Engine runs uneven cold, C220 CDI, W204

Nelu

New Member
Joined
Apr 16, 2012
Messages
4
Reaction score
0
Location
Romania
Your Mercedes
C220CDI/2007/OM611 170HP
Hi every body,:D

(Excused my English)

I’m new in MB world, I sold my BMW 320d, and I bought an S/H Mercedes Benz (80K Miles - 127K Km from 2007) a C220 CDI 170HP (W204) :p– characteristics see Carfolio.

I bought the car with a “little engine problem”: when the engine is cold, in “drive” it runs uneven, symptoms like a cylinder has a misfire and the car shakes. When the car is warm (180 F aprox. 80 deg. C) it runs fine, it accelerates smooth and everything is OK.

I thought it is simple to fix it;), to clean the air intake, EGR, inlet manifold, check the swirl flaps and moving mechanism, max. an injector problem, like at my last BMW etc…, etc…

Yesterday, at a busy traffic light, the CDI engine quit in drive….:confused: and I create traffic problem….:shock: I must restart the engine….:Oops:

For me it seems to be more difficult to solve the problem at my MB:rolleyes:, and …costly.
I visit an MB dealer to investigate and after a test computer, they told me to change the commonrail pressure transducer. All the injectors are OK. I think is not a big problem but the pressure transducer is sold together with all the commonrail tube (!) and it cost about £660! (800Euro) :evil:.

I’ve cleaned all the electrical connectors… I remove the EGR (electrically operated not vaccum like at BMW), I find the EGR in good condition, no soot build-up as I thought, (I think that also the inlet manifold must be is in good condition!).
I cleaned only the EGR perfectly. See pict.

After that, I test the car on the motorway, to clean all the exhaust, the turbine, the cataliser…. After “the motorway session”, the engine run smooth and the MPG improves from 41 to 47 on motorway. I restarted the engine in the morning, when it is cold and it runs OK, but the second day the problems appear again.

I asked some advice: You hear about a problem like that?
 

Attachments

  • 160420128140Small.jpg
    160420128140Small.jpg
    89.9 KB · Views: 620

rolfy

Senior Member
Joined
Jun 24, 2010
Messages
101
Reaction score
0
Location
Nottingham UK
Your Mercedes
W203 C180 Kompressor Coupe (57 reg)
Sounds to me a bit like a recent problem I had with my W203 220 CDI.

I had many of the same symptoms as you, most of which disappeared once the car was warm. My Indy didn't pick up any engine faults on first examination and I tried all sorts of solutions/ideas, most of them to do with the transmission.

It turned out to be a worn injector causing a misfire at low fuel loads. Try leaving the car at the garage overnight so your mechanic can experience the cold running problems for himself.
 
OP
N

Nelu

New Member
Joined
Apr 16, 2012
Messages
4
Reaction score
0
Location
Romania
Your Mercedes
C220CDI/2007/OM611 170HP
  • Thread Starter
  • Thread starter
  • #3
Rolfy thanks for your advice!

But I ordered yesterday the fuel distributor P/N A 646 070 03 95, as the Mercedes dealer recommend me after the test computer. In a week I will see if their diagnoses was OK, if not I will have a NEW fuel distributor (common rail tube with the two pressure sensors at the ends of the tube).
It's difficult to maintain at traffic light the car in drive (D) when the temperature is between 50 to 70 deg. C. Today I see that the misfire is maximum at 60 deg. C, in (D) when I stopped at traffic light, the RPM drop then rise and sometimes the engine tends to stop, so I try to put the gear lever in (N) and slightly accelerate the engine at 1000 RPM, then put the gear selector in (D) to start the car. This abnormal procedure in time is distructive for the automatic gearbox.
When the engine is near started and cold, it runs near OK. Probably at low temperature the computer send the information to add a little rise in the pressure injection to maintain the idle speed. Also the engine run smooth when the temp. is stabilized at 85 - 90 dec. C.
So I decide to make an expensive experience, the only alternative that left me.
 
OP
N

Nelu

New Member
Joined
Apr 16, 2012
Messages
4
Reaction score
0
Location
Romania
Your Mercedes
C220CDI/2007/OM611 170HP
  • Thread Starter
  • Thread starter
  • #4
Today the engine problem of my W204 C 220 CDI was solved:lol:

As I mentioned, I ordered the fuel distributor P/N A 646 070 03 95, as the Mercedes dealer recommend me after the test computer. They mounted the new common rail tube with the two pressure sensors at the ends of the tube and after that the engine management was resofted.
At my first run I feel a new engine, it run smooth without any misfire. I go in a test run and I feel like a new car, a real Mercedes!
The MPG was improved, at 70-80 Km/h (43-50 miles/h)with a warm engine and stabilised speed I obtained an astonishing fuel consumption of 4,7 l/100Km (58,81 MPG):p (old fuel consumption in the same conditions was 5,5 l/100Km or 47 MPG)
All the operation, parts and manpower costed me 3800lei (710GBP) and the problem was solved!:D
 
OP
N

Nelu

New Member
Joined
Apr 16, 2012
Messages
4
Reaction score
0
Location
Romania
Your Mercedes
C220CDI/2007/OM611 170HP
  • Thread Starter
  • Thread starter
  • #5
Picture of the faulty rail injector

Picture of the faulty rail injector.
 

Attachments

  • 25042012299 small.jpg
    25042012299 small.jpg
    251.1 KB · Views: 1,521

Umarnewcastle

Senior Member
Joined
Mar 10, 2014
Messages
98
Reaction score
1
Location
Newcastle
Your Mercedes
C220cdi 2002
i have same issue with common rail once temp 80 to 90 car will not start

but when cold no issue
 


AMF Automotive - We are an independent Mercedes-Benz and AMG specialist located in Paddock Wood, Kent, with full Mercedes Diagnostic equipment. We offer a full portfolio of tuning options for AMGs and can cater for all your Mercedes needs.
Tel: 0203 384 4644www.amfmercedes.com/
Top Bottom