Front suspension problems

Discussion of STOCK air springs, struts, shock absorbers, shocks, compressors, air driers, lines and systems.

Front suspension problems

Postby hadawayboy » Thu Feb 22, 2018 2:12 am

1990 Lincoln mark vii

So the problem at hand is the front suspension, more on the d/s then passenger. Tire sits up in wheel well and doesn't have that gap like rear.
Now I've replaced all bags with new and even put on new shocks and struts. So I know it can't be the bags. So what do you guys think could be the cause? I'm gonna try to adjust the ride height sensor and see if that fixes the problem. Does anyone know how to test the sensors? Is there so much resistance I should be getting if I put a multimeter on it?
Thanks for any help in advance.
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Re: Front suspension problems

Postby hadawayboy » Thu Feb 22, 2018 2:13 am

And I wanna add that it sits noticeably low in front while rear sits at normal ride height!
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Re: Front suspension problems

Postby CDW6212R » Thu Feb 22, 2018 4:39 pm

The front height is adjustable, easily, to three levels. The adjustment is at the bottom of the height sensors. Loosen the one bolt there, using a Torx bit, and note the hole it goes in is really a long slot. The slot has three circular locations where the bolt can tighten into. The stock position is the middle one. Move it to the top one to raise it some, both sides.
Don
1991 Red Special Edition, my 2nd SE, dead paint, DWS 255/45/17's on 95 Cobra wheels, and soon; DVD/Navi/backup camera, OBDII and the 347, before custom paint.
98 Mountaineer with Continental DWS 255/55/18's, big sway bars, custom brakes. Soon to be A4WD with XP8 bumpers and wing.

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Re: Front suspension problems

Postby 2manymarks » Fri Feb 23, 2018 12:23 am

:? So you replaced all airbags/springs and the car is not level. My guess is that you have one leak in the front. The rear has only one sensor and is doing it's job. The front has a sensor on each side and are probably working ok-don't adjust them until you find the leak in the driver side line or solenoide. As it leaks, the sensor on the passenger side keeps trying to maintain level but follows a little behind the leaking side, hence it is a little higher. Find that leak before trying to adjust the sensors. Just for s and g, do you remember the order you replaced the air springs? Did you do the driver side front first or last? :roll: 8-)
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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Re: Front suspension problems

Postby hadawayboy » Fri Feb 23, 2018 12:44 am

I replaced the p/s I believe then the d/s. Then the rear bags went bad and I replaced them a week later. I'll do the soapy water test on the solenoid and air lines up front
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Re: Front suspension problems

Postby WHITEOXLSC » Fri Feb 23, 2018 10:43 am

The front is much heavier than the rear, the compressor may be "timing out" due to a leak and will not inflate the springs all the way to trim level. Check the line connections at the compressor itself, as big leaks here will cause this. Oh forgot to ask, does the check suspension light come on after compressor stops? :idea:
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Re: Front suspension problems

Postby hadawayboy » Fri Feb 23, 2018 11:11 am

I couldn't tell you if it's after the compressor stops or not because it's when I'm driving but about a couple minutes or so after driving my light will come on
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Re: Front suspension problems

Postby 2manymarks » Fri Feb 23, 2018 11:30 am

hadawayboy wrote:I couldn't tell you if it's after the compressor stops or not because it's when I'm driving but about a couple minutes or so after driving my light will come on


with car parked, turn ignition off. open trunk and find system on-off switch. open hood to observe compressor. start car and observe compressor=time operation (should be about 3 minutes). as soon as it stops, turn system off at switch in trunk. observe all wheel heights and listen for leak. A significant leak should time out the compressor to keep it from overload. 8-)
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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Re: Front suspension problems

Postby hadawayboy » Mon Feb 26, 2018 10:51 am

So I didn't see the last post before I looked at it thisb weekend. And I will try that tonight. But I did the soapy water test around the front bags and the solenoid and lines going in and there is no leak! But if I pour it on the air lines coming out of the top of compressor it's a fountain of leaks! I didn't know if there were suppose to be springs up there or not! I didn't see any. So I tried the adjusting the front ride height sensors from middle to top and now my whole car sits like a low rider ready for a car show!
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Re: Front suspension problems

Postby 2manymarks » Mon Feb 26, 2018 11:44 am

The air suspension height sensors are very rarely a problem and the allowed adjustment from lowest to highest is only about an inch I think. I don't believe that is the problem.

I am not sure what you mean when you said you weren't sure if there "springs" up there or not?? If you haven't replaced the dryer, and the soapy water test shows a lot of leakage, then it looks like a new or rebuilt one may be in order. It may have gotten saturated due to excessive use brought on by the previous leaks. I haven't checked recently, but a rebuilt one may be about $25. It will get you new dryer dessicant and new airline "o"rings. See a tech article on how to change it. It is not difficult but care in handling airline insertion is crucial. You can rebuild the dryer fairly easily but it means finding the right size o rings for the airlines (4) and also the larger one that goes between the compressor and dryer. Also, I think there may be two different dryers-maybe only the connector.

After replacing the dryer, if that doesn't fix it, you might have to make sure the lines are clear. If moisture got in them and it froze, the blockage could restrict the input to the solenoide.

Actually there is a couple great tech articles you need to look at right on our website!
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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Re: Front suspension problems

Postby hadawayboy » Mon Feb 26, 2018 12:56 pm

Not springs *o-rings on top of compressor.
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Re: Front suspension problems

Postby hadawayboy » Mon Feb 26, 2018 12:58 pm

Thank you so much for all the help! Ill look into rebuilding then. And hopefully post some updates of good news.
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Re: Front suspension problems

Postby 2manymarks » Mon Feb 26, 2018 3:48 pm

hadawayboy wrote:Thank you so much for all the help! Ill look into rebuilding then. And hopefully post some updates of good news.



Please look at the tech article as they are very thorough and informative on this problem. 8-)
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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Re: Front suspension problems

Postby hadawayboy » Mon Feb 26, 2018 3:55 pm

Yeah I just found the o ring article so it doesn't say where at on the lines going into compressor but I'm defiantly missing o rings. I'll probably replace the whole setup rockauto has for fairly cheap. Probably well overdue
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Re: Front suspension problems

Postby hadawayboy » Mon Feb 26, 2018 10:04 pm

So I did the compressor test you asked where you let it run and it will time out and see how far it drops.
1st- pump ran for 6 min before it finally shut off
2nd- car didn't even raise a bit, all 4 tires sitting in wheel wells!

Note:the front ride height sensors are at the top notch
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Re: Front suspension problems

Postby CDW6212R » Tue Feb 27, 2018 12:57 am

That sounds like big enough leaks to stop it from raising. Make up a bottle of dish washing soap and spray the connections while it runs, spray the base of the air bags too.
Don
1991 Red Special Edition, my 2nd SE, dead paint, DWS 255/45/17's on 95 Cobra wheels, and soon; DVD/Navi/backup camera, OBDII and the 347, before custom paint.
98 Mountaineer with Continental DWS 255/55/18's, big sway bars, custom brakes. Soon to be A4WD with XP8 bumpers and wing.

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Re: Front suspension problems

Postby hadawayboy » Tue Feb 27, 2018 1:26 am

It's got new bags all around so I know that's not the issue. The top of compressor 4 lines running out are leaking like alot when I spray soapy water on! I'd post the pic but don't know how
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Re: Front suspension problems

Postby CDW6212R » Tue Feb 27, 2018 9:25 am

There's a thread here that describes and shows the line connections well. John did a great job explaining how they come apart, and what to service in them. Find that and if the tiny plastic collars are still okay in them, you can fix yours without buying a new drier. I think I paid about $40 for the one in my 99 Explorer(similar with only two outlets).
Don
1991 Red Special Edition, my 2nd SE, dead paint, DWS 255/45/17's on 95 Cobra wheels, and soon; DVD/Navi/backup camera, OBDII and the 347, before custom paint.
98 Mountaineer with Continental DWS 255/55/18's, big sway bars, custom brakes. Soon to be A4WD with XP8 bumpers and wing.

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Re: Front suspension problems

Postby hadawayboy » Tue Feb 27, 2018 10:42 pm

So I just ordered a new dryer, and I cleaned up the compressor!
I can't seem to find where at on top of the compressor the o rings go though? I looked through the o ring article, but it doesn't show or say specifically.
Also I can't find it in any tech article, but what is the Schrader valve on the compressor for? Is it to manually air up the bags?
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Re: Front suspension problems

Postby 2manymarks » Wed Feb 28, 2018 2:18 am

hadawayboy wrote:So I just ordered a new dryer, and I cleaned up the compressor!
I can't seem to find where at on top of the compressor the o rings go though? I looked through the o ring article, but it doesn't show or say specifically.
Also I can't find it in any tech article, but what is the Schrader valve on the compressor for? Is it to manually air up the bags?


Yes, you can use the valve to manually fill the system. System needs to be "on".

:roll: The air lines do not go into the compressor, just into the dryer. The air the compressor supplies goes into the dryer, then exits out the top where the airlines plug in (and where the small "o" rings are seated) and is delivered to each of the air springs/bags through the solenoides which the computer/controller sends signals to open or close as determined by the height sensors. Stop looking for airlines into the compressor- the lines are only distribution lines "out". 8-)
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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