I have been working on this problem for months with no success. The car has a code 41 (no others in addition to it). I have replaced the ECM, swapped programmed chips with stock chips and verified all ground terminals with a test light. The car barely runs and is so rich you would think you could light the fumes with a match. Is there anything else I can check or that I might be missing with the tests I have already run? I have read everything written on this and cannot come up with any additional ideas. Any help would be very much appreciated. 89 350 TPI (see signature for full listing of mods). THANK YOU!!!!!!!!!!!!!

I thought the signature was attached.

355 - TPI, Edelbrock High Flow intake and runners - ported/polished. 24# injectors, Crane Cam, Air Foil, Cold Air Intake, Moates 4mb Prom adapter w/remote, 160 Degree Therm, Edelbrock Headers, Gale Banks 3" Cat Back, 3.70 - 9 bolt BW Rear, Spohn lower control arms, Poly Carbon bushings all around, K&N Filter, MSD 6AL Ignition, Coil and Wires, 4th Gen R-Spoiler, B&M Mega Shifter, Manual T/C Switch, Crane AFR, TD "Wonderbar", SFC's

Any chance that it could be linked to the grounding issue, even though my test light shows grounds at the designated pins on the ECM connectors? I am testing with the connectors disconnected and ignition on as outlined in the tech manuals.

Did you plug the original MEMCAL into the side of the Moates adapter?

RBob.

No, I took the adapter out and put the original memcal back in. So sorry I did not repsond to this earlier, I needed to update my email address in my profile. Any assistance would be big time appreciated.