Thought one of you guys might be able to help but if this is inappropriate I am sorry. Installed GM TBI on an older four cylinder engine and discovered the distributor rotates opposite direction as the GM 2.5 engine. Needless to say I have allot of retard and no advance. I have been running engine with bypass unhooked. Any hints would help because 0 is the least that T Pro will allow in the main spark table. Using the 165 ECM with $94 mask 91 S-10

 

What did you use for distributor? Or did you do a duraspark pickup to external mounted EST? Wires are backwards...

 

I machined the 1991 GM 2.5 distributor to fit in the older engine. This is an eight pin distributor.

 

Swap the two wires from the pickup coil to the ICM. IOW, reverse the terminals they are on going to the ICM.

RBob.

 

That change corrected the advance problem. THANK YOU
I did need to adjust the base timing a substantial amount after changing the wires. Is that normal?

 

Yes, that is OK.

RBob.