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Old 08-04-2020, 03:59 AM   #61
Rivet Master
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2007 Interstate
League City , Texas
Join Date: Oct 2014
Posts: 5,610
Originally Posted by Titus View Post
When you say that it is only at start up, do you mean that you reach full boost when doing this same test on a fully warmed up engine. You only see maximum boost (whatever pressure that is) when the engine is at high speeds under high load. ....
I could drive until doomsday with no boost at all, regardless of engine temp. The only thing that fixes it is to turn the engine off and on again. It resets the computer, or something.

It tends to happen after the van has been sitting a few days. There might be a correlation with humidity - I can't tell yet.
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Old 08-04-2020, 08:34 AM   #62
Rivet Master
2013 Interstate Coach
Raymond , Iowa
Join Date: Jun 2014
Posts: 1,290
That is odd. Can you tell a difference in power? Is there really no boost (low power) or is the readout just saying no boost? Does your readout have some indication of fuel flow - mm3 per stroke or some sort of instantaneous fuel read-out? If so, is that value lower under your acceleration test when reading no boost than it is when accelerating with higher boost? The allowable fuel flow should be a function of boost (but maybe not the boost value that you are seeing on your readout???) and I am wondering if fuel flow (power) is actually lower with no boost. Your MY is right on the borderline of where they would use a diesel particulate filter. If there is no DPF, are you seeing more black smoke out the exhaust when accelerating under the no boost condition? I used to work with a Daimler engine emissions engineer and could contact him about this if you'd like.
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Old 08-05-2020, 08:12 AM   #63
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2006 22' Interstate
Port Angeles , Washington
Join Date: Sep 2016
Posts: 858
I think you really need the factory diagnosis software (and hardware) to find isolate it.
It will give a lot more information and will show errors that will not set a light.

I have a ‘knock off’ of the setup that works well- I carry it with me on long trips.

Freightliner gives a 3 year warranty with replacement MB engines, may want to contact the dealer.
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