[wrldky]

My system has not been working for a while and I love it. No more constant hum of the EAS compressor. Honestly it always drove me crazy. Here is the problem though and I thought it might be obvious from the symptoms.
The compressor runs fine I have to jump it off the battery though because when I try to jump it from the relay or under the drivers seat it will not run.
After I pump it up to the desired height and I am driving around everything is fine.
Once I turn the car off however the car sinks (lowers) rather noticeably.
First thought would be that there is an air leak somewhere but after I pump up the system and unplug the harness from the drivers seat and the pull the relay i can drive around for weeks without having to pump the system up manually to adjust the height. (there is a slow leak somewhere)
So what causes the sudden drop once the engine is turned off?

Thank you.

 

[Scotty]

It sounds like your block needs a rebuild, If the car drops sunddenly that would make me think the block is being exausted. Maybe replace the driver...

Good Luck Scotty

 

[shupack]

something isn't right, the compressor shouldn't give a constant hum.

It should work when jumped at the relay, sounds like a wiring problem.

The sudden drop is likely self-leveling trying to get things right, small leak coupled with an out-of-whack sensor. May need a calibration, may need a new sensor.

 

[wrldky]

"It sounds like your block needs a rebuild, If the car drops suddenly that would make me think the block is being exhausted. Maybe replace the driver..."

Scotty,

Would this happen only when the truck is shut off yet not when it is driving? Remember the pump is turned off so it is not supplying air to the bladders during operation.

 

[viperover]

Consider age of Valve blaock and related parts, if its getting on Valve block re-seal, possibly new solennoid driver pack along with Compressor rebuild or replace with larger capacity

 

[wrldky]

Not so Simple EAS Question

Thought I would try this again to see if there are any new answers. Just a note the compressor runs perfectly. It has no problems pumping the air bags up. The truck has no problem staying pumped up when it is on. But when I shut it off it drops suddenly. It can not be an air bag leak. I can not get the compressor to run from jumping it at the relay or from the harness under the drivers seat.

My system has not been working for a while and I love it. No more constant hum of the EAS compressor. Honestly it always drove me crazy. Here is the problem though and I thought it might be obvious from the symptoms.

The compressor runs fine I have to jump it off the battery though because when I try to jump it from the relay or under the drivers seat it will not run.

After I pump it up to the desired height and I am driving around everything is fine.
Once I turn the car off however the car sinks (lowers) rather noticeably.
First thought would be that there is an air leak somewhere but after I pump up the system and unplug the harness from the drivers seat and the pull the relay i can drive around for weeks without having to pump the system up manually to adjust the height. (there is a slow leak somewhere)
So what causes the sudden drop once the engine is turned off?

 

[shupack]

Re: Not so Simple EAS Question

The compressor runs fine I have to jump it off the battery though because when I try to jump it from the relay or under the drivers seat it will not run.

that is most likely a problem with your wiring.

 

[viperover]

Check earth connection by EAS box.....your driver pack maybe seriously gone.
I've had a rangie in with a blown driver pack, when I removed valve block and pack it had shorted out on body of valve block