Something stupid??? I HOPE!!!

[WVZR-1]

It's good to see that you were able to recover the ECM - now just start over with the correct ECM/PROM combination and let's see if "life can get good"!!!

You've accomplished a good bit with just the "recovery" - more than you can likely imagine!

[Pete]

Originally Posted by WVZR-1

Adding to your items to check is maybe first of making sure the PROM is correctly seated in the ECM. That I might think of the most important starting point given all of the previous information. It might be wise maybe to post the information from the PROM - maybe it has someone's "autograph" on it. Maybe! Is it important? Likely not but it would be wise to note it.

Cranks but won't run is covered in 6E I believe and has it's own chart. I don't have a correct FSM but I'd guess maybe it would be A-3

You check first the things that you've done your self. The first thing you did when you replaced the ECM should have been to install the PROM - I'd start there. Just makes good sense!

Bingo,make sure the ECM and prom are seated right.

If you have fuel (45-50 psi) check fuses then check for spark.

Also you might wanna check crank sensor (under car right side of motor next to the dipstick.


Pete

[A26B]

Originally Posted by Pete

........
Also you might wanna check crank sensor (under car right side of motor next to the dipstick.
Pete

Agree...
I am receiving orders for the CPS (crank position sensor) more frequently. Owners are finding small cracks in the sensor and intermittent "opens" (no resistance when checking ohms) CPS electrical connector should be cleaned & made sure it's tight.

[mike100]

I'm 15 miles down the road. I have a tech1 scanner and a spare known good ecm and prom for a '91. PM me when you get in town.

Mike

[yzpilot]

Ok guys...I have to say, the best thing I have done since I bought this car is to join this forum!! Really, thanks for everyone's help and input. With that said...Mike, you probably just became my best friend! PM is going out now!

[yzpilot]

Jerry, I'll be sure to check that cps as well...also, thanks for the quick and great service on all the other parts!!

[mike100]

Somebody's car is running again (on the loaner ecm)...

It complained and clattered for a few minutes and was only running on 7 cylinders, but the valvetrain pumped itself back up after the oil got hot. I guess it had sat for 3 years+

Needs a 91 ECM. Full comms with the tech1A, but my guess is the Injector Driver is stuffed- intermittent fueling, won't start easily/ at all. IGN present, tach signal present and displayed on scanner etc.

[yzpilot]

Can't ever thank Mike enough!!!! SO to my relief, as Mike mentioned, she is alive! Felt so good to take it for a drive! So as Mike mentioned, the ECM was definitely the problem. Soooooo....anyone out there have a ECM for a 91 laying around they want to unload? Or anybody have recommendations as to the best person to send this off to for a rebuild?? Thanks for all the help guys! And again, Mike, can't thank you enough! Sleep will be good tonight! And good call on the beer! Might have found my new favorite brand! Lol!

[Blownrunner]

Correct me if this is false, but I believe I read that the later years cars' ECM's can be used in the earlier cars but not vice-versa.

So you should be able to use an ECM from a 91-95 car, right?

[mike100]

Originally Posted by Blownrunner

Correct me if this is false, but I believe I read that the later years cars' ECM's can be used in the earlier cars but not vice-versa.

So you should be able to use an ECM from a 91-95 car, right?

I have heard that is true, but never personally tried it.