As the title says, I put a rebuilt ECM in my 89 RS. I went to start it and it tried to turn over, there was no fuel. The connector to the fuel pump relay was very crusty/corroded, so we bypassed this to simply see if the car would run (it has been sitting for 4 months). It ran but was dumping wayyy too much fuel and would die if I let off the throttle.

My friend and I have thought about this for days and are wondering if my ECM is causing the injectors to dump too much fuel or is it the injectors themselves? We are getting a bit irritated (this was my daily driver until this fiasco) and are 1 problem away from going for a carb swap. Any help will be greatly appreciated.

 

CE light on when running? I assume not or you would go there.

When you turn key on, but not start, CE light should blink once than stay on solid. Should go off when car starts.

 

CE light isn't on when it's running. All the lights go off as usual after it starts. I can only drive it up and down the driveway safely.

 

Check the ecm temp sending unit.
If the engine thinks it's cold it will run rich.

 

I replaced the coolant temperature sensor (next to the thermostat housing) and that fixed the problem for about 10 minutes. I drove it up and down my street, turned it off, went inside for a minute, came back out, started it up and it ran like crap again. However, this time I do have a CE light. I'm assuming an OBD 1 scanner would help me at this point?

 

Auto parts store should scan for you. Or scan yourself with jump aldl connection and count blink light(need shop manual codes) or build aldl cable and run winALDL datalog program.

 

A couple of questions:

Why did the car sit for four months if its your DD and why did you replace your ecm?

 

In January the car would go through random phases where it would and wouldn't start (turn the key without pushing down the clutch: that's what it was acting like). Thinking it was the ignition switch, my friend and I replaced it that weekend and it didn't fix it. While troubleshooting it randomly stopped giving fuel. Long story short I got someone to look at it, replaced the ECM (which solved the ignition problem) and now here I am. I've been driving my grandad's truck since then.

 

I would see what codes the car has in it in that case.