colekill

or is it my imagination? either way its annoying.

I assume its to smooth out the transition

shupe

iTrader: (7)

Wouldn't doubt it. Believe it did with the gmt900 series. It's been too long and too many mods to run logs to verify.

00pooterSS

iTrader: (40)

Doubtful. Be absolutely retarded if so because it would offset/negate the fuel savings of 4cyl mode.

If it did, you'd notice the RPM jump up and down a few hundred rpm or so when it engaged/disengaged. I haven't noticed it doing that.

If I get a few minutes today I'll datastream my truck and monitor the lock up. But my money is on no, that it does not.

colekill

I think it unlocks during the switch then locks back up after 5 seconds or so. i do get a rpm bump when it happens.

I'm pretty sure this is whats happening now, but now i wonder if its supposed to, does everyone else's truck do the same..?

trxmxzx

iTrader: (7)

00pooterSS

iTrader: (40)

I read your post wrong. During switching, maybe, I can't say 100%. There are a couple of switch on/offs of the tcc that I wasn't sure what caused them, because I was watching for typical TCC operation, the cyl deactivation could very well have been it.

I will tell you that if you're familiar at all with how TCC used to work (up till mid 00's) things have drastically changed. I saw the same basic activity I just saw with my truck with a late 00's Cadillac CTS. They run the converter at just about all times.

I shot this video on the fly and since I read your post wrong I wasn't eagle eyed on the cyl deactivation/moment of activation deactivation and TCC.

I gave you a shoutout in the description

edit: watching the vid a little closer looks like it does switch on and off during the cyl activation.. I have been in a big hurry during filming this and since filming so I haven't had time to analyze it.

00pooterSS

iTrader: (40)

at around 2:10 in the vid it switched to 4 cyl mode and there was a dip in the graph so it appears it did turn the tcc of during the 8 to 4 switch