4l60e shift trouble
#1
4l60e shift trouble
My son in law'* 95 Suburban started not shifting up without lifting off gas. He said it was like that for about a week and now it will only pull in reverse and first. It is just like you shift to neutral on upshift. I unhooked the battery for reset, no help. No codes on scanner (OBD 1), TPS tests good, A & B shift solenoids check good, 1-2 accumulator looks good. I don't have a pressure gauge, but it pulls strong in reverse and first, no slipping. I have the 2-4 servo out. The Teflon seals look perfect but the red o-ring has an odd looking place on it and the servo piston bore is discolored at the bottom and shiney clean the rest of the way around.Am I looking at my problem here?
#2
Senior Member
I know this is going to sound weird but I would check the ignition switch. I've seen where the switch wears out and won't provide enough amperage to operate the solenoids in the transmission.
#3
Thanks, but don't, seem to be anything there. I have also looked at the plugs and they appear clean. Also looked at the wiring harness for any damage and haven't found anything. Still pulling out my hair.
#4
Senior Member
Just for giggles I would wire up something like a fog light and see if the power feed to the transmission will light it up. There was also a post on here not to long ago about a guy who replaced the transmission and it still had a problem and it turned out that the driver in the PCM was bad so I would check out the integrity of control circuits from the PCM as well.
The following users liked this post:
Soft Ride (01-27-2014)
Thread
Thread Starter
Forum
Replies
Last Post