Does not switch air positions vacuum line broken on firewall don't know where it goes
SOURCE: problems with vacuum on my 96 Dodge dakota V6
Hi Tnmcat,
Check the available vacuum at a manifold port with the engine idling. It should be 17-21 inches of vacuum. If it is to low,it will give you multiple vacuum concerns. Also, I don't think this unit had a vacuum advance. This timing and advance should be controlled by the on board computer (or PCM). If you turn the distributor it will not change the timing but it will throw the fuel system out of synchronization. Here is the vacuum diagram I have. If you need anything else,drop me a line. Thanks,Chuck
SOURCE: 2002 dodge Dakota stuck I'n 4 wheel drive so u
The 4x4 is controlled by vacuum. There is a vacuum switch on the top of your transfer case that control the vacuum to the front axle shift motor. The shift motor has 2 ports, when vacuum is applied to one side the shift motor moves the fork one way and when vacuum is applied to the other side, the fork moves the other way.
The first thing I would do is verify the hoses at the transmission cross member are hooked up. Then I would remove the 4 bolts from the shift motor and remove the motor and start the engine and shift in and out of 4x4 waiting 10 seconds before each shift and see if the fork moves.
If it doesn't you will need to check the vacuum connector on top of the transfer case and make sure it is fully attached, if it is, you will need to remove the vacuum connector and check to see if you have engine vacuum on one port(around 15" vacuum). The ports are as follows - one port goes to engine vacuum, one port goes to a vent and the other two go to your shift motor. The hoses that go to the shift motor are bad for getting plugged, so you should use compressed air and see if they are clear.
If everything checks out, you will have to remove the switch on the transfer case and operate it by hand while the engine is running and see if the plunger moves in and out. Sometimes the plungers will stick in!
A vacuum gauge and pump are needed to check the motor and switch. If you don't have one, you might need to borrow one and put a vacuum on the shift motor and see if it holds vacuum. Once you put a vacuum on the shift motor the fork should move and then should pump down and hold a vacuum, if it doesn't hold vacuum, you will need a shift motor.
This is alot of info, but there are many possibilities for this not working and you will have to check all these things to diagnose this.
SOURCE: i have a 2000 dodge
IF YOU CAN`T FIND WHERE IT GOES ITS NOT THAT INPORTANT PLUG IT OFF AND RUN IT DONE IT ALL MY LIFE!?
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