Lazy downshifting in 4l60e
10-13-2014, 08:38 AM
#1
Lazy downshifting in 4l60e Lately my truck has been acting lazy on 1st gear downshifts. It seems like if I am accelerating moderately it will hold second gear until about the time I am ready to ease out of the throttle...then downshift. Most of the time if I roll in hard enough I want it to drop to first it seems to do the same thing...delay until I have accelerated to the point I no longer really need or want a downshift.
At first I was leaning to be something funny in the tune since I switched to the 2002 PCM operating system during my cam swap, but I am starting to think it may be something in the trans itself. I think the other day after coming to a stop the truck tried to take off in second instead of first.
Do any of you experts know the basics I should check before I start messing with solenoids in the pan? (if solenoids could be the issue?)
I haven't noticed this annoying behavior with 3-2, 4-3, or 4-2 downshifts.
At first I was leaning to be something funny in the tune since I switched to the 2002 PCM operating system during my cam swap, but I am starting to think it may be something in the trans itself. I think the other day after coming to a stop the truck tried to take off in second instead of first.
Do any of you experts know the basics I should check before I start messing with solenoids in the pan? (if solenoids could be the issue?)
I haven't noticed this annoying behavior with 3-2, 4-3, or 4-2 downshifts.
10-15-2014, 12:06 PM
#3
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Have you tried logging data to see if its following the tune parameters? Have you commanded the shifts and see if it can complete them quicker? That's what I would check first.
10-16-2014, 08:21 AM
#4
Good idea. If that doesn't work I might just drop the pan and swap for some extra solenoids I have along with fresh fluid and filter. This fluid has around 25k on it I think. Maybe a little less.
I'll also try a compare between my stock tune and the current 02 OS tune looking specifically at the trans section for things that could be the issue.
I'll also try a compare between my stock tune and the current 02 OS tune looking specifically at the trans section for things that could be the issue.
10-22-2014, 09:43 AM
#5
Lately my truck has been acting lazy on 1st gear downshifts. It seems like if I am accelerating moderately it will hold second gear until about the time I am ready to ease out of the throttle...then downshift. Most of the time if I roll in hard enough I want it to drop to first it seems to do the same thing...delay until I have accelerated to the point I no longer really need or want a downshift.
At first I was leaning to be something funny in the tune since I switched to the 2002 PCM operating system during my cam swap, but I am starting to think it may be something in the trans itself. I think the other day after coming to a stop the truck tried to take off in second instead of first.
Do any of you experts know the basics I should check before I start messing with solenoids in the pan? (if solenoids could be the issue?)
I haven't noticed this annoying behavior with 3-2, 4-3, or 4-2 downshifts.
At first I was leaning to be something funny in the tune since I switched to the 2002 PCM operating system during my cam swap, but I am starting to think it may be something in the trans itself. I think the other day after coming to a stop the truck tried to take off in second instead of first.
Do any of you experts know the basics I should check before I start messing with solenoids in the pan? (if solenoids could be the issue?)
I haven't noticed this annoying behavior with 3-2, 4-3, or 4-2 downshifts.
