Have a 2002 f150 4x4. For some reason when I put it in 4 hi or 4 low the light on the dash comes on and it pulls like its in 4 but the front wheels will not spin. What could this be? I need help ASAP!

 

it could be the actuater in the front diff

 

That's what I was thinking... Is there any way to be 100% positive that's it? I don't wanna spend 150$ for nothing

 

Check your vacume lines first. There's two selonoids behind your battery. There identical... follow those lines down to your acuator and if you don't see and cracks pull your battery and its tray and check the lines there. Then try shooting the accuator with some pb blaster a couple of times.

 

Alright. I'll try that tomorrow. How do you know if you have a leak? Is it noticeable?

 

Should be very noticable. The two lines are pink and blue. If your not seeing cracks or hearing a wistling sound take some dish soap and water and Spray your lines and look for bubbles. Basically what happened to me way my battery was leaking acid and ate threw the lines and destroyed my selonoids. Went to the junk yard and got the selonoids and check valves for ten bucks. I used hard emisions line from autozone to replace what was cracked.

 

Alright. I'll check them. Thanks

 

I've never had a problem with vacuum lines personally, but i don't see the water/soap thing working on vacuum lines.


Since by definition, vacuum lines have a vacuum inside, not pressure...so if one is compromised, it won't leak air from the inside out, it leaks air from the outside in, so it would be pulling the soapy water into the line.

 

you have a point man and I hav not had any 4x4 problems yet

 

I'm thinking it's the actuator. Bc it seems like it partially locks in