4 LO won't work - Ford Powerstroke Diesel Forum
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post #1 of 39 Old 09-12-2010, 11:55 AM Thread Starter
If it aint a CAT itsa DOG

 
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4 LO won't work

The 4 lo won't engage on my truck. 4 hi works fine, but when you put it into 4 lo you can hear a clunk in and then out and the 4x4 light goes out and you can't put it into 4 hi even until you shut the truck off. Dealer told me it was the t case motor when i bought it. Well i replaced that today with no luck. Looks like i am gonna make them reimburse me for that one. What the heck else is causing this? ESOF switch? I have a p1867 code that comes up on my AE. Also where are relays number 40-41? Are those right next to the under hood fuse panel? Manual won't show the location of them. It just says what they are.

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post #2 of 39 Old 09-12-2010, 04:16 PM Thread Starter
If it aint a CAT itsa DOG

 
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bump this up

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post #3 of 39 Old 09-14-2010, 11:12 AM
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I'm curious to see what cames of this.. My truck takes a long time for 4Lo to engage but eventually goes in every time. Good luck

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post #4 of 39 Old 09-14-2010, 11:22 AM
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K - This may be a silly question, but here goes. You are stopped, putting the truck in Neutral, stepping on the brake and then flipping the ESOF switch right? I'm sure you're smarter than me, but the reason I ask is that I learned that the hard way. I would be rollin' along and switch to 4-Hi, which would work. I would do that for 4-Lo - No Go. AFTER I read the owner's manual, did I find out the right procedure.

Beyond that, aren't there vacuum line that run to the front hubs? Could they be leaking, not allowing the hubs to lock? Throwing it out.....


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post #5 of 39 Old 09-14-2010, 02:47 PM Thread Starter
If it aint a CAT itsa DOG

 
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Thanks for double checking on the proper procedure. I know it can easily be over looked. Ok well here is what i have found out so far. Took it back to the dealer and they said its a broken wire somewhere in the whole fricken harness! So now i have to tear through the entire thing to find the broken wire.

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post #6 of 39 Old 09-14-2010, 08:00 PM
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Well that blows. Good luck in finding that.


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post #7 of 39 Old 09-25-2010, 01:46 PM Thread Starter
If it aint a CAT itsa DOG

 
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Gonna bump this up again. Another dealer said its in the t case. Well i can manually put it into 4 low with a crescent wrench. It goes in and out just fine. I bought yet another shift motor and tried cycling it to 4 low with the motor off the t case and it does the same thing, won't hit 4 low and all 4x4 lights go off on the dash. I am still convinced that it is in the wiring somewhere. Don't know if its in the relays or GEM. Anyone else have some more input? 2nd dealer also pulled codes p1820 and p1828 along with the p1867 code that i got. This is driving me crazy guys!

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post #8 of 39 Old 09-25-2010, 07:20 PM
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bump for ya dan

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post #9 of 39 Old 09-25-2010, 07:22 PM
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did you replace the switch?

i need a new one. sometimes it wont turn on unless i wiggle the knob.

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post #10 of 39 Old 09-25-2010, 07:23 PM Thread Starter
If it aint a CAT itsa DOG

 
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Thanks man, not too much help on here anymore. Anyways, i think i am gonna look at the relays tomorrow and still consider the neutral safety switch. I am going to bring it back to anderson's on Monday if they have time to look at it.

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