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Old 11-27-2014, 08:05 AM   #43
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Well took me till last night but I finally got it !!!!! YES!!!!

Turned out to be all about that Econ valve, after replacing it with a new one and the governor and the pressure protection valve, with no results ,
I started looking at how this thing was plumbed with air lines,

The thing that got me to wondering was the new econ valve had a pipe plug in the port for the "makeup air" line that has the "special" check valve from the wet tank,

Seems that "Make up" air line is for Cummins Holset Model SS338E only my compressor is Model SS296CE

After removing this line and plugging the fittings, She purges at 120 psi and holds that pressure until the brakes are pressed a few times to bleed off the tank, then the compressor starts building pressure again until the next purge,

I also went through the compressor Unloader valve check twice because I really thought this was the problem ...so glad my compressor was fine , it looks like a nightmare to take out,

I also found a leaking rear height control valve, after removing it and putting air pressure to it, found a loose plate on the back that just needed the screws tightened , went ahead and put lock tight on those screws ,

I almost lost my mind on this whole thing, I worked on this for four full days, I crawled under this thing more times than you can imagine,

I hope my fuel mileage goes up after all this,

this only applies to older (I think 1997 and older) motorhomes with the Cummins/Holset Compressor, model E and QE

Haldex Isolation Valve
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Old 11-27-2014, 08:13 AM   #44
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Quote:
Originally Posted by benford View Post
Well took me till last night but I finally got it !!!!! YES!!!!

Turned out to be all about that Econ valve, after replacing it with a new one and the governor and the pressure protection valve, with no results ,
I started looking at how this thing was plumbed with air lines,

The thing that got me to wondering was the new econ valve had a pipe plug in the port for the "makeup air" line that has the "special" check valve from the wet tank,

Seems that "Make up" air line is for Cummins Holset Model SS338E only my compressor is Model SS296CE

After removing this line and plugging the fittings, She purges at 120 psi and holds that pressure until the brakes are pressed a few times to bleed off the tank, then the compressor starts building pressure again until the next purge,

I also went through the compressor Unloader valve check twice because I really thought this was the problem ...so glad my compressor was fine , it looks like a nightmare to take out,

I also found a leaking rear height control valve, after removing it and putting air pressure to it, found a loose plate on the back that just needed the screws tightened , went ahead and put lock tight on those screws ,

I almost lost my mind on this whole thing, I worked on this for four full days, I crawled under this thing more times than you can imagine,

I hope my fuel mileage goes up after all this,

this only applies to older (I think 1997 and older) motorhomes with the Cummins/Holset Compressor, model E and QE

Haldex Isolation Valve
Glad you figured it out and it is fixed! fuel mileage increase? Happy Turkey day
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Old 11-27-2014, 10:44 AM   #45
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Thanks for sharing this problem with us. Very informative and helpful! I learned a lot just following this thread! This forum is the greatest!!!!
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Old 11-27-2014, 07:46 PM   #46
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Glad you figured it out and it is fixed! fuel mileage increase? Happy Turkey day
Hey don't squash a mans dream.....LOL!!!!

Hope your Turkey day was as good as mine....Got my elastic waistband sweats on.....OH HOW SWEET IT IS TO BREATHE!!!!!
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