OM651 Throttle Valve Problem

Doug450

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Joined
Jan 21, 2021
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10
Location
Somerset
Car
C250
Also found this in MB looking wiring... Any ideas
 

Doug450

New Member
Joined
Jan 21, 2021
Messages
10
Location
Somerset
Car
C250
GIven the codes its throwing it sounds like it might need replacing. I'm not sure about the seals etc as never done one.

hopefully somebody on here with more knowledge might be able to help?
Are there any good merc sepcialists near you?
No not really, only the dealership.. Prefer to save money
 

CarFan79

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Nov 16, 2018
Messages
155
Location
Glasgow
Car
W204 C220
unnamed~2.jpg
That's the throttle valve. The part up top with the actuator is part of the egr system.
 

Doug450

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Joined
Jan 21, 2021
Messages
10
Location
Somerset
Car
C250
Ha, I thought it was higher up so, now I can see it's going to be a ball ache! 🤣
Strange thing is I drove it earlier, with no issues, apart from the warning light, but then later drove it and it went in to limp mode... So checked it and found no active faults.. So deleted the historic faults and it was fine
 

Pilko

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Aug 11, 2019
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Uk
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W204 estate 2012
Amazing. All the faults you listed are on mine. I did bite the bullet and cleaned out the throttle body, metal egr connecting pipe an plastic to the inlet of the engine. It was completely gunked. Quite straightforward but the sixth screw under the metal agr cooler is a pig and get yourself a telescopic magnet as you will undoubtedly drop bolts. Have to be a decent socket set with plenty of extensions!!
Cleared all the faults at a local dealer.
Not a bit of difference. Still goes into limp now and again with light on and off: main problem being crankshaft position sensor now. I don't even know where this is and nothing on the net to show me.
Everything leads to stretched timing chain so be wary as this is scarily expensive to fix and common on these engines!!!
I am gonna try a new throttle body and camshaft sensor meantime. Will let you know how I get on and if it solves the problem.
 

CarFan79

Active Member
Joined
Nov 16, 2018
Messages
155
Location
Glasgow
Car
W204 C220
Amazing. All the faults you listed are on mine. I did bite the bullet and cleaned out the throttle body, metal egr connecting pipe an plastic to the inlet of the engine. It was completely gunked. Quite straightforward but the sixth screw under the metal agr cooler is a pig and get yourself a telescopic magnet as you will undoubtedly drop bolts. Have to be a decent socket set with plenty of extensions!!
Cleared all the faults at a local dealer.
Not a bit of difference. Still goes ionto limp now and again with light on and off: main problem being crankshaft position sensor now. I don't even know where this is and nothing on the net to show me.
Everything leads to stretched timing chain so be wary as this is scarily expensive to fix and common on these engines!!!
I am gonna try a new throttle body and camshaft sensor meantime. Will let you know how I get on and if it solves the problem.
The crankshaft (40) sensor is on the same side as the throttle valve, it bolts in pointing towards the flywheel. The camshaft sensor (11) is on top of the cam cover to the left.
 

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Pilko

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Uk
Car
W204 estate 2012
The crankshaft (40) sensor is on the same side as the throttle valve, it bolts in pointing towards the flywheel. The camshaft sensor (11) is on top of the cam cover to the left.
Many thanks for that. There's not much online to show you on the OM651.
I have changed the crankshaft sensor with it still reading P0340, P0344 and P0697. May be the dreaded timing chain issue after all on mine.
 

Pilko

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Aug 11, 2019
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Uk
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W204 estate 2012
I have replaced the camshaft sensor. I have to do the crankshaft sensor. The image is not the best to show where it is located and I cannot find any images online. Does anyone have any close up images or details of what needs to come off to gain access to the crankshaft sensor egr etc.
 

CarFan79

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Joined
Nov 16, 2018
Messages
155
Location
Glasgow
Car
W204 C220
Your a star thanks for that. Do you think it will be easier from above or below. When I took the throttle out, it was a beast for access.
It looks tight from the top, not like the vans. Possibly easier from below but have never done the job on a car before.
 

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