does anyone know the pin-out for the ecm connectors? can't seem to find them anywhere

 

Do you think you could be a bit more vague? Including such information as vehicle year and which engine is important to having the faintest idea what ECU your car is equipped with.

That being said, assuming you're referring to the 90 LO3 in your profile, that's a 1228746.

http://www.cruzers.com/~ludis/ -> C3 ECM Crossreference -> 5.0 V8 TBI "E" LO3 -> 1990 -> 1228746 -> Schematic -> (scroll down a bit to find the correct header) Outputs

Or, now that you know the part number for your ECU from the crossreference, searching for the pinouts should be easy.

Or just click here ftp://ftp.diy-efi.org/uploads/1228746.jpg

 

didn't mean to be vauge. i knew what the part number was i just spen three days trying to find the information on the pin-out with no sucsess. thank you.

 

http://www.chevythunder.com/