I just switched out the transfer case (NP 241 C) and It still wont go into 4wd. The vacum line to the transfer case is capped off and always has been. the only thing left is the transfer case switch or the actuator. Can I remove the acctuator fron the diferential and check to see if its working ok or does it ground to the diferential?
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Do you know which of these your truck has ?
Transfer Case - BW 4401 (Two Speed Manual)
Transfer Case - BW 4470 (Two Speed Manual)
Transfer Case - NVG 241-NP2 (Two Speed Manual)
Transfer Case - NVG 243-NP1 (Two Speed Selectable)
Transfer Case - NVG 246-NP8 (Two Speed Automatic)
There is a vacuume switch with 3 vacuume lines running to it on the top side of the transfer case that is a known problem on push button 4wd. If i remember right the 91 has this and it should take care of your problem. It's called the transfer case switch and it's about $15.
Possible the vacuum bleed-off to the switch you installed isn't allowing it to completely disengage. Pull the bleed-off line from the new switch and see if it works. could be just a tight spot/bent closed in the bleed-off line or the vent plugged.
It sounds like you have a problem with the vacuum lines that travel from the transfer case (these should be color coded lines that are green, red, and black). Goodluck
Any time your dealing with a 4x4 system the best start is at you front axle. Its primarily a vacuum leak so check to see if the 2 vac lines are hooked up (its good to check the electric connections.). When your 4 wheel drive is engaged and the motors running you should have vacuum at one or both of thee lines depending on if your in 4 hi or low . If no vacuum at axle check the Vacum switchs(the plug with 4 vac lines) on top of the transfer case it will have 2 feed lines(grey & green) they conect in to the into the vacum harness on back of motor (passanger side). A vacum schematic is normally located on the raditor core support (right under the hood next to hood release) Hope this helps
there is a vacuum solonoid on the firewall in the middle with 2 vac lines and a 2 wire plug
thats ur problem
push the button and smack it with the handle of a screwdriver should work
there is a small sensor on the top of the transfer case that has three vacume lines into it. that little switch has a bearing that the vacume sucks up to operate the 4 wheel drive. replace as well as check the vacume lines to make sure you dont have a hole or leak in them
its a vacume operated cylinoid on the top of your transfer case. has three vacume lines to it. replace. could also be your vacume lines to that switch. check usally they touch the exhaust manifold and put a hole in it check that as well.
It sounds like you may have vacuum problem. There are several places you need to check. FIrst check the vacuum line from the engine to the tranfer case. Then check the vacuum lines from the transfer case to the front differntial. If all lines check good, there is a vacuum swith on the top of the transfer case that may be the cuase of your problem.
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