive done the old school way with the test light and jumper wire and get nothing at all. With the key off I get a steady 1 light every few seconds. key on gives me nothing. With a snap-on scanner hooked up, its does not communicate with the car. Fiddling around in the engine bay I found some loose grounds. I tightened them and added an extra ground from the battery to the a/c bracket. Thinking the DC EEC is bad since it would not communicate with scanner or jumper wire, I had a local ECU remanufacturer test it out and it has tested GOOD.  Is the "DC" eec the right computer for the job?

 Im lost at where I need to probe next. I need to get this car running asap.

 Am I missing something in the harness. Is the EEC harness different from a 1987 tbird to a 1987 mustang? Do I need to change some pins around?

 Please help. sorry for long post. Thanks in advanced