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#4532112 - 10/02/17 02:57 PM Long shot - need help with Mercedes
DriveHard Offline


Registered: 11/24/03
Posts: 1063
Loc: Middle of Iowa
I have had this posted to two different Mercedes forums for several days now with ZERO response. Just going to post it on here in a long shot someone on board could help me out.

I have a 2013 ML350 with the 3.5L direct injected M276 engine with ~67,000 miles.

This is my wife's daily.

Here are my symptoms...

Round 1:
I started getting long crank times to start the car. It would always start, but just took much longer than normal. Ran well...but mileage started degrading.

My wife was on her way home from work and car started misfiring badly. No power, engine light on. She was only 2 miles from home so I asked her to limp it home on the shoulder.

Pull the codes...lots of misfires, on multiple cylinders. Cylinder 2 and 4 stood out. Also had code P008992 "The pressure regulating valve has a malfunction. The function or the instruction is faulty"

Replaced all 6 plugs and coils. Plug on cylinder 2 was totally black. Plug on cylinder 4 was about half as black as cylinder 2, but not normal. The remaining 4 plugs looked fine.

Car ran great, I took her out for a good old Italian tune up...purring like a kitten.

Wife and I took the car out yesterday...started having extended cranks again. This is less than 50 miles after the plugs/coils. I also was watching the fuel economy, and it seemed much worse than normal.

Wife took the car out this morning...had the same problem. Strong mis-fires, but she was in town and limped home. I went out to pull codes this afternoon...

Misfires on 4, 5, 6...and P008992 "The pressure regulating valve has a malfunction. The function or the instruction is faulty"

I clear codes and start it up and she purrs like a kitten again. Odd.

Ok...still a newb to MB, but not to cars or engines. I am guessing this is a pressure regulating valve that is controlling cam phase? Can anybody help? A google search for the code turns up almost nothing...

Please help me get my bride back behind the wheel of her Benz before she wants her Beemer back.

Thank you!!!!!!!!!
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#4532122 - 10/02/17 03:27 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
nthach Offline


Registered: 01/02/04
Posts: 3892
Loc: California
There may be some MB-specific codes your OBD-II scanner isn't picking up - most scanners can pick up on the OEM-specific codes but not all and I don't think there's a federal regulation that dictates an aftermarket scanner needs to pickup anything that isn't a P0xxx code. This might be the time to take the car into an indie Mercedes tech, but since fuel systems are covered under emission systems warranty, I'd go to the dealer. I'm not sure how generous the federal warranty is.

GDI systems do work similarly to a common rail diesel system, high-pressure fuel pump driven off a cam and high-pressure sensors. My suspicions is a "fluttery" high-pressure pump not working at proper PSI to feed the injectors, wiring issue or the sensor. I'd look for an OEM-specific code before going further.

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#4532123 - 10/02/17 03:28 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
FowVay Offline


Registered: 06/02/02
Posts: 2679
Loc: Southeastern USA
Have you checked the fuel rail and fuel pressure regulator? It sounds like you're misfueling for some reason. Replacing the plugs helped with the symptom but didn't cure the cough.

That particular DTC doesn't appear to be a valid DTC either.

P0089/P0092 seem more plausible. Check the fuel filter, fuel pump, or pressure regulator.

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#4532125 - 10/02/17 03:30 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
knerml Offline


Registered: 04/05/05
Posts: 479
Loc: NE Ohio
Check battery voltage.

It might be low enough that a sensor is giving false data.

Had similar problem with my Kia. Charged battery and everything is fine.
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#4532126 - 10/02/17 03:31 PM Re: Long shot - need help with Mercedes [Re: nthach]
DriveHard Offline


Registered: 11/24/03
Posts: 1063
Loc: Middle of Iowa
Originally Posted By: nthach
There may be some MB-specific codes your OBD-II scanner isn't picking up - most scanners can pick up on the OEM-specific codes but not all and I don't think there's a federal regulation that dictates an aftermarket scanner needs to pickup anything that isn't a P0xxx code. This might be the time to take the car into an indie Mercedes tech, but since fuel systems are covered under emission systems warranty, I'd go to the dealer. I'm not sure how generous the federal warranty is.

GDI systems do work similarly to a common rail diesel system, high-pressure fuel pump driven off a cam and high-pressure sensors. My suspicions is a "fluttery" high-pressure pump not working at proper PSI to feed the injectors, wiring issue or the sensor. I'd look for an OEM-specific code before going further.


This is a Mercedes Benz specific code reader...there are no additional codes.

The code P008992 appears to be a MB specific code of which I can't find a single detail on.
The other 4 codes were the misfire on 4, 5, 6, and a code for general misfire.

If it were fuel pressure...wouldn't it effect both banks?




Edited by DriveHard (10/02/17 03:31 PM)
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#4532127 - 10/02/17 03:32 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
It's not manufacturer-specific, it's "P0089-92" and it's talking about the fuel pressure regulator. I can't even get a diagnostic flowchart from Mitchell, so you're gonna have to break out all the traditional fuel system testing tools plus the best scantool you can get your hands on.

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#4532128 - 10/02/17 03:41 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
meep Offline


Registered: 02/20/07
Posts: 3551
Loc: Southeast
this reeks of a fuel pressure issue. not all systems monitor it. volvos do - it's electronically regulated - but in many designs it's a mechanical regulator either in the pump side, or in the return side if it's a circulating system.

based on pretty much no data, it actually sounds like it's running lean to me.

in volvos, the electronic fuel rail pressure sensor is well-known to fail.

-m
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#4532131 - 10/02/17 03:49 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
The long cranks suggest a faulty high pressure fuel pump or leaking injectors.


Edited by mightymousetech (10/02/17 03:53 PM)
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#4532142 - 10/02/17 04:07 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
JHZR2 Offline



Registered: 12/14/02
Posts: 41768
Loc: New Jersey
Im sorry, what part of pressure regulating valve would make you change plugs and coils?

It just doenst make sense to me personally... Id be looking at a DI fuel pump or something with variable valve timing.

Do you have access to MB specific codes on that scanner?

Have you asked at PeachParts?

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#4532188 - 10/02/17 04:52 PM Re: Long shot - need help with Mercedes [Re: knerml]
Dadillac Offline


Registered: 07/31/11
Posts: 62
Loc: Woodbridge, NJ
Originally Posted By: knerml
Check battery voltage.

It might be low enough that a sensor is giving false data.

Had similar problem with my Kia. Charged battery and everything is fine.


This is where I would start. Having owned 2 Cadillacs and having 2 Lincolns in the family has taught me how vital battery voltage is to luxury vehicles. My experience is many hundreds of dollars, many many hours, only to be a failing battery. YMMV

Don

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#4532209 - 10/02/17 05:24 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
Astro14 Offline


Registered: 10/10/10
Posts: 8533
Loc: Virginia Beach
Has the battery been run down to flat? The AGM in your MB won't recover from that and will need to be replaced.

Low battery voltage causes all sorts of issues.
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#4532213 - 10/02/17 05:28 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
Audios Offline


Registered: 11/19/11
Posts: 884
Loc: Lyndhurst NJ
It seems alot like an internal fault in one of the high pressure pumps. THeres usually one pump per bank, so it can affect just one bank.Its allowing pressure to bleed down while in operation, so the car isnt seeing the 3k psi it needs for correct injection. Youll probably need a high pressure pump to start, hopefully theres no cam wear issues like on the earlier Audis.
Also, go in with a generic tool or switch to OBD2 to see if you can get the fuel pressure codes as a more normal P fault. My Autel can switch to generic, sometimes this helps.


Edited by Audios (10/02/17 05:42 PM)
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#4532231 - 10/02/17 06:01 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
Astro14 Offline


Registered: 10/10/10
Posts: 8533
Loc: Virginia Beach
Further, your icarsoft is good, but falls well short of Mercedes OE diagnostic equipment, known as STAR (DAS, XENTRY, etc.).

If you really want to know what's going on with your MB, get someone with STAR, hook it up and have them read ALL THE CODES, including all the codes missed by icarsoft. Each code in STAR will have troubleshooting steps, that you, or your garage with STAR, should follow. STAR includes the ability to energize circuits and devices, like pressure pumps, as part of the troubleshooting.

When you see STAR in action, you'll know what I mean. I've got a EBay copy, from China, running on a Dell D630, through a multiplexer, and it includes everything, including all of the workshop and service information. For example, I can run the secondary coolant pump (intercooler system) from my laptop, and I can move windows and seats, to check door and seat modules. I can articulate and calibrate the suspension. The list of STAR functionality is practically endless.

In the meantime, if your battery isn't strong, then you'll get all sorts of weird malfunctions, so do check that first.


Edited by Astro14 (10/02/17 06:03 PM)
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#4532310 - 10/02/17 07:19 PM Re: Long shot - need help with Mercedes [Re: DriveHard]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
People... it's a regular OBDII code with a sub-code. And when the battery dies on a car like this, it generally sets dozens of codes. Smh...

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#4532331 - 10/02/17 07:34 PM Re: Long shot - need help with Mercedes [Re: Ethan1]
Astro14 Offline


Registered: 10/10/10
Posts: 8533
Loc: Virginia Beach
Originally Posted By: Ethan1
People... it's a regular OBDII code with a sub-code. And when the battery dies on a car like this, it generally sets dozens of codes. Smh...


Regular OBD-II codes are worthless in this case.
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