OM642 - Won't start - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 03-10-2019, 09:22 AM Thread Starter
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Date registered: Sep 2018
Vehicle: 2008 B200 Turbo, 2010 GLK350 4Matic, 2010 R350 BlueTec 4Matic
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OM642 - Won't start

Just acquired this car, in no running condition.
Has few klicks on it (275K km) but in very good shape.
Owner, few weeks ago, when got really cold coud not start it. Took it to repair shop, but ended up giving up on it, they where asking for lots of $$$ with no guarantees.
Here I'm.

Engine cranks good, no odd sounds. Brand new battery. But will not start.
I scanned for the codes, cleared all, cranked again.
Have 2 codes:
1. 13AF00 (current code) - soot contentof dpf too high
2. 10CB00 (stored code, can clear it but returns after cranking) - right intake port shutoff end position sensor defective

Are any of those codes will prevent engine from starting?
Is there any thing else I should check? Before really starting taking it apart?
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post #2 of 6 (permalink) Old 03-10-2019, 11:41 AM
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I would start with checking the intake flappers linkage as this would the the easiest to do.
See if you can move the flaps by hand-pushing the rod.
Than observe fuel pressure during cranking. Should be in 5000 psi range to start.
Would those codes prevent engine from starting?
I would not think so, but MB design lot of self-preservation programs in those cars and does not share the knowledge with owners, so lot of those things have to be learned by experience.
Chances are that even the code alone might not stop the car, when neglected for long time - it will trigger limp.


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post #3 of 6 (permalink) Old 03-12-2019, 12:50 PM
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Garage
Just went through 3 months of this with my parents car, 2001 cdi with OM613. Wouldn't start any time it got near freezing, which has been most of the winter.
No codes, just cranks and doesnt catch.
I replaced the fuel filter (over due), and every o-ring on every fuel line I could reach. Most showed some sign of leakage/dampness.
One of them seems to have been leaking (allowing air to be sucked in) bad enough to cause the no start.
Same thing happened on the 606 car last year.
I can only guess the 642 still uses the same types of connectors that use o-rings that harden and flatten out over time. The colder it gets the worse they seal.
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post #4 of 6 (permalink) Old 05-05-2019, 03:01 PM Thread Starter
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Date registered: Sep 2018
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It's a slow moving process as I do not have much time to work on this project.
But I found a reason of no start condition: compleatly plugged up DPF, I mean no flow at all.
I took it out and I'm in process of claning it (2nd run of Liqui Molly DPF cleaner). Without DPF car starts and runs very nicely now.

Anyone has good info/ideas how to clean DPF, other than Liqui Molly DPF cleaner? Looks like I made a nice progress but would like to make sure I did not miss some magic method, before I reinstall DPF (and it's not fun, very tight in that RH RR engine corner).
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post #5 of 6 (permalink) Old 05-05-2019, 06:55 PM
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Take to a diesel truck shop, they can clean the dpf for cheap.

--1998 MB E300TD 291k
--1997 MB E36 Frankenstein'd AMG 199k
--2011 Suzuki DL650 58k
--1997 MB E320 161k. SOLD...loved that stupid car.
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--1997 MB C36 AMG 273k -- stripped and junked
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post #6 of 6 (permalink) Old 05-05-2019, 09:36 PM
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Don't know for who'm $500 for ultrasonic cleaning is cheap, but I think this is the only good option.
Last resort would be DPF delete.


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