I just tried to follow some of the ideas on this subjuct. I cleaned and re-greased all connections refered to and then traced my vacuum line from the brake mastercylinder. I found the formed vacuum line going under the valve cover to have a hole worn in it. The line runs through the fire wall with the a/c lines. It won't hold a vacuum. Where does it go and what is it for, please. Thanx for your help in advance.

 

It probably runs the blender door for your heater and A/C.

 

Yep, what he said. My 96 had the line somehow fall on the manifold and melt. Maybe I knocked it down there, I don't know. But when it wouldn't hold vacuum the heater/AC selector **** no longer worked.

Chris

 

Where can I find a good manual for my truck? '96 extra cab,LB,CTD,AT. Something that would show how to trace that vacuum line. Thanx again.

 

There isn't much to it. It goes through the firewall and up to the back of the heater control on the dash. The heater control could be bad, or one of the vacuum actuators that control the doors in the HVAC system could be bad. I had one go my on my 96.
Haynes manuals talk about it a bit.

Chris

 

Ok, so where is the speed sensore on a '96? Not on the rear axle correct?

 

There is one on the axle and one on the tranny. On my 99, supposedly, the PCM uses the tranny sensor to determine if it should pay attention to the signal from the axle sensor, and actually obtains the speed from the axle sensor.
I do not know enough about the programing of the PCM for 96 to say if it is the same way on that year.

Chris

 

did that - no help

 

My wifes '02 had the ABS light come on a few months back. I told her it was ok to drive until I figure it out.

That turned out to be a bad idea. The ABS sensor on the front wheel was damaged by the wheel bearings when they started going bad. The next day the wheel almost came off.

Don't wait too long to find out the hard way.

I'm not saying that's your problem, just that when the ABS light comes on, it is not always safe to keep driving.

...............Jim

 

I am at my wits end, I cannot fix this , probably going to have to go to ***********, but may wait for the 50 start idea

 

What have you done to the rear speed sensor?
Mine still comes and goes, on the 96. No rhyme or reason...
It was on today for a little while.

Chris

 

replaced with new one