91 ZR-1 Cutting Out Under Load

[tomtom72]

Greg,

With out being forward I will say this. If you think about what's happening it is unlikely it is the EPROM or / and the ECM. In retrospect I fell for the same thing, ECM, so now I have a spare! Reason I say unlikely is that the few things the ECM controls but has no direct feed back control loop from are the injectors, hence no codes. The only feed back to the ECM from the injectors are the O2 sensors but they can only code if they fail. If the motor is rich or lean the only way the ECM knows is if it can read the O2 data. If the O2 data shows up on a scan and presents in a manner consistant with the expected then one must think that the O2's and the ECM are good. Therefore, the only other parts that can be questionable in the fuel system having to do directly with combustion are the injectors. Assuming the rest of the ignition system is up to snuff and the fuel pumps & regulator & F/F are okay. At least that is my simplistic understanding of the EEC system as it relates to this case.

Oh and as far as the cleaning & flow testing, I learned from the netregistry site that any efforts in that direction are mostly meet with less than satisfactory results, not worth doing seems to be the general concensus on that subject. That and the fact that before 92 the coils are not alky proof.

I have a spare ECM, and I can remove the 90 EPROM and lend it to you if you feel you want to try that as a diagnostic aid. Like I said, I fell for that 'easy out' because a mechanic said "oh those ECMs su#k, they always fail!" Soooo, now I have a spare! I believe it is for a 91 as the 90 ECMs are NLA.


Tom