just finished converting a ls motor in a ef hatch to obd 1 with a p75 ecu. everything works good, no cel's. however when we turn on the left or right turn signal the rpm bounces up to 4000. checked all the grounds, found them all connected correctly. the car was a dx originally but we think the motor harness and cabin harness had both been changed because the extra 2 injector wires were in the original cabin harness.

 

sorry just to clarify its not actually the motor reving up just the tach.

 

check your engine grounds