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Old 10-16-2017, 09:15 PM   #1
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Chugging from a dead start on DP

We have a 2000 Damon Class A DP with a Cummins 275 HP diesel. 85k miles. The last couple of trips Iím noticing it takes longer to get going from a dead stop (stop light, etc). Add a hill or incline and itís nerve racking. Little if any difference without the TOAD. Same on hills. Just seems like we are losing power. We keep it current on maintenance like oil change etc. Any advice from the forum?
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Old 10-16-2017, 09:20 PM   #2
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If you have an exhaust brake , and are using it while coming to a dead stop , there may be a delay in the exhaust brake valve opening when you try to accelerate .
Try turning the exhaust brake off in town and see if there is any change in the issue.

Your 2000 5.9 Cummins is equipped with a VP-44 high pressure fuel injection pump and an electric lift pump that can also be an issue , but try the exhaust brake first.
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Old 10-16-2017, 09:23 PM   #3
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Have you changed the fuel filters recently? That is the first place I would start.
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Old 10-16-2017, 09:35 PM   #4
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My first coach had a 5.9/230 engine. I suspected that it had a faulty wastegate valve and was not building boost pressure at low speeds. At highway speed, the power was fine; that's why I suspect the wastegate valve.

That may not be your problem, but it might make sense to check it.

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Old 10-17-2017, 07:16 AM   #5
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I don’t use exhaust brake in town, but having a look at the fuel injector pump might be worth a shot. I need to check my records whether the last PM included fuel filter. Thanks for the suggestions.
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Old 10-17-2017, 09:36 AM   #6
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Possibilities, in order of likelihood, include a dirty fuel filter, dirty air filter, a defective turbo-charger, or an exhaust brake stuck in or near the closed position.

Start by changing the fuel filter, even if it is not that old. It's the #1 suspect by far.
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Old 10-17-2017, 09:57 AM   #7
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A fellow RVer came into a park we were at, his rig chugging and his complaint much like yours.

Although his dash panel has a Water In Fuel warning light, it had burned out. He never noticed that most of his dash lights didn't light up during their test cycle at start up when turning the key. (all vehicles do this)

He also didn't know that his primary fuel filter had a water drain sump on the bottom of it. I crawled under his coach and showed him and we drained the filter while the motor was running. A gush of rusty water flowed out of the drain and once it was purged the coach's engine started to run smooth again.

This allowed him to get to a service shop to have the filters changed as well as have someone check his fuel tank which was loaded with debris. The shop was able to purge the tank and clean and treat it to remove the rust. It was a costly repair but cheaper than having to replace pumps and injectors.

Lesson he learned...use the coach more. Don't let it sit for months will little if any fuel in the tank and use fuel additives such as SeaFoam to keep your fuel system in optimal condition.
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Old 10-17-2017, 10:09 AM   #8
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When the same thing happened to me it was the fuel filters full of gunk. Please let us know what it ends up being.
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Old 10-17-2017, 06:44 PM   #9
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What is your boost gauge showing? It is possible this is a problem with the turbocharger, or a stuck waste gate.
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Old 10-17-2017, 06:55 PM   #10
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If you need a new pump, give Blue Diamond Diesel a look....Should have a code stored
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Old 10-17-2017, 09:41 PM   #11
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One other thought. Does your Allison tranny have an economy mode? In economy, it shifts differently. And you don't get as much power.
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Old 10-18-2017, 08:13 AM   #12
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Quote:
Originally Posted by Gary RVRoamer View Post
Possibilities, in order of likelihood, include a dirty fuel filter, dirty air filter, a defective turbo-charger, or an exhaust brake stuck in or near the closed position.

Start by changing the fuel filter, even if it is not that old. It's the #1 suspect by far.
Good advice and it seems consistent with others. Thanks.
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Old 10-18-2017, 08:39 AM   #13
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Quote:
Originally Posted by psandoz View Post
Good advice and it seems consistent with others. Thanks.
Could always add a fuel pressure gauge on the filter housing....mine has two ports on top...one on inlet side and one on outlet....
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Old 10-18-2017, 11:47 AM   #14
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Thumbs up Clugging

Thanks to all the readers and great advice. When we get home next week first order of business is change the fuel filter and drain water in fuel. I'll keep the forum posted of progress.
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