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Old 06-28-2011, 03:48 PM   #1
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acceleration problems

Have 2004 Winnebago, Vectra only 16000 miles. When I stop at intersections and when I start to move forward the engine stalls. I can push down on the accelerator and the engine shows no increase in RPMs, there is no smoke it starts at a crawl and slowly picks up speed. This is beginning to happen more and more frequently. You can shift gears nothing happens. I have taken it to the cummins people and they have looked at the transmission and all is OK. It appears to be in the electronics. Anyone had this problem. I have been told that I need to have the Freightliner people to do a diagnostic test which is expensive and they told me that if it doesn't stall when they are doing the test it will be for nothing.

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Old 06-28-2011, 05:28 PM   #2
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I always suspect the fuel filter. A diesel needs air and fuel to run properly. If they are getting that the computers would be next. So, replace the fuel filter and check to be sure the air filter is clear.

Larry B, Luckiest Dreamer
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Old 06-28-2011, 05:45 PM   #3
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How about a throttle positioning sensor?
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Old 06-29-2011, 06:37 AM   #4
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Do you have a Check Engine Light? If not then there is probably not a failure in an engine control sensor. I would change both fuel filters first because it is cheaper tha all other fixes. A turbo failure will also cause the same problem.
Mike Canter
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Old 06-29-2011, 12:59 PM   #5
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Question ? Any other performance issues ? Or is accel from a stop the only problem ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 06-29-2011, 04:55 PM   #6
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I had a similar problem just 2 months ago (cummins 340ISB @ 10.5K miles) The problem was intermittent and really appeared as if the trsnsmission was the cause. There was no codes displayed for any of the incidents. Sometime when I accelerated from a standing start it would just derate or stutter and not move until I jiggled the accelerator (it was like a car with a serious vacum leak and would just suck down)

Any way to cut a long sory short I replaced the primary and secondary fuel filters and all is well. Through the elimination process I went through I was able to determine it was the primary filter (Fuel/water separator) that was the main cause.

I would immediately replace both filters and hit the road. I think mine had been suffering for a while as it it definately running smoother in all uses.

Do the Filters & good luck

Michael Boyle
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Old 07-04-2011, 03:40 PM   #7
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Had simmilar problems but my check enjine light would come on and go off then power would come back.Replaced both fuel filters and lift pump still same code said injector pump so that is next mine would do better after rpms got up to about 1800 even with light on.If it is your injector pump look them up on ebay called dieselcare in memphis tn they rebuild them alot cheaper than new ones cost.

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