Transmission Wont Shift Properly After Smog
Thread Starter
Seasoned Member
Joined: Jul 2013
Posts: 259
Likes: 15
From: Southern California
Year: 1988
Model: Cherokee
Engine: 4.0L
Transmission Wont Shift Properly After Smog
So I got my Cali Smog done the other day. Good news is the truck passed with flying carpets. The bad news is now my transmission isn't shifting past 2nd gear.
The first night I removed the battery cables, and reset the PCM. I also removed the plug from the TCM and sprayed it with electronic cleaner. After that the transmission worked fine.
After a day or so it began doing the same thing. Tonight I unplugged my battery again, reset the PCM, but didn't do anything with the TCM and the problem still persists. Tomorrow I will try my original ritual and see what happens.
I'm thinking TCM. How do I test it?
Any wisdom would be great!
The first night I removed the battery cables, and reset the PCM. I also removed the plug from the TCM and sprayed it with electronic cleaner. After that the transmission worked fine.
After a day or so it began doing the same thing. Tonight I unplugged my battery again, reset the PCM, but didn't do anything with the TCM and the problem still persists. Tomorrow I will try my original ritual and see what happens.
I'm thinking TCM. How do I test it?
Any wisdom would be great!
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
See Tip 10.
Grab a TCU from a JY. 88 to 90.
Or come over to my house and borrow one of my spares.
I wonder if Nick's REM could help diagnose????
Grab a TCU from a JY. 88 to 90.
Or come over to my house and borrow one of my spares.
I wonder if Nick's REM could help diagnose????