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Old 12-22-2020, 12:07 AM   #1
wfeffer
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Default 1996 Tourmaster lurching issue

I've got the oddest issue hopefully I can properly explain it. 3 years ago when I first bought the RV I noticed that the cruise control didn't work well. When I'd set the speed the rig would start to jump gears back and forth between 5 and 6. So I didn't use it again for a year or so and then tried again but thought perhaps the engine brake being on didn't jive well with the cruise control so I turned it off and it worked great.

Suddenly a few days ago 2000 miles into a cross country drive the issue returned. I started flipping the engine brake on and off, the cruise main switch off and on and after some combo it seemed to work again. This happened a couple more times and flipping switches always seemed to "reset" it.

Today the issue returned and wouldn't stop so I drove without cruise but then I started to get random lurches. At first I thought it was dropping into 5th or 4th but it happened so quickly I couldn't look at the Allison gear selector, but I could see the RPMs actually dropping when the lurches happened.

So I'm wondering if something in my engine braking system is malfunctioning I think I have an exhaust brake as I can't hear the stereotypical big rig rat a tat tat you get with a jake brake. Where is the valve located on the exhaust? Can I disable it to test my theory?

Cummins M11 400HP engine and Allison transmission
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Old 12-23-2020, 08:02 PM   #2
wfeffer
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Any thoughts? Bueller? Bueller? Bueller?
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Old 12-27-2020, 10:46 AM   #3
Hansonclan
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Have it scanned for codes first
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Old 12-27-2020, 03:10 PM   #4
mitch51
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Default mitch51

I own a 2006 Endura with a 5500 Chevrolet Duramax diesel. I had the same type of problems with mine right after buying it. i took it back where I bought it and come to find out it needs to have the fuel filter changed out every 10000 miles. After that was done I didn't have any more problems. You may have the same problem if you have a diesel.
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Old 12-28-2020, 11:26 PM   #5
wfeffer
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Interesting. I would do that, but I cannot find my fuel filter. It's not where the manual says it should be and I've checked everywhere around the engine bay and all the way up to the fuel tank....
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Old 01-11-2021, 02:58 PM   #6
dougdhc
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Have you tried turning off the engine brake
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Old 01-11-2021, 04:34 PM   #7
mitch51
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Did you find the fuel filter or anything else to fix your problem? Good luck!
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Old 01-11-2021, 06:47 PM   #8
wfeffer
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Of course I tried turning off the engine brake. It’s almost always off unless I’m going down hill.

I still haven’t resolved the issue. I’ve tried a number of things from gas additives, replacing the engine brake switch checking all the connections and fuses and hunting for the fuel filter which is still MIA. I have an appointment with Cummins on Monday in Phoenix. Hopefully they can figure it out. I think it’s a stuck solenoid in the jake brake.
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