Does anyone know anything about the ‘299 ecm used in the ’92 full size trucks? Does and ecu/xdf exist for them? Good, bad neither? I think the ECM is dieing in my truck: almost random codes and bad running that I can’t pinpoint to anything actually being wrong with the truck and nothing funky when scanning it while running. Friday it suddenly started surging and trying to stall, vacuum dropping low enough that I was loosing power brakes, hooked up a scan tool and it went away, removed it and it came back, all the problems just went away on their own last night even after 3 LONG test drives. Today on the way to work the check engine light came on but it was running fine, but when I plugged the scan tool in it showed nothing out of the ordinarily but started pinging badly, like a box of marbles trying to cruise just slightly uphill and would still ping some at idle, killed the power to the scan tool and it went back to running fine. Scanned it again on the way home and still didn’t see anything wrong but it did have TPS, EGR and O2 rich codes stored. I few weeks ago I was talking to turbocity about one of their crossfire TBI swaps (customer’s car, they use a 7747 for all their TBI stuff as far as I can tell) and brought it up and they suggested that I shouldn’t even mess with it and swap to a 7747. If I end up having to replace the ECM I’d rather just get whatever I’m best off using in the truck rather then doing the swap 2x, from what I can tell, the 7747 and the 8747 is just a plug in into the existing harness, but the 7747 has the best aftermarket/DIY support. Thoughts/comments/ideas? Something else I should consider?

6299?
Manual tranny?

Tunercat has an editor for them.

Just hang on and get one of the Ultimate TBI ecms that's about ready for release. There's a thread already running about it.

Ok, I may be a bit lost here (wouldn’t be a first time, huh?) but I was under the impression that the ultimate + lockers deal was an add on for ecm’s like the 7747, so I’d have to upgrade to a 1228746, 1227747, 1228063, 1228747, 1228062 and then add that in, or am I totally lost?

Has any price been announced for the setup yet?

Secondly, doing a search for the 299 (16146299) I keep reading about advantages with the 299 but no listings of what those advantages actually are, if anything, or for that matter, what the difference is between it and the other TBI ecm’s

I don't see the difference from one TBI to another. I'm working on piggy backing one to the PCM in my 91 7060 PCM.

Nothing final that I've seen.

About the only thing different other then the tranny (for the autos), is the faster ALDL, and the UTBI has all that plus some.
The later PCMs all suffer (we'll all that I know of) from the same problems of the earlier TBI, code wise. Adding some of the UTBI changes, to my 91 made a signifigant difference.

So that brings me back to my original question… it looks like the 299 is pin compatable with the much more common and better documented 7747. If I need to get something for it sooner rather then later does it make sense to just swap to the 7747 rather then replacing the 229, or will I loose something or cause myself a hassle with that? Is there a better choice?

I’ve been looking at the “update” thread about the '8625, and although I can see the advantages there, I also don’t want to particularly get into repining my daily driver for a largely unknown setup.

FWIW, it’s not a manual tranny, it’s a 700r4…