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Old 11-21-2017, 05:22 AM   #11
Bvaughan83
 
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Default Re: Acceleration Issue - HELP!

I purchased a 2010 144" this summer with 100,000 miles on it. I have the same issue, no throttle response under load, if the vehicle cannot move at idle speed it will do nothing. Ive taken it to the local dealer and a few other shops in town and no luck yet. Your not the only one with this problem. Any updates or other ideas from other would be helpful for me too. Thanks
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Old 11-21-2017, 07:51 AM   #12
ptheland
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Default Re: Acceleration Issue - HELP!

Another question: Do you have the same problem in reverse?
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Old 11-21-2017, 10:07 AM   #13
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Default Re: Acceleration Issue - HELP!

A very perplexing problem! I'm no Sprinter mechanic, but I can't help but think (and please correct me if my understandings are incorrect!) :

1) This vehicle is completely computer-controlled, "drive-by-wire."
2) Can the engine be revved when it's in neutral? (Does the accelerator position sensor function normally?)
3) When at idle and shifting into gear, is any pressure (a "thunk") felt, indicating the DRIVE shifter position has been established and it's "in gear"?
4) Are there a set of conditions, perhaps a safety feature, in which the ECU will de-couple --refuse to recognize-- the accelerator pedal position sensor and/to prevent the vehicle from moving? (Perhaps something similar to shifter locking in Park if the brake pedal's not applied?)
5) What are the differences in computer sensors/inputs as to when the vehicle is stationary vs. moving? Torque applied to the engine causing it to shift slightly?

I'd be trying to learn these things, but... could the ABS system/wheel speed sensors have something to do with this? Just a guess! Sure sounds like an intermittent electrical issue.

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Old 11-21-2017, 11:51 AM   #14
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Default Re: Acceleration Issue - HELP!

WOW, I feel slightly relieved I am not the ONLY one with this problem.

OK, lets answer some questions.

1: Yes, electronically controlled.
2: Yes the engine is fine in neutral and can be revved.
3: Yes, when placed into gear, it wants to move on it's own. (Yet if somthing is in front of it, like a speed bump, then it wont move and you are stuck)
4: I dont know :(
5: Again, not sure.

I thank you that we are throwing things and ideas out there.
My thought was some kind of gearbox sensor failure, that wont recognise the gearbox spinning.
Not sure if there is such a thing.
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Old 11-21-2017, 01:38 PM   #15
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Default Re: Acceleration Issue - HELP!

So if I understand your symptoms correctly: if--

a) engine is running, at idle, with no warning lights on
b) parking brake is off
c) foot brake pedal is not being pushed
d) transmission is in D --in gear-- but "bumping" against something so it won't move forward on its own

then, if you press down on the accelerator pedal, engine will not increase rpm? Nothing happens? Does anything happen?

And the other good question: does this also happen in reverse?
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Old 11-21-2017, 03:14 PM   #16
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Default Re: Acceleration Issue - HELP!

Do you have "ParkTronic" with the sensors in the front and rear bumpers?
Could be that the sensors are looking down rather than forward maybe?
Do the front and rear Parktronic lights illuminate in a sequence?
Roger
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Had 2006 T1N 3500/158|2010 NCV3 519/3500/144|2011 & 2012 NCV3 519/3500 170
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Old 11-21-2017, 04:00 PM   #17
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Default Re: Acceleration Issue - HELP!

irvingj you've got it correct, and its the same thing in reverse.
sailquik, I do not have the parktronic
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Old 11-21-2017, 05:55 PM   #18
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Default Re: Acceleration Issue - HELP!

Great thought, Roger! I forgot that many new vehicles have got that sort of thing... too bad it doesn't seem to be the case here, if a Parktronic system isn't involved...

Bvaughan and Supa-- next thing I'd do --and keep in mind I'm NOT a Sprinter technician, I'm just going through some pretty basic logic here-- is to get a live feed scanner on there to see if there's any registered change in "throttle" position while stepping on the accelerator pedal, in those conditions listed above. My TDI VAG-COM software will show this on my VW. Not sure if it's called the same as on a gasser, I know diesels really don't have throttles.... but I think it's still called "throttle position."

If it shows appropriate change (on my VW it's shown as a percentage, IIRC), then that's working and I'd start looking downstream, maybe at the ECU. If no change registers when accelerator pedal is moved, I think I'd look at wiring harness(es) first, just to see if there's any physical movement involved when the transmission is put in gear and "bumped" against a stop. At least, to eliminate a physical/mechanical issue. I really can't envision a problem with the torque converter or transmission if the engine just won't increase rpm when the go-pedal's pushed.

Did any of these shops you've been to have the real MB software stuff to do a thorough analysis? If either of you are near Colorado, I'd make a beeline for Dennis!

In any case, a real head-scratcher; hope you guys can get it figured out -- and keep us posted!
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Old 11-21-2017, 06:01 PM   #19
ptheland
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Default Re: Acceleration Issue - HELP!

I would be inclined to rule out the accelerator pedal by trying another one. I kind of doubt that is the sole problem, but it not a difficult part to swap out just to test.
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Old 11-21-2017, 08:02 PM   #20
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Default Re: Acceleration Issue - HELP!

Well being old school I would suggest doing a full stall test first!
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