Autoride Mystery!

[Sarge]

09 Yukon SLT with Magnaride in front and AutoRide in back. Front has a 2'' spacers and rear has a 1/2''. Links have spacers on rear to adjust vs stock.

Anyways replaced the whole rear compressor unit about 6 weeks ago, went with Arnott complete replacement unit. Installed everything worked fine. Until about a week ago where it would keep turning on and 50% of the time the truck would air up, others it would just run but not air up. Figured the pump was bad.

Last week I replaced the pump again with a new unit. This unit was very quite vs the first so I figured my first one was bad. Installed pump, new relay, checked fuses and unhooked battery. All air hoses/ connectors where fine also. Everything was fine. Started, ran for about 30 secs, everything aired up fine.

Now a few days later its happening again. If i go out and start, it may run for 30 secs +/- and air up fine and hold until i let it sit before it releases air.

Sometimes i can start it and hear the comp kick on but truck does not raise up.

Sometimes if i turn the truck off and let it sit, try again it may air up but could take 60-90 secs.

Whats going on? Lines look good, shocks. No codes, ive discounted battery many times to "reset" system.

Almost like truck is getting confused and needs a hard reset for comp? When the truck does not air up, its not purging out either through the separate line.

Any help would be great!!! Thanks

 

[Sarge]

Did it this morning.

Started it, aired up fine, held.

2nd start, comp kicks on, truck does not raise.

3rd start, same, kicks on no raise

4th start, kicks and and raises. Holds.

Within 5 hours

Ugh

 

[Doubeleive]

maybe you have a faulty height sensor?, pull the air lines, reconnect air lines, run a scan in real time at startup to see what reading you get from sensors.
just an idea anyway...

 

[adventurenali92]

It your air shocks are totally shot and not holding air. 90% of the time, that’s what’s wrong and they compressor just keeps running to keep them full, despite the air leaking out of the shock. The rubber bladders on the air shocks are more than likely torn and don’t hold air.

 

[Sarge]

Shocks look great. I wouldn't think there is a leak, because when it works, it works. It will stay aired up all day when it works. Height sensor is a good idea.. need to find a big boy scanner.

 

[adventurenali92]

Shocks look great. I wouldn't think there is a leak, because when it works, it works. It will stay aired up all day when it works. Height sensor is a good idea.. need to find a big boy scanner.

Sometimes the leak in the bladder is small and the air will seap out slowly. Do your shocks hold air for more than a day at a time? Also have you had them aired up and then tested for leaks with soapy water?!

 

[Sarge]

Yes they have held all day and night before. Most of the time the system will purge when i park after it sits for a hour or so. I did spray soapy water when they aired up and let it sat, couldn't find leaks

 

[02Lightning]

I thought it purged some of the air off every time the vehicle is shut off. Then when started again, it would go thru it's test cycle and air up the system again.

 

[Sarge]

Mine sometimes purges after i park and lock it. Sometimes it wont. My system is just crazy

 

[al2fast]

Shocks look great. I wouldn't think there is a leak, because when it works, it works. It will stay aired up all day when it works. Height sensor is a good idea.. need to find a big boy scanner.

I got one of these scan tools. All sorts of live data I don't know what to do with for all the various sensors, reads the Z55 suspension codes, shows the voltages for the ride height sensors on all 4 corners. All it does is read and reset codes to the best of my knowledge, no relearn procedures.

https://www.amazon.com/iCarsoft-i90...qid=1517460463&sr=8-1&keywords=i900+scan+tool

 

[denalianyone]

If no codes than everything should be fine. That’s what happens when u don’t get an OEM unit. The others come on whenever they want at random times. I have an aftermarket one and it comes on when it wants but no codes. Just put your hand on the bladder and see if air is in there.


Sent from my iPhone using Tapatalk

 

[Sarge]

It comes on, just doesn't seem to push air half the time. Bladders are good. Going to try and get a live read on the hardware.

 

[al2fast]

I wonder if the exhaust valve on the compressor chamber is sticking, got another bum compressor? I've had an arnott for over 1.5 years now going through it's second WI winter and it has been solid. From what I've read and what I've experienced the system is supposed to fire up the compressor and before it starts it expels air for a second or two and then runs for a couple seconds, a self test. Loaded up at start up it will run longer. The only time my compressor doesn't run is when it throws a suspension code for my dying rear shocks (solenoid errors).

I was thinking maybe that intake tube up by the gas fill, but you said the old one was only a few months old and this one is brand new and doing the same thing. I don't know if there is some pneumatic valve in the air lines between the compressors and shocks that is maybe sticking not allowing air to blow to the shocks? Could you disconnect the air line from a shock and see if it's even blowing air, to rule out the compressor?

My rear shocks throw a solenoid circuit malfunction, open. They do this quite frequently now at 115k and my compressor does not even run. I wonder if yours could be failing in a closed state from time to time not allowing air into the shocks and the compressor just runs and runs? With my problem it just started with one shock and I could clear the code usually. Sometimes it would go for weeks and then all of a sudden I had that error on both shocks and it wouldn't clear. Finally cleared this weekend again and started working. Got new arnott shocks today to put in there. Would be curious if you can pull any codes with a scanner.

When I got my YD it had 75k and a dead compressor. Never once threw a suspension code until I got it tuned. After the tune reset the system the code came up but went away after I cleared it and never came back. I never realized this thing had air shocks! Did some reading and figured it out and let the dealer **** me for $100 to scan it and tell me it was the compressor.

 

[Sarge]

Its me again. So its still been only working when it wants. Comp kicks on startup each time but within the last month it only physical airs and raises the rear up 10% of the time. Again when it airs up it works and holds it. I readjusted my rear links one day it aired up perfect for a week straight. I wonder if the level sensors have to be just right to work or it throws off system?

Anyways now I hear this every time the air comp kicks and then I shut it off... sound of water is in the system and is bubbling out of the vent by gas filler (drips some water out also) VIDEO

Is there a drier that can go bad for the air comp? Ive had it scanned with a high end snap on scanner and went through the test to air but still only kicks on and doesn't raise. No codes!!!

Im so over this. But anyone have another idea before I swap the comp again (3rd time)? Again shocks look great, bladders look great and lines are not leaking.

 

[Sarge]

@01Konvict maybe you can shed some light ^

 

[adventurenali92]

Yes there is an air dryer that’s part of the compressor setup. And I know it can be replaced. I’ve jever had to do it. I just replaced my whole compressor as it was bad. And I haven’t had issues since. I replaced my OEM compressor with a dorman replacement unit, and while it’s noisy a bit, it works as it should. So not sure what brand compressor you bought, but that seems to be the consensus on which compressor unit to buy. Sorry not sure if that helps you or not.

 

[Sarge]

Ive tried 3 Arnott units

 

[Rocket Man]

When I bought my Arnott compressor it came with a dryer rebuild kit. Maybe they sell it separately? BTW my compressor will come on sometimes and only run for a few seconds, doesn't noticeably raise the rear. Most of the time it only tops off the air. It shouldn't be going up and down much unless there's a leak or you're hooking up a trailer.

 

[Doubeleive]

Its me again. So its still been only working when it wants. Comp kicks on startup each time but within the last month it only physical airs and raises the rear up 10% of the time. Again when it airs up it works and holds it. I readjusted my rear links one day it aired up perfect for a week straight. I wonder if the level sensors have to be just right to work or it throws off system?

Anyways now I hear this every time the air comp kicks and then I shut it off... sound of water is in the system and is bubbling out of the vent by gas filler (drips some water out also) VIDEO

Is there a drier that can go bad for the air comp? Ive had it scanned with a high end snap on scanner and went through the test to air but still only kicks on and doesn't raise. No codes!!!

Im so over this. But anyone have another idea before I swap the comp again (3rd time)? Again shocks look great, bladders look great and lines are not leaking.

lol, you made yourself a ****

 

[Sarge]

lol, you made yourself a ****

Ha its the trucks not mine I swear