[qdac]

Some of what I am going to say here is a GUESS. However, I have spent a LOT of time poking at and analyzing the L-Jet system on my 1981. I even bought and read the book!

The public opinion is that the controllers on the L-Jet rarely go bad.

My understanding is that the L-Jet ECU boxes versions .02, .03, & .04 are interchangeable. The .01 version (what you have) is SPECIAL, probably (GUESSING here) because the AFM was changed and presents different test resistance values between early models and the later models. If you change to a newer ECU, then you should consider also changing to a newer AFM. I can point you to the magic date stamp on the AFM if you need to see it to verify the model - it is HARD to find.

I don't know if the Temp II sensor differs between the L-Jet years. Please look it up. These three (ECU, AFM, and Temp II) should probably all be for the same year. VERIFY THE WIRING. It might have changed along with the ECU/AFM change between the .01 and .02 versions.

I found a spare .03 ECU on e-bay cheap and I have swapped between the .02 and .03 versions on my 1981 (with the newer style AFM) without any apparent change in behavior. My AFM is definitely the newer version.

I don't see many .01 or .04 ECUs on e-bay. Maybe those cars don't get parted out as much. You may have problems finding a .01 ECU if yours is bad - but this is unlikely.

I feel it is more likely that your AFM is having troubles. There is a 944 web site that discusses testing and tweaking these items. Google it.

My understanding is that if your Temp II is bad or disconnected, your engine will run so rich that it will not fire. Verify this.

Check spark timing - I had to remove my distributor for other work and I re-installed it one tooth off. It didn't start.

A lot of people on these boards claim that their engine fires for a second and then dies. My GUESS is that they are running off the cold start injector and that their ECU isn't doing its job. Are you seeing this behavior or are you not seeing any fire at all?

Good luck with this - I had the advantage of starting with a running system and so it was easy for me to make a change, look at the effect, and then make a decision on what to do next.