4.6 w f 150 4 wheel drive 1997 keeps fouling out put plugs 3 & 7 I'm not losing water and I use Blue Devil to fix the leak I had it's just those two plugs and there across from each other

SOURCE: 2005 ford f-150...4 wheel drive will not

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system

SOURCE: 1997 Volkswagen Jetta wont start. No spark at

we had the same problem with our 97 jetta we replaced the coil and it was fine.

SOURCE: my 1998 navigator 4 wheel drive got stuck& now ac wont work

2 different electrical circut's that are unrelated. Ac on a 12 year old truck is bound to need some service. Take it to a trusted shop that is not hurting for work & ask them if anything is disconnected, ie: compressor power wire, high pressure switch...ect. Tell tale sign system is low on freon is the compressor keeps cycling on & off with a clicking sound or compressor does not come on at all.

Testimonial: "Thanks that relieves my mind that they might have disconnected something accidently. "

SOURCE: 1997 chevy tahoe 4 wheel drive transmission

my trucks transmission shifts hard and slips only sometimes

SOURCE: Need to know what the fuse box diagrams are in a

they are in the owners manual