89 SC issues

PjsBird

Registered User
Hi there. I'm having some issues with my cars ECU

Its an 89 Auto, but i had a wiring issue that blew my ecu. so i replaced it with a comp from an 89 5spd. It runs, and there are no check enigne lights, but it seems to idle strangely, and i can smell fuel. it is running quite rich.

So i tried an ECU from a 90 Auto, and i got a check engine light.

And i tried one from a 91 5 spd. and i got a check engine light.

i put the one from the 5spd 89 back in, no check engine light, but it still runs funny.

My original computer number was A9Z2

the 89 5 spd computer number was A9V2

What are the differences? My car actually has a 5spd engine in it.

Will running the 5spd ecu make a difference from the 89 auto ecu?

or is it running rich because of the comp relearning how to idle after being disconnected?

The car is low on gas as well, could that be making it run rich?

I cant drive the car right now, as I dont have a liscence for 3 more weeks, so i dont know how it reacts on the road. but any info in this subject would really help me out.I need it road worthy when i get my liscence back...

-Preston
 
ecu

would any comp from an 89 auto with EGR work? or do i need to match up numbers????

please guys. i wanna try and get this car done asap...
 
Try doing a search for ecu + compatibility.
89 and 90 had same ecu
5-speed and auto can not be interchanged.
91-93 had their own ecu
94+5 had their own as well.
i think thats what an elder said [xr7dave i think)
any vets be more specific?

paul
 
search

Well. tried the search, got nothing.

and also, tried the ECU from a 90 auto, and it didnt work.

So something is not right.

-Preston
 
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