I changed my lift pump yesterday and now my ABS light and parking BRAKE light will not turn off, my truck also will not go into four wheel drive like it is supposed to. I got stuck in a mud hole last night and had to shift it in and out of 4X4 at least ten times to get it to engage so I could get out of the hole. Had me scared for a minute thinking I was going to have to walk back to the house. I have never had any problems with it before until now. Could I have broken something while laying across the motor to install the lift pump? Thanks in advance.

 

Double check under the hood for loose electrical connections and a loose vacuum line.

 

I looked and couldnt find anything. The AC is acting up also, no matter what selection you put it on, it only blows up by the windshield where the defrost comes out. What is the deal, all of the sudden my truck is falling apart for no reason. AHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

it sure sounds like you lost a vacuum line some where,,,,the venting on the a/c works with vacuum too,,,,,,,, on my truck there is a line from the vacuum pump to a line on the fire wall then it goes to in side the cab, allso it tees and goes to the c/controll servo, hope this helps , good luck
jman

 

Yup it's a vacuume line. The 4wd is also vacuume controlled

 

What about the ABS light and the BRAKE light staying on in the cab? Any thoughts on that one since I cant find anything that is unplugged?

 

master brake cylinder is also vacuum operated you have probly unhooked one of the lines

behind were you put brake oil there is a big round thing there are 3 vacuum line that hook up to that at least on my truck thats how it is but it is still something to ckeck

brake pedal must be acting funny too you must here somethin leaking wen you press it hard or pedal harder than usual

 

definately vac......at work we call that a "RE-CHECK!!!"

 

Yeah it was a single vac line under the hood seal closest the cab. Thanks for everything, hooking that up made everything return to norma. The truck is pulling to the right kind of hard now but that might have something to do with all the mud caked under there. I need to wash all that stuff out here soon. Thanks again!