Well recently i gutted the cat on my car and i test drove it and it broke a coolant line off the waterpump and the coolant sprayed all over, so i fixed that and it ran fine for a bit then after driving for about 10 minutes or so the car started running horribly and black smoke was pooring out and it only would run if i feathered at WOT and if i shut the car off i have to hold it to the floor and let it crank for 10-15 seconds to start then it poors out black smoke and itll keep smoking

i changed the TPS and MAP from another car and it didnt make any difference but i did notice i left the map unplugged and it ran alot better. i tried checking the codes by crossing the jumper (1993) and it shows nothing, the check gauges light stays on and the fan comes on, also the fan stays on when its running. if anyone knows anything this could possibly be please spare the knowledge, im thinking its the optispark or coil/module. but i dont know

 

same thing happend when i swapped my engine .. your ecu shorted .. radiator fluid went on it and it shorted out.. check your heater core for cracks also =) any other questions feel free to ask me. i was stuck for like a week strait tryin to figure that one out.

 

CTS is shorted with antifreeze. ECM would think it was -146° causing it to run very rich.

 

Isnt the ECU inside the car? my leak is out front by the waterpump and it sprayed straight up. but the CTS sounds like that would be the problem. ill try that and see if thats what the problem is.

 

yea .. but if ur radi lines burst then a heater core line may have burst also because they are pretty weak .. causing it to leak right onto your ECM which is right under ur passenger side dash. Thats how my ECM went.. it would run fine for 10 minutes then just DUMP black smoke. went to autozone picked up an ECM for 80 bucks .. threw it in and it ran perfect.

 

well the problem was the CTS now it runs good thanks for the help guys