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Old 01-03-2009, 06:49 AM   #1
MT45 WALKER
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1999 Freightliner MT45

I just purchased a 99 Freightliner Step Van with a Cummins/Allison powertrain combination. It was a former DHL delivery step van, which I want to convert to a mobile business. My route home includes an 8 mile incline up to approximately 3,500 elevation.

I heard of speed limiters, but at 35mph?

Please help! I need the need for speed so that I can make it home for dinner.
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Old 01-03-2009, 01:02 PM   #2
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This would be a FCC (Freightliner Custom Chassis)?

If you have the I-6 Cummins and the AT545, that should not be ANY form of power problem in a light vehicle like that and there is no way DHL had a RSL set to 35MPH, that would be a Federal violation if used on an interstate.

Does the vehicle attain "full throttle" at the engine?

Is the engine electronic or mechanical?

Does the transmission have FOUR forward speeds (gears)?
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Old 01-04-2009, 11:24 AM   #3
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Thanks John.
She can eventually reach 50mph on flat grounds, but uphill, no can, and that is with no load.

I am not sure what you mean by "full throttle" at the engine. Electrical or mechanical? Sorry.

I will have to check regarding the forward gears. If I recall correctly there was four.

She has approximately 180k miles.
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Old 01-04-2009, 05:31 PM   #4
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Do you know the exact model of the engine in the truck? That will tell us if it is a completely mechanical fuel engine, or an electronic one. It matters because if it is a mechanical one, most likely, the accelerator linkage is not getting the engine to "full fuel" which explains your problem.

If however, it is an electronically (computer) controlled fuel system, that IS a different story.
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Old 01-05-2009, 08:30 PM   #5
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It is a 24 Valve Cummins ISB - ELECTRONIC. What's the story on these types? Thanks.
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Old 01-05-2009, 09:50 PM   #6
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They like to eat Injection pumps.. one possible cause for your low power. There is a lot of diagnostic info in the Dodge forums elsewhere in this site that should help you out... But the first step I would take would be to get someone knowledgeable to hook up a laptop, checked for logged fault codes, verify sensor readings, etc.
I would also check the turbocharger for damage or play, and check for Aftercooler leaks as well as piping for the Aftercooler.
Should of course also check your air filter, replace fuel filters, etc.

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It is a 24 Valve Cummins ISB - ELECTRONIC. What's the story on these types? Thanks.
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Old 01-08-2009, 05:33 AM   #7
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Thanks. I will try to find someone here locally.
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