6.2 sluggish

[outdoorsmen]

Has anybody else experienced under light acceleration that the motor seems to fall on its face as it shifts from 1-2 and 3-4? Mine does, any reason why? It only has 1100 miles and no mods yet. I want a Cai and exhaust but want to figure this out first.

 

[debate]

Has anybody else experienced under light acceleration that the motor seems to fall on its face as it shifts from 1-2 and 3-4? Mine does, any reason why? It only has 1100 miles and no mods yet. I want a Cai and exhaust but want to figure this out first.

Mine used to on the 1-2 when it was cold. Got 11,700 miles now and haven't noticed it anymore. Did you try the T/H button on the left side of the shifter?

 

[outdoorsmen]

Nope haven't pushed that button yet, I haven't towed anything.

 

[BlueSVT]

The powerband for this truck is very high in the RPM range... when it shifts, the truck is no longer in the peak power range, so you will feel a drop in acceleration "rush" until it gets back into the happy zone...

The tuners seem to help this to some degree, as the firm shifts give you more of a "bump" between gears due to the engine momentum at a higher RPM than the next gear... similar to dropping the clutch in a manual transmission, with flywheel momentum... it's a small jump, but it's noticeable.

 

[debate]

Nope haven't pushed that button yet, I haven't towed anything.

Me, either. T/H holds gears better and turns on the compression braking.

 

[Spider-One]

From what I understand the stock programming only allows the throttle body to open so far until a certain RPM is reached. So often after a shift it will close off the throttle body slightly until higher RPM is reached again and it is opened to 100%. Pretty sure I read that from a 5 Star post at one point.

 

[JP7]

Mine is sluggish too with 800 miles on it. The transmission hasn't learned my pedal behaviour yet but it will, then shifting will be better. Yes, the tranny has a brain for that.
I use T/H always - although going down really steep hills I switch back sometimes just to not let the tranny drop gears trying to slow the truck down.

 

[whtrapta]

Has anyone dyno'd this truck to see the power curve? The torque in my 5.4 comes in very early and stays strong until redline. Helps a lot getting this truck off the line in a hurry

 

[NickPic83]

tune def wakes this truck up. i did exhaust, CAI, and tune almost immediately after getting the truck and i have no complaints. for a heavy truck it gets up and goes

 

[DTF-DEUCHER]

this is a simple fix...
stop trying for mpg's and let her have it... just saying

Mines never gave me a power problem