4WD Stuck on?
#1
Junior Member
Thread Starter
4WD Stuck on?
Hey Folks, new to the forum and damn glad to be a member! Just got the truck back from the shop and I'm told my 4WD is stuck on. 2003 F150 Lariat 5.4/ FX4. The dash light isn't on and the switch is in 2H position. When I flick the switch I can hear it clicking and the dash light comes on. Mechanic tells me the front wheels are engaged though. I'm thinking a vacuum problem? My EATC hasn't been working for a few months, wonder if that has an affect on vacuum. It will barely blow any air no matter how high the dial is set.
The following users liked this post:
olliesxl (01-06-2017)
#2
Senior Member
Get under the truck and move the transfer case linkage manually. Also check the vacuum solenoid on your front diff (a plastic shield will have to be removed). There are 2 vacuum lines - with the 4WD off, there should be vacuum on the pink line. With it on, it should have vacuum on the blue line. If it's a vacuum problem you could reverse the lines to disengage the shift fork as a temp fix.
#3
Senior Member
You can get rid of all that vacuum crap and replace it with a cable lock for about $125. Much more dependable. You'll have a **** that you'll pull out about an inch to engage the front end. Something else that's notorious for fouling up on your truck is the electric shift motor on the transfer case. No quick fix or bypass for these, you have to replace. You need to figure out whether its your front end that's engaging or your transfer case.
#5
Senior Member
You can get rid of all that vacuum crap and replace it with a cable lock for about $125. Much more dependable. You'll have a **** that you'll pull out about an inch to engage the front end. Something else that's notorious for fouling up on your truck is the electric shift motor on the transfer case. No quick fix or bypass for these, you have to replace. You need to figure out whether its your front end that's engaging or your transfer case.
#6
Senior Member
Its a very simple system to install. You remove the vacuum actuator on the front axle and unplug the vacuum solenoid electrical connections on the firewall. Drill a hole through the drivers side lower firewall and route the cable to the front axle. Mount the cable with the supplied hardware and that's all. Comes with detailed instructions. Its much more reliable than the factory system and cheaper than replacing the factory components.
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#9
Senior Member
Hey Folks, new to the forum and damn glad to be a member! Just got the truck back from the shop and I'm told my 4WD is stuck on. 2003 F150 Lariat 5.4/ FX4. The dash light isn't on and the switch is in 2H position. When I flick the switch I can hear it clicking and the dash light comes on. Mechanic tells me the front wheels are engaged though. I'm thinking a vacuum problem? My EATC hasn't been working for a few months, wonder if that has an affect on vacuum. It will barely blow any air no matter how high the dial is set.
The following users liked this post:
olliesxl (01-06-2017)