1999 Expy LLS problem
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Junior User
Joined: May 2004
Posts: 70
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From: Chicago, Illinois
1999 Expy LLS problem
Hi all,
I replaced the LLS compressor about 1 year ago on my 1999 Expy EB 4X4. After replacing the pump it did raise the rear end but the pump seem to run all the time. It would come on while driving very frequently. Yesterday the rear end dropped while driving & I once again have a saggy rear end! The pump still turns on but will not pump up the rear end. Is it possible for the pump to turn on but to not raise the rear? Should I just replace the pump again? I don't remember who I ordered the pump from last time. Does anyone here have a recomendation as far as who to buy from?
Thanks in advance for everyones help!
John
I replaced the LLS compressor about 1 year ago on my 1999 Expy EB 4X4. After replacing the pump it did raise the rear end but the pump seem to run all the time. It would come on while driving very frequently. Yesterday the rear end dropped while driving & I once again have a saggy rear end! The pump still turns on but will not pump up the rear end. Is it possible for the pump to turn on but to not raise the rear? Should I just replace the pump again? I don't remember who I ordered the pump from last time. Does anyone here have a recomendation as far as who to buy from?
Thanks in advance for everyones help!
John
Senior User
Joined: Oct 2004
Posts: 418
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From: Richmond, TX
Originally Posted by johnkirk
Hi all,
I replaced the LLS compressor about 1 year ago on my 1999 Expy EB 4X4. After replacing the pump it did raise the rear end but the pump seem to run all the time. It would come on while driving very frequently. Yesterday the rear end dropped while driving & I once again have a saggy rear end! The pump still turns on but will not pump up the rear end. Is it possible for the pump to turn on but to not raise the rear? Should I just replace the pump again? I don't remember who I ordered the pump from last time. Does anyone here have a recomendation as far as who to buy from?
Thanks in advance for everyones help!
John
I replaced the LLS compressor about 1 year ago on my 1999 Expy EB 4X4. After replacing the pump it did raise the rear end but the pump seem to run all the time. It would come on while driving very frequently. Yesterday the rear end dropped while driving & I once again have a saggy rear end! The pump still turns on but will not pump up the rear end. Is it possible for the pump to turn on but to not raise the rear? Should I just replace the pump again? I don't remember who I ordered the pump from last time. Does anyone here have a recomendation as far as who to buy from?
Thanks in advance for everyones help!
John
Take a look at this thread, you might find that this is the fix for your problem.
https://www.ford-trucks.com/forums/s...d.php?t=382839
I had some of the same problems that you are experiencing. In the thread is the part number for the union. Also, you may not want to hear this, you probably did not have to replace the original pump, as this "union" will develope cracks that allow air to escape, thus causing the pump to run much more offten. The new union is a much better design.
If that is not your problem then I would get under the truck and start tracing the lines from the bags to the front, and see if there is a break anywhere.
Thread Starter
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Junior User
Joined: May 2004
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From: Chicago, Illinois
1999 Expy LLS problem
When you say "union", do you mean an electrical connector, or an air line connection? Is this under the drivers side floorboard or near the black box in front of the master cylinder.
Thanks.
John
Thanks.
John
Senior User
Joined: Oct 2004
Posts: 418
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From: Richmond, TX
The lines are a combination of metal and plastic. Where the union is it is plastic. I would first look for the union and see if it is broken, or has cracks in it. Most of the time when it is "broken", the peice has split in two, so you might find an "unconnected" air line near the box. If so then look for the other end of the line.
if the union is not the problem, then I would do an inspection of the rest of the air lines in the system. Easiest way is to get it on a lift, or get the rear on ramps so you can get under it to trace the lines.
if the union is not the problem, then I would do an inspection of the rest of the air lines in the system. Easiest way is to get it on a lift, or get the rear on ramps so you can get under it to trace the lines.
Thread Starter
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Junior User
Joined: May 2004
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From: Chicago, Illinois
1999 Expy LLS problem
I traced an air line from the LLS compressor to the area just below the black box & fuse/relay box in front of the master cylinder & there is a black hose connector that connects this line to another line that appears to run under the truck towards the rear end. I will inspect this hose connector. Should I disconnect the hoses at this junction connector, turn the ignition to on, & feel if air is being pumped out by the compressor?
You mentioned that I may not have needed to replace the LLS compressor in the first place 1 year ago, but after I did, the rear end raised & was fine.
Do you know if the compressor is turning on & running, does that mean that it must be pumping air? Or can the compressor still run when it may be bad?
Thanks again. I really appreciate your help!
John
You mentioned that I may not have needed to replace the LLS compressor in the first place 1 year ago, but after I did, the rear end raised & was fine.
Do you know if the compressor is turning on & running, does that mean that it must be pumping air? Or can the compressor still run when it may be bad?
Thanks again. I really appreciate your help!
John
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Junior User
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From: Chicago, Illinois
1999 Expy LLS problem
The air connector appears fine. The LLS compressor is coming on about every 60 seconds or so & running for about 20 - 30 seconds. Is there a sensor in the rear end that could be bad? Is it common to develop leaks in an air line?
Thanks,
John
Thanks,
John
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Thread Starter
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Junior User
Joined: May 2004
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From: Chicago, Illinois
1999 Expy LLS problem
Actually, there is a very small crack near the end of this air line connector but it doesn't appear to be enough to cause a problem. Anyway, I wrapped the entire connector with tape to see if the rear end would raise when the compressor ran, & it didn't.
John
John
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Joined: Oct 2004
Posts: 418
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From: Richmond, TX
Originally Posted by johnkirk
Actually, there is a very small crack near the end of this air line connector but it doesn't appear to be enough to cause a problem. Anyway, I wrapped the entire connector with tape to see if the rear end would raise when the compressor ran, & it didn't.
John
John
Are you sure the lines are connected to the compressor? If so, then start tracing the lines. Do you hear air leaking? Since you found the union (BTW, that line is what feeds the rear bags air) can you tell if air is being pumped past it?
Worst case you have a bag failure, but I would bet the problem is a disconnected / broken line.
Thread Starter
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Junior User
Joined: May 2004
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From: Chicago, Illinois
1999 Expy LLS problem
While inspecting the union air line connector near the black box, it became disconnected from the side that goes to the rear air bags, apparently due to the crack in the connector housing. There is air pumping through the lines so the compressor is working. Now I can't figure out how to disconnect the other side of the coonnector. There is a small brass piece that goes around the white inner line. How in the world do I get this thing off?
Thanks,
John
Thanks,
John
Senior User
Joined: Oct 2004
Posts: 418
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From: Richmond, TX
Originally Posted by johnkirk
While inspecting the union air line connector near the black box, it became disconnected from the side that goes to the rear air bags, apparently due to the crack in the connector housing. There is air pumping through the lines so the compressor is working. Now I can't figure out how to disconnect the other side of the coonnector. There is a small brass piece that goes around the white inner line. How in the world do I get this thing off?
Thanks,
John
Thanks,
John
Thread Starter
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Junior User
Joined: May 2004
Posts: 70
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From: Chicago, Illinois
Thanks. I got the connector off, now I gotta find one in stock at a ford dealer & hope that fixes the problem.
I'll let you know how it turns out in a couple of hours.
Thanks!
John
I'll let you know how it turns out in a couple of hours.
Thanks!
John