Anyone have a 4L80E program?

[Taz]

I thought you had been battling a transmission oil pan leak ... sounds like you are describing the engine oil pan. If its the engine oil pan, these must be aligned with the rear block "face" or machined surface - within a fairly tight tolerance - or they will leak and / or cause stress on the transmission input shaft. Its a challenging task with the drivetrain in the vehicle.

Some people will "eyeball" this, others use feeler gauges - I have done both, put prefer to use the proper alignment tools whenever possible.


Regards,
Taz

[joecar]

Oh, engine oil pan... yes, you need the alignment tool, what Taz said.

[Telco]

Oh no, the trans is golden aside from the shifting problem. I'm thinking that the oil pan is going to be a dealer fix depending on what they want for it. I've spent way too much time on it, and need to get on the tuning as well as the crap I've been putting by the wayside to get that engine in.

[Telco]

Oh no, the trans is golden aside from the shifting problem. I'm thinking that the engine oil pan is going to be a dealer fix depending on what they want for it. I've spent way too much time on it, and need to get on the tuning as well as the crap I've been putting by the wayside to get that engine in.

Speaking of time, as always I'd like to thank everyone for the time they've spent helping me work through these little problems. A lot of my frustration with the vehicle project is related to stress from other parts of my life. If it were just the vehicle, no problem.

[Telco]

Update - The oil leak is fixed (turned out to be a PCV system issue) so I'm about to rip the interior out so I can install the wideband the way I want it. Initially the wire will just run to a point where it will hang under the dash but eventually I'm going to convert the ashtray into a cable access point where I can plug the laptop into the wideband with a short cable. I'll also be able to plug a flashdrive into a new stereo later. But I digress. I'm hoping to be able to start on wideband tuning over the next week.

I managed to get the 2002 program loaded into the truck. You have to do a full flash to get it in, not the quickie flash you normally do when tuning. The first problem I had with it is the battery light keeps going on and off and it sets a P1638 code, generator F terminal circuit. I know at some point they went to a PCM-controllable alternator. Is this something I need to put on the truck now, or is this something I can disable? So far I've not found any manipulatable fields for this. Or, will it hurt anything if I just disable the MILs for this? I'm really hoping I can retain the 2002 program for that lean cruise feature.

Anyway, thanks for the help so far and I really appreciate how nobody seems to mind how I disappear for weeks at a time. It's about to get worse too, as the union side of my company is about to go on strike and I'm gonna be working massive overtime covering for them.

[Taz]

Hello Telco,

Yes, an OS change requires a Full flash (OS & CAL). Regarding the alternator, you have two choices. Either set P1638 to "Not Reported", or connected a wire from C2 pin 52 (which will be empty in your current wiring harness) to the alternator "F" terminal (which will probably be marked as "I" on your current alternator connector).


Regards,
Taz

[Telco]

Sweet thanks. If I were to connect the wire as mentioned, what effect would it have?

[Telco]

Also, found that under G1206 there is a field where you can turn Alt Term F on and off. I decided to turn it off to match the old program.

[Telco]

OK, got the battery light knocked out by shutting it off in the program. My truck's not wired for the F terminal connection, so no harm in not having it. I also figured out why I was unable to get the shifting to adjust correctly. I was thinking that fields D0701-3 were indicating how much was to be removed from the base shift pressure, and that a higher number would mean a softer shift. I'm embarassed, but I'd rather show embarassment and prevent others from having problems than keep quiet and let others stumble. So, I'm finally starting to make progress with this thing.

Unfortunately the union guys in my company are striking starting tonight, and we non-union guys are going to be working massive OT to cover until the strike's over. As I'm down to only the truck to drive, the wideband will be having to wait a bit before I can install it. Sucks, but I'm going to run a partial Corvette tune for the engine which the truck seems to like. Thanks for the help folks.

[Telco]

I'm getting this thing close on the transmission. I do have a question on fields D0701, D0702, and D0703. What would I see if the fields were set too low? I know too high is a slamming hard shift. I have the 3-4 shift perfect, and the 1-2 is almost there, but I can't seem to get the 2-3 to smooth out enough. It's halfway there now though, but it seems like D0702 is getting way lower than D0701 and D0703. Just wanting to make sure that too low of pressure won't cause slamming shifts too.