Air Spring Default Height

[Tahoe9813]

I recently replaced my rear air springs with the Arnott model from FCPeuro.com. The install was quick and easy, but when I reinstalled, I was partially back on the ground when they filled.

The bags are holding air, and I think I’m back to standard ride height, but I’m not 100% sure.

After some adjustments in ISTA, I tried resetting the ride height, but again, I’m not 100% sure.

Does anyone have a measurement for the OEM ride height in the rear? I have 19” OEM rims.

Thanks!

[shimmy23]

if you didn't touch the ride height sensors it should go back to normal

[Tahoe9813]

Originally Posted by shimmy23

if you didn't touch the ride height sensors it should go back to normal

I didn’t touch the sensors, but it didn’t go back to normal. I had gone into ISTA to deflate the bags (with the vehicle off the ground) (I did this three times), then I went through the fill procedure. That definitely helped, but it still seems a bit low.

Should the height at the front and rear match?

[stocktree]

Height is determined by the little arm sensor on the control arm

[shimmy23]

i dont believe they do. the front is a tad lower

[Tahoe9813]

Originally Posted by shimmy23

i dont believe they do. the front is a tad lower

If it’s a tad lower, then the rear is certainly sitting too low. It’s equal in the back, but it’s too low. How do I get it raised back up?

[Tahoe9813]

I just checked, and the rear is 1” lower than the front.

[shimmy23]

Originally Posted by Tahoe9813

I just checked, and the rear is 1” lower than the front.

ok stupid question but have you driven around at all? sometimes it can take the sensors a few miles to read height and then bring it back to height

[Tahoe9813]

Originally Posted by shimmy23

ok stupid question but have you driven around at all? sometimes it can take the sensors a few miles to read height and then bring it back to height

Yes. Many miles. I looked at the settings in ISTA for adjusting the ride height, but I must be entering them in the wrong place or not doing it correctly. Or, I’m using the wrong value.

[Tahoe9813]

I think I got it nearly there. I adjusted the settings in ISTA and reduced the amount by about 25mm (equal to about 1”). At this point, I’m within about 1/4”.

I am getting a periodic chassis error, and ISTA says that it’s an air timing issue. I’m fairly certain that the original desiccant is in the compressor, so I’ve ordered some from Amazon to replace it later this week.

The ride is good, though.

[suitedcboy]

The system has timeout for compressor to reduce moisture inside system. The system will usually gey it right on 3rd key cycle after a 20 min wait with doors closed and nothing disturbed and switched off. The system needs to go to sleep for the key cycle to be closed and another key cycle counted. If you messed with it after drive or key cycle then you interrupted the system getting back to normal. when they decided water in the system was taboo many years back they made the auto air systems on Euro brands aggravating. I've seen the same on Jeep grand cherokee owing to their Benz heritage for those couple of generations (probably applies to the Fiat ones too).