I have run the gamut in terms of changing sensors in my attempts to get my 1988 305 TBI 5 speed car to run reliably. I had a local company running datalogging on the car but they were unable to resolve my hard to start and dying at traffic light afflictions. He recommended changing the oxygen sensor and said that the ECM may be bad. One of the last changes I made was to replace the Bosch heated oxygen sensor with an ACDelco unit. This improved my startup but the engine would still die at traffic lights. The last change I made was to install a reman ECM board. Once this was installed, the car ran horribly, and put the car in what I assume was 'limp home' mode. I ordered a second ECM board, assuming that the first one was defective. The car ran exactly the same way with the second one. Then I read a NAPA reference to 'difficulties with drivability after installing a new ECM' tech bulletins. There are supposedly instructions on how to have the ECM 'relearn' the characteristics of the engine in order to re-establish drivability. Is anyone familiar with this process? I love my car but I am tired of walking by it every day and not being able to drive it and enjoy it. Please help!

 

Did you move the EPROM from the OEM ECM over to the new ECM? If not, it is in limp mode.

Did you check for the SES/CEL blink at key-on, engine-off?

RBob.