AHC Sensor Adjustment for Lift

Joined
Sep 17, 2016
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142
Location
Lenexa, KS
Ok, a few more questions :frown:. After I did the AHC lift, the front sensors are FL -.3 and FR 0 with both joints moved to the top and shortened. Would that have anything to do with why the truck sits 1/2" lower from one side to the other? Should I adjust them to be equal?
 
Joined
Mar 5, 2018
Messages
207
Location
SanDiego, CA
Ok, a few more questions :frown:. After I did the AHC lift, the front sensors are FL -.3 and FR 0 with both joints moved to the top and shortened. Would that have anything to do with why the truck sits 1/2" lower from one side to the other? Should I adjust them to be equal?
You need to crank the torsion bars to get your side to side height dialed in. I only did about a 1" sensor lift up front and I think I did about 6 turns on the passenger and 15 turns on the drivers. It is now sitting level at all 4 corners and all AHC pressures in spec. Your amount of turns will also vary based on amount of miles on your vehicle and how worn your TB's are. Hope this helps.
 
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Joined
Sep 17, 2016
Messages
142
Location
Lenexa, KS
Thanks, I'm going on a big trip so I want to get this right. Both TBs are maxed out right now so one will have to come back. How does the sensor height adjuster value work in relation to torsion bars or does it? If I slam the sensors up and tighten them on both sides but they are not equal values in TS, do they need to be?

You need to crank the torsion bars to get you side to side height dialed in. I only did about a 1" sensor lift up front and I think I did about 6 turns on the passenger and 15 turns on the drivers. It is now sitting level at all 4 corners and all AHC pressures in spec. Your amount of turns will also vary based on amount of miles on your vehicle and how worn your TB's are. Hope this helps.
IMG_0439.jpg
 
Joined
Mar 5, 2018
Messages
207
Location
SanDiego, CA
Thanks, I'm going on a big trip so I want to get this right. Both TBs are maxed out right now so one will have to come back. How does the sensor height adjuster value work in relation to torsion bars or does it? If I slam the sensors up and tighten them on both sides but they are not equal values in TS, do they need to be?



View attachment 1717401
I have only had my LX for about 6 months, so I am new at the whole AHC thing. I learned the little I know off this forum. PADDO is the AHC expert and hopefully he will see this post and chime in.
 
Joined
Feb 1, 2018
Messages
337
Location
Utah
Tried the Sensor lift the front went smoothly and worked. The rear not so much I moved . I am not sure what I did but now it will adjust the height in the front but not the rear. Slide the adjustment to the top now it just sits lower. When I try and adjust it will either just lift the front or blink and stay in neutral. When I try driving it just blinks AHC off. I can take pictures in the morning. But I have no corrosion of any kind so I am at a loss. Maybe it is the sensor but I doubt it. I get the code C1713 from tech stream so maybe. But you think it would have acted up prior.
 

bhicks

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May 1, 2012
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Socal, Forest Falls
Tried the Sensor lift the front went smoothly and worked. The rear not so much I moved . I am not sure what I did but now it will adjust the height in the front but not the rear. Slide the adjustment to the top now it just sits lower. When I try and adjust it will either just lift the front or blink and stay in neutral. When I try driving it just blinks AHC off. I can take pictures in the morning. But I have no corrosion of any kind so I am at a loss. Maybe it is the sensor but I doubt it. I get the code C1713 from tech stream so maybe. But you think it would have acted up prior.
Is your fluid level low? Maybe not enough fluid to get to the desired height? Just trying to toss out an idea that could be an easy fix. Worth at least looking at.
 
Joined
Feb 1, 2018
Messages
337
Location
Utah
Is your fluid level low? Maybe not enough fluid to get to the desired height? Just trying to toss out an idea that could be an easy fix. Worth at least looking at.
I have since ripped out the AHC system so not sure. I could have gone with a new sensor but decided for my needs that I would replace it.
 
Joined
Feb 19, 2012
Messages
720
I installed rear King Springs and now my rear AHC pressure is reading 4.9. Should I adjust the rear sensor down to increase the rear AHC pressure to spec? Is that even possible? Should i just leave it alone and wait for the springs to weaken on their own over time? Thanks for any input/thoughts.
Was there any answer for this? Having the same problem.
 
Joined
Dec 17, 2010
Messages
40
I ended up turning the front torsion bar to get the front pressure in spec and that resulted in the back numbers getting within spec
 
Joined
Feb 5, 2019
Messages
33
Location
Cleveland
I ended up doing the ahc lift today and did not cut the front heim joints. I just shortened them on both sides as far as they could go and moved the top connecting point as high as I could on the slotted bracket.

For the rear I just moved the connecting point as high as I could on the slotted bracket.

From what I read in this thread the high mode should still work. Now if I hit the button from N it will not go to H. Has anyone else experienced this after the ahc lift if they didn't modify the sensors? Thoughts/suggestions?
 
Joined
Feb 25, 2018
Messages
586
Location
Hungary - EU
I ended up doing the ahc lift today and did not cut the front heim joints. I just shortened them on both sides as far as they could go and moved the top connecting point as high as I could on the slotted bracket.

For the rear I just moved the connecting point as high as I could on the slotted bracket.

From what I read in this thread the high mode should still work. Now if I hit the button from N it will not go to H. Has anyone else experienced this after the ahc lift if they didn't modify the sensors? Thoughts/suggestions?
IMO shortening the fronts while also moving them to the top of the bracket is asking for too much (while the rear is only moved to the top of the bracket). IMO there is now a disagreement between the front and rear heights and that’s why it won’t raise.
 

BEG

Joined
Jul 21, 2016
Messages
729
Location
Mount Holly, NJ
I ended up doing the ahc lift today and did not cut the front heim joints. I just shortened them on both sides as far as they could go and moved the top connecting point as high as I could on the slotted bracket.

For the rear I just moved the connecting point as high as I could on the slotted bracket.

From what I read in this thread the high mode should still work. Now if I hit the button from N it will not go to H. Has anyone else experienced this after the ahc lift if they didn't modify the sensors? Thoughts/suggestions?
The AHC will not go into "H" if your neutral pressures are too high, as a safety feature. If you do a sensor lift, you are making the hydraulic component of the AHC work harder, thus increasing the pressure. In order to get it working correctly, you need to increase the load that the mechanical component of the AHC carries (the springs). Adjust your t-bars and shim/replace/airbag your rear springs as needed to get back within spec.
 
Joined
Aug 14, 2018
Messages
203
Location
Morrison, CO
Does my '07 look like it's had a sensor lift or is it stock? Everything I know about this truck says it should be stock but man it looks high. This was taken just after coming off the trail and starting to air up.



 
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