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  #16  
Old 03-17-2019, 01:03 PM
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99% sure this is your problem:

Those engines have "swirl flaps" which agitate the air coming into the engine. The motor that controls the swirl flaps usually burns out on these cars. When the car detects that this motor is no longer working, you get a CEL and limp home mode.

This motor and the flaps are not necessary for the engine, its just an emissions thing. Nobody wants to pay $2k to fix this so there is a $0.50 fix. What we do is put a resistor on the electrical connector going to the motor. This fools the computer into thinking that the swirl flap motor is working fine. I've had this fix on my ML for 1 year now with no negative consequences.

This 3 part video explains it very well

https://www.youtube.com/watch?v=9h5cHBRPl9c
https://www.youtube.com/watch?v=xs4lCatM1UY
https://www.youtube.com/watch?v=aapZZo840MA&t=1s

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  #17  
Old 03-20-2019, 07:12 PM
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New air filters anyone?

I'm not so sure plugged engine air filters weren't the root cause. Both are plugged solid what looks like at least 50%. Unfortunately she has been taking car to dealer for all her service. I don't remember right off the top of my head but is air filter covered under A or B service?

Got some new filters coming and will update post upon completion.
Attached Thumbnails
OM642 burning oil - anyone see issues with rings?-mbshop-engine-air-filter.jpg  
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  #18  
Old 03-20-2019, 08:35 PM
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Wow.....my GLK still had the original filter in it at 70k and it didn't look half that bad!
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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
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  #19  
Old 03-21-2019, 06:57 PM
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Found out today that the filter was last changed 70k miles ago. This car sees 150 miles of Ga back roads Monday through Friday.
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  #20  
Old 03-21-2019, 08:00 PM
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Wow factory interval is 4 yr / 40 k miles.

I think that is too long and should be done every 2 yr / 20 k miles

I would replace the breather puck, it probably got shredded from the back pressure in the filters.

Don’t forget you need to do an adaptation when replacing the filters.
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #21  
Old 03-21-2019, 08:07 PM
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Quote:
Don’t forget you need to do an adaptation when replacing the filters.
Thanks for the heads up.

Oh yea, she verified that the bottom end of the engine was fine when she drove it down the interstate at 80 mph about 80 miles to get it to the shop. There was no smoke nor anything unusual going on during the ride down so that tells me the bottom end is probably fine. I'll find out tomorrow after I stick the new filters in.
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  #22  
Old 03-22-2019, 07:34 PM
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New engine air filter and pcv valve brought this one back to life but now I'm getting excessive muffler back pressure after DPF. Looks like I'll either gut the exhaust or replace it. After turbo spools up during full throttle acceleration I'm seeing 750 or so exh inlet temp to turbo and 70 psi back pressure. Heck, I could pump the tire up with that. Both numbers are way in the read on the gauge. What do y'all think? Car accelerates like it is supposed to with no ck engine light.
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  #23  
Old 03-22-2019, 08:36 PM
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Yep all that oil down the exhaust no good for the DPF. Although I bet the turbo was nicely lubricated from the inside out.

I know Roll Guy had a post a while back about Liqui moly product that cleans DPFs.

You won’t be able to gut the DPF, the computer is too smart for its own good, and it will trip a code from the delta P sensor across the DPF (for the lack of any delta P from the gutted DPF).

Edit: I didn’t read your post carefully, you said the back pressure was after the DPF.

In that case I would drop the exhaust pipe post DPF and see how your pressures and temperatures look. If things go back to normal then you have a plugged muffler which should be easy enough to replace and much less expensive than a DPF $$$$
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #24  
Old 03-22-2019, 08:44 PM
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The dealer sent me a new reman DPF and I replaced it. The one that was on there was supposedly installed in Nov and was under warranty.

Believe it or not the DPF is substantially cheaper than the exhaust/muffler system. Reman DPF from MB is ~$250. Exhaust system is four figures. I'm going to get a good look but if I don't see anymore sensors after front muffler I may just gut em.

Car ran out real well between 80 and 100 mph during testing in a controlled area.
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Last edited by engatwork; 03-22-2019 at 09:01 PM.
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  #25  
Old 03-23-2019, 11:11 AM
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Wow I had no idea. I figured those DPFs were pretty expensive due to the precious metals (like a gas car cat).

Four figure exhaust that is insane.
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #26  
Old 03-23-2019, 11:14 AM
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Quote:
Originally Posted by engatwork View Post
Unfortunately she has been taking car to dealer for all her service. I don't remember right off the top of my head but is air filter covered under A or B service?

Quote:
Originally Posted by engatwork View Post
Found out today that the filter was last changed 70k miles ago. This car sees 150 miles of Ga back roads Monday through Friday.
Always dealer maintained, ( only after the car breaks down on the side of the road. . .)
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  #27  
Old 03-23-2019, 01:00 PM
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Location: Bedfordshire UK
Posts: 531
You can run it straight pipe after the dpf and it will barely make any more noise other than a bit of a burble on tick over, turbo just soaks up all the noise on this engine.
Lots of videos on Youtube of Jeeps fitted with the om642 running straight systems which owners put on to get more sound and found there was very little to be had
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  #28  
Old 03-23-2019, 03:13 PM
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Does anyone know what pressure the "excessive back pressure after DPF" triggers at?

At 244k miles if it were mine I'd already have it straight piped. Unfortunately for the owner after the dealer told her she needed another engine she went and bought a new car.
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  #29  
Old 03-24-2019, 07:33 AM
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I'm not seeing any issues with the turbo not building boost and car will accelerate as it should.
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  #30  
Old 03-24-2019, 07:57 AM
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Quote:
Originally Posted by engatwork View Post
Does anyone know what pressure the "excessive back pressure after DPF" triggers at?

At 244k miles if it were mine I'd already have it straight piped. Unfortunately for the owner after the dealer told her she needed another engine she went and bought a new car.
I think Xentry has the acceptable range for each parameter when you are looking at ‘actual values’. Do you have a Xentry system or a 3rd party scanner?

That is completely unethical on the dealer’s part, just trying to push someone into a new car because they don’t want to mess with a diesel anymore. Just curious which city the dealer in question resides.

Do you know what her plans for this car are?

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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