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Old 01-15-2013, 11:59 PM   #1
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MH pulsing while pulling hill.

I have a 1998 Diplomat 275 hp Cummins w/Allison MD 3060. Took mh to Pacific Power in WA. state Allison to check on shifting hard. Had tranny shift point changed when exhaust brake on from 3rd to 4th last year. Tech said all normal but felt surging/pulsing when pulling hill and loss of power for size of hill. Another tech checked with laptop and identified fuel lift pump pressure fluctuating and boost pressure sensor not reading correct. They replaced both and fuel filter, rechecked with laptop all ok. Took for test drive surging still there only while pulling hill. Rechecked with laptop now ECM is asking to get reprogrammed "foot printed". Only Cummins can fix and recommend not to drive. They say they did not foot print coach. I get stuck with $1000 of trouble shooting and repairs, Good Sam sent tow truck to haul to Cummins NW in Portland.Tow truck driver did not reinstall driveline? Cummins say's having trouble installing driveline and will cost $ for driveline to reinstall as they are having trouble reinstalling. Good Sam is taking care of that bill.Feel like Pacific Power should have stepped up some. Cummins NW did offer to send a tech to reprogram ECM but coach was on hook already and they even offered to lower price to reprogram. Why is MH pulsing during climb but goes away if I let off gas a bit?

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Old 01-16-2013, 12:11 AM   #2
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Bad injector? Or fuel filters?

1996 HR Endeavor LE, 5.9 Cummins 230hp
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Old 01-16-2013, 01:31 PM   #3
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You say Pacific Power replaced the lift pump and fuel filter then, I would make sure that the line is clear from the tank otherwise, you may be having injector pump issues which could have been caused by a bad lift pump supplying low fuel pressure. Either way Cummins should be able to pin point the problem. Good luck.

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1998 Rexhall Anthem 34' DP, Cummins ISB, Allison 5 speed, Spartan Chassis, 300 watts solar.
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Old 01-16-2013, 01:40 PM   #4
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you didn't say what kind of rpm you're pulling when it is surging. if you're up against the upper rpm of the engine the computer might be shutting you down to stop over rev. then when the rpms drop the computer says ok lets go. if thats not the way you drive sounds like a fuel problem. i'd install a presure gauge so i could monitor fuel presure when surging.
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Old 01-16-2013, 02:15 PM   #5
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You might have hit the nail on the head wonderer1. I pick up the coach today and go up the same hill by my house, I will look at RPM's. I never did get a code or anything. I might be asking to much of the 275 HP for a 24,000 pound coach? other than hills coach moves great with no indication of injection problem? Hope I don't eat my words. I will report on findings, Thanks all.
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Old 01-21-2013, 07:41 PM   #6
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Fuel lift pump was the problem. Can't say I notice a hp gain but no more pulsing. Thanks for the suggestions.
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Old 01-21-2013, 09:05 PM   #7
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Originally Posted by macielcrew View Post
Fuel lift pump was the problem. Can't say I notice a hp gain but no more pulsing. Thanks for the suggestions.
Glad you got it fixed, and thank you for reporting back with the resolution.

.2012 Fleetwood Bounder 33C | 2012 Jeep Wrangler

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