"P-Time" Light on. 90-4.0, AW4. Disco "command track"
Thread Starter
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
"P-Time" Light on. 90-4.0, AW4. Disco "command track"
"P-Time" Light on. 90-4.0, AW4. Disco "command track"
It did freeze that night, but the part time light is staying on. It still engages/disengages, just the light stays on.
The three vacuum lines on the Vac Disco are still zip-tied in place. (there on the right-front axle). I have good manifold vacuum and the heater controls work. I'm sure it's disengaging, and "bucks", cut hard when engaged.
I guess there is a vacuum switch that gets vacuum after the fork in the disco has moved the sleeve over engaging the right front axle. Sweet! (unless your fork broke, then the light comes on, and you are still in "one wheel" drive)
Does anyone know anything about this switch?
It did freeze that night, but the part time light is staying on. It still engages/disengages, just the light stays on.
The three vacuum lines on the Vac Disco are still zip-tied in place. (there on the right-front axle). I have good manifold vacuum and the heater controls work. I'm sure it's disengaging, and "bucks", cut hard when engaged.
I guess there is a vacuum switch that gets vacuum after the fork in the disco has moved the sleeve over engaging the right front axle. Sweet! (unless your fork broke, then the light comes on, and you are still in "one wheel" drive)
Does anyone know anything about this switch?
Last edited by DFlintstone; Dec 30, 2012 at 08:05 PM.
CF Veteran
Joined: Feb 2011
Posts: 3,074
Likes: 0
From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
Did some reading check my next post this one does not exist 
Last edited by The Rooster; Dec 31, 2012 at 07:53 PM.
CF Veteran
Joined: Feb 2011
Posts: 3,074
Likes: 0
From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
OK i went into my Dad's dealer notes...
If it is 100% out of 4wd the switch on the transfer case on is dirty and they can be cleaned or needs to be replaced...
The other reason he has listed here is that the linkage on the transfer case needs to be adjusted... with time they can get sloppy.. and he has a page Number on how to do that...
If you have no vac problems I would clean the switch on the transfer case to start
If it is 100% out of 4wd the switch on the transfer case on is dirty and they can be cleaned or needs to be replaced...
The other reason he has listed here is that the linkage on the transfer case needs to be adjusted... with time they can get sloppy.. and he has a page Number on how to do that...
If you have no vac problems I would clean the switch on the transfer case to start
Thread Starter
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Thanks guys! Yea, I suspected as much. It's been freezing cold and I have junk in the only "bay" to bring her in and really get up in there.
"the switch on the transfer case on is dirty and they can be cleaned",....sounds like what I was fishing for. As you know I'd clean a switch before replacing. Happy New year to you both! Don
"the switch on the transfer case on is dirty and they can be cleaned",....sounds like what I was fishing for. As you know I'd clean a switch before replacing. Happy New year to you both! Don
Thread Starter
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Rooster, my left engine mount, ( & tranny mount) is, and has been toast for a long time, so my linkage IS wrong. (doesn't touch/"radio")(I pry my engine back an inch anytime I want to remove the E-fan). Me thinks this is a "disco" related thing with vacuum, and your dad's note that the switch can be cleaned is SUPPER! 
Last edited by DFlintstone; Jan 2, 2013 at 04:29 PM.
Trending Topics
Thread Starter
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Well my "mistake", except we clarified a couple things in this thread. It turns out that the left, (That's the driver side), of the three lines on my "disco", had been dis-lodged by a limb. The lines looked in place, (thanks to the zip-tie), and it still provided 4WD and functioned. The other two provided "function", except not providing vacuum to the switch to turn the light off while in 2WD. The left one is the longer finger on that pair. Its "long finger" , (back behind), had been knocked loose, but the plug it's self came back to about in place.
Finding no vacuum at the switch is what put me on to looking better at the disco connections. Thanks again Cruiser! (go ahead, STEAL the photo...you know you want to...)
Finding no vacuum at the switch is what put me on to looking better at the disco connections. Thanks again Cruiser! (go ahead, STEAL the photo...you know you want to...)
Last edited by DFlintstone; Jan 3, 2013 at 06:12 PM.
Thread Starter
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
If this thing makes it another 30K to 300 maybe I'll give IT a bath, and YOU better photos! 
(Thanks again for another invaluable tip) (I DID spend some time in the FSM. Guess I'm not very good at that, didn't find that switch)
(Thanks again for another invaluable tip) (I DID spend some time in the FSM. Guess I'm not very good at that, didn't find that switch)
Last edited by DFlintstone; Jan 3, 2013 at 08:55 PM.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0