Leaderboard

A reman label really muddies the water, so the broadcast code is the one piece that settles it. A logger that connects with the wrong stream can look believable right up until it sends you chasing nonsense.

Yep, that tracks. The 7727/7730 confusion trips up a lot of people because the guts and calibration family overlap, but the packaging and mounting are what matter in the W-body. For CuttyBawl’s case I’d still verify the MEM-CAL broadcast code before trusting any ADX/XDF combo, especially with a reman ECM sticker involved. For scanning only, the right data stream/mask matters more than the XDF, so if it’s truly a 1990 LH0 he should be looking at $88 stuff first, not just grabbing A109 because it “sort of connects.” For tuning, yeah, starting from $A1 makes sense if you know what you’re changing, but I wouldn’t send a first-timer down that rabbit hole until the idle fault is sorted mechanically. OBD1 will happily let you chase ghosts all weekend, ask me how I know.

1227727 and 1227730 use the same chips. One is waterproof and used in W bodies and Corvettes. 1990 is the only year to use $88 code mask. 88-89 are $6D. 91-92 is $A1. 93 is $DF. Thats for the 3.1 V6. The most common with all the data code layed out is $A1. I would use A1 to start and modify from there (because I have been tuning these for over 20 years and can do this).