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  #1  
Old 07-02-2019, 09:12 PM
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R320 Issues

I'm having a heck of a time with my 2009 R320 with the Bluetec. It started after a fuel stop this weekend, when I was getting on the highway it went into a limp mode. I reset the codes but didn't write them down as I had my family with me.

We completed our trip in limp home mode. The car would alternate from a really loud turbo noise (like as loud as the AC fan on high) whooshing to no turbo noise at all. When I got home I pulled the codes again and had a 123900 The positive control deviation during boost pressure control is too high.

I thought I was looking for a boost leak with this so I pulled off the air charge pipe to the intercooler and found a bad o-ring. I replaced it and the turbo air inlet gasket which had also failed. I took the actuator linkage off and everything moved freely. I removed the cover of the actuator and ohm'd out all of the delicate connecting wires and all were ok. The actuator moves.

The car falls on its face at about 1200 RPM after reseting the code and goes into limp mode somewhere between 3000 and 4000 rpm. Sometimes this happens right away sometimes it doesn't. With my foot on the gas and other on the brake we can see the actuator move up and down trying to regulate the boost as the car bucks and surges.

Currently I am boosting upto about 24psi. On my scan tool I register idle at 13psi (even with the car turned off). I am also seeing similar numbers for exhaust backpressure. So I got the idea to run a DPF Regen on the car using my iCarsoft MBII. It didn't work. Now I have a 13AF00 Soot content of the Particulate Filter is too high. I did not have the error code until I ran the regen and it will not clear. The scanner lists the ash at 0g...so I don't know what's going on now.

I have tried a few other things but nothing really changes. Any help is appreciated. I need to understand what the control deviation is and why it is too high.
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  #2  
Old 07-03-2019, 06:11 AM
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Wow, thanks for the details. Usually someone posts just a code number and says " tell me how to fix my car." It's also great you carry a scanner on the road.

I don't know these cars specifically but I'd be investigating if there is an improperly operating exhaust restricter flap. Some diesels do this to reduce emissions / lower warm up time. This might explain the " 13AF00 Soot content of the Particulate Filter is too high " , the " ash at 0g " is probably a time weighted calculation as I doubt there is a scale in the DPF.

I'd also be looking for the boost pressure sensor that is giving the 13 PSI reading. Hang a volt meter on the sensor and don't just rely on the scan tool readings. Sometimes when there is a fault, the ECM will substitute a value that ends up showing on the scanner.

Have a look on the ML, GL, G-Wagen, R-Class, Unimog, Sprinter forum.
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  #3  
Old 07-03-2019, 07:08 AM
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The R320 has the same engine as the late 2000s MLs and E class (I have one of each!)

The DPF may well be clogged, and your forced regen was the last straw. The regen cycle forces the engine to run rich and dumps excess fuel down into the hot DPF, causing a process similar to what happens in a self cleaning oven.

There is a differential pressure sensor across the DPF under the vehicle that senses incoming and outgoing pressures and produces a signal to the ECU. This is what tells the ECU when to regen and when it is clogged.

There is a manifold pressure sensor downstream of the turbo but can’t remember where it is at the moment - maybe in the plastic box at the front left that joins the return from the intercooler to the two halves of the manifold.

The description of the problem ‘positive control deviation during boost pressure control too high’ means that the system is trying to command an increase in the boost pressure but it is overshooting the mark and going too high. If the turbo is actuating properly that is a good sign and I suspect the boost pressure sensor as well.

There is a Lubro Moly product meant for cleaning DPFs. Rollguy had a thread on that a while back and had good luck on an E class using it to clear out the DPF.

If you can get your hands on a Xentry computer it will help immensely. Not only will it show you the fault codes, it is hyperlinked to the repair/troubleshooting procedures.
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The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older sonís DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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  #4  
Old 07-03-2019, 10:30 AM
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Thank you for the responses. Do either of you know the values on the map/boost sensors? I'd like to eliminate those from the equasition.

Jay Bob, do you think that if the actuator is moving it is fine? I did notice when I removed the cover that there was a tad bit of play in the worm gear. Could it be possible that the overshooting is caused by the slop which is causing it to overshoot?
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  #5  
Old 07-04-2019, 01:34 PM
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Ok I think I may have found the culprit....completely blocked air filters. I figured I'd pull the boxes (what a pita) and check them and they are plugged solid. I did a very short test drive with no boxes and the car pulled hard to redline with no new alarms.
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  #6  
Old 07-04-2019, 04:50 PM
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My last post didn't work for some reason, but basically I pulled the airboxes off the R320 and the car ran perfect. I found that the air filters were plugged solid.

So I drove to the closest place to get an air filter for this pos (25 miles one way) got back wrestled the absolutely stupid air boxes back into the car and.....back to the same 123900 code. Thought perhaps it was something to do with running it with the map sensor outside of the air box so I removed it and tried again, same thing.

Earlier with the passenger airbox off it went into alarm straight away. When I pulled the drivers airbox I was able to push it hard multiple times without issues all the way to redline for about a mile w/o alarm. I'm starting to think there may be an issue with the MAF sensors or there's some type of massive blockage in the air duct on the drivers side?
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  #7  
Old 07-04-2019, 05:14 PM
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Not sure why this forum is not letting me post, but in the event that this finally makes its way to anyone's eyes; I removed both air boxes again and can't make it out of the driveway without it going into alarm.

Is there any possibility that bad fuel could cause a 123900? Symptoms started about 1-2 miles after a fill up.
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  #8  
Old 07-04-2019, 07:14 PM
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There is a forum rule that if you are a newbie then a moderator has to approve your first 5 posts. Just to keep the spammers out.

But yeah there is a strong correlation between your fueling and the trouble starting. I had a situation where the station near my house had the delivery driver stick the gas hose into the diesel underground tank filler. I got a fill of 1/2 gas 1/2 diesel and my OM642 hated it. Went to the dealer and they purged my fuel system.

Fuel station corporate agreed to pay for the repairs but then their liability carrier got involved and refused the claim. So as a result I refuse to ever trade at this particular oil company again. Let's just say they got their start in a big city in Dallas selling ice between two certain hours.
__________________
The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older sonís DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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  #9  
Old 07-04-2019, 08:18 PM
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Posts: 7
I pulled the generic code and it is a P0299 which indicates an underboost. So I went back and looked for a leak again, pulled the silencer off and blew into it (no leaks) pulled the intercooler outlet hose off and no visible cracks.*



The Turbo is way louder than normal when building boost sounds like a fan under the hood, I can find no leaks (even hit all the charge piping with soapy water). I assumed that it was loud due to the actuator opening the wastegate while attempting to regulate the boost. There's no noise at idle or without a load on the engine. I did find an extremely small air leak around the intake manifold, the water bubbled but did not change bubble rate*when boost was built.*



At this point I can only figure out that either: 1) I have a leak that I can't find, possibly the passenger's intake or somewhere on the turbo itself (there is no play or drag*on*the turbo), 2) The actuator isn't functioning correctly it's going full open on the wastegate or perhaps it just isn't regulating correctly, 3) One of the MAF or MAP sensors is bad and throwing the readings off so the turbo actuator is going crazy trying to compensate.*
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  #10  
Old 07-04-2019, 08:29 PM
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Quote:
Originally Posted by jay_bob View Post
There is a forum rule that if you are a newbie then a moderator has to approve your first 5 posts. Just to keep the spammers out.

But yeah there is a strong correlation between your fueling and the trouble starting. I had a situation where the station near my house had the delivery driver stick the gas hose into the diesel underground tank filler. I got a fill of 1/2 gas 1/2 diesel and my OM642 hated it. Went to the dealer and they purged my fuel system.

Fuel station corporate agreed to pay for the repairs but then their liability carrier got involved and refused the claim. So as a result I refuse to ever trade at this particular oil company again. Let's just say they got their start in a big city in Dallas selling ice between two certain hours.
I have driven the vehicle approx. 170miles in limp home mode so hopefully it is not gas in the diesel...yikes. How did you figure out that gas was in the diesel?
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  #11  
Old 07-04-2019, 08:55 PM
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I actually had fueled the ML320, the E300, and the 300TD all on the same day. They all started running weird. The IDIs hated it more than the CDI engine. The IDIs would not restart when hot. Pulled off the fuel cap and got a big whiff of gasoline.
__________________
The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older sonís DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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  #12  
Old 07-05-2019, 07:05 AM
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Posts: 7,154
Quote:
Originally Posted by happyinwi View Post
How did you figure out that gas was in the diesel?
Another test is putting the liquid in a styrofoam cup. A gas mix will dissolve the cup pretty rapidly where straight diesel won't.

I did this when the guys at old work put diesel in a gas man lift. ( The rental co told the guys it was a diesel lift. )
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  #13  
Old 07-06-2019, 12:14 AM
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First if it started very shortly after a refueling. Get the fuel removed and replaced. It may not be bad but you cannot chance it.

Describe the type of place you fueled at. Some places are still supplied by contracted bulk carriers. They might not bother to clean out a previous load of whatever they had on board before filling with diesel.

It is not always gas contamination you are dealing with. One of the primary reasons I do not want the most modern diesels. A load of bad fuel can cost you a bundle to address. I am driving a less sophisticated non Mercedes diesel right now. Large truck stops represent the safest filling places. I also use a higher volume local place. I know they are serviced by dedicated tankers. I still got a lot of water one time in the middle of winter there.
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