Hello again,
Thanks to those who helped with my questions last time pertaining to a friends car I'm helping setup. It's a Chevy Vega with a 92 S10 2.8 v6 and stock control system.
Anyhow, the car was running great last year with the stock 2.8, I helped him switch to a 3.4. In getting the car to start yesterday for a break in tune and the new motor, nothing would turn on- no check engine light, fuel pump prime, etc. All of a sudden sitting in the car, having touched nothing, the pump primed and the CEL came on, while smoke poured out of the top of the ECU! I immediately hit the battery kill switch, but it was too late, the ecu was toast. Opened it up to find every ground trace on the ecu Melted! The only thing wrong with the car we found was a ground strap he forgot to hook up in the engine bay. This wire was the main ground wire for the ecu, D1 (TAN/WHITE) on the large ECU connector.
Im picking him up a new ECU from the junkyard today and re-solder a G2 adaptor into it. I just want to ensure this doesn't happen again! Any insight? All the rest of the harness was 100 percent ok, minus that ground lug undone and just resting there. Could that actually cause the ecu to fry, when it has to take all it's current through the case and foil traces? Why didn't the fuse blow? If it fried the traces in the ECU, wouldn't that be too much current for one ground wire anyway?
So confused and he's frustrated. Nothing on the harness was changed, just a larger displacement engine since last time..
All the best,
Eric
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