I picked up an ALDL cable and downloaded the ALDLdroid app to start logging.

My car is titled a 1989 but the line set sheet is dated 11-88. So I tried the 746 mask but didn't get much data. Swapped to the 165 mask and got lots more info. My coolant temp seems to be incorrect though. Cold start was 188 and went down as engine warmed up.

Is there any major advantage to one ECM or the other? I have a 1992 LO3/Auto ECM in a parts car if the later ECM is any better.

 

Tbi used $61 mask in 89/92

 

Where is the best $61 .adx available at? Looks like the app uses a 58 .adx

 

http://www.gearhead-efi.com/Fuel-Inj...Information-61
or
http://www.tunerpro.net/downloadBinDefs.htm#GM

convert the ads to adx

 

November '88 would be an '89 model year vehicle.

 

A083 is the correct data stream for the '89 - '92 TBI f-cars (VIN E).

RBob.

 

I'm pretty certain it's the earlier ECM. Hooked up with Tunerpro and used the $4D mask (88 LO3 only) and got good knock values where the $61 mask kept giving me an ERROR in the knock field.

 

OK, ECM could have been swapped. Drop it down and get the BCC off the chip and the Service Number off the ECM. Then we will know what you are dealing with. Otherwise we can't see the ECM from here...

For an '88 f-car, use A41.

RBob.