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Originally Posted by 86GT
What a bout a loose connection on the TFI to EEC. Look at pin 16, 36, 56. Make sure there is no corision and so forth. I would slao check the shield wire. It is supposed to be grounded.
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I concentrated a lot of my "loose wire testing" around the distributor/TFI module with no luck. I've tugged and tapped on the TFI itself with no luck in reproducing the problem. I have also inpected the EEC connection when I swapped computers, but didn't notice anything unusual.
What really throws me off is why the ECT drops down and slowly climbs back up.
I thought it could be the ECT sensor dropping out and some how causing the EEC to do weird stuff with the timing. I tried pulling the connector while the motor was running, but the datalog just shows the ECT staying at the same position it was in. I bought a new sensor to try, but I haven't put it on yet.