E300 diesel w210 edc light knocking noise issues

[faz2704]

Hello people,

I recently bought a lovely almost rust free 210 e300 diesel with only 94,000 miles by only 1 registered keeper. I usually work with old Japanese 4x4s and don't have too much experience with Merc diesels.

It has no apparent starting problem and starts without drama hot or cold.

Problems / symptoms:
1) the EDC light comes on every time I start it (clears with R button)
2) ONLY on cold start there is blue smoke from the exhaust for a few seconds which clears within 10 seconds at idle.
3) there is a knock / rattle from the top of the engine - most prominent at cold start and between 1000-1500 rpm.
4) 2 vacuum pipes are not connected to anything (from the accelerator thing on the passenger front wing)
5) Driving down the motorway the day I bought it I floored it to see what it does, around 2500 rpm I noticed it was jerking as if about to run out of diesel and there were puffs of blue smoke in the rear view mirror, drove it for 60 miles and this happened about 4/5 times, each time I felt loss of power with the jerking, I realised if I accelerate harder it would clear itself before repeating a few miles down the road. It would happily drive at 70mph (90mph on a private stretch) until the jerking episode again)
6) Blue smoke from PCV pipes (I think it is overdue an oil change..maybe?)

What have I done so far?
I have changed both fuel filters (filled with diesel treatment) new air filter, cleaned EGR and intake (not much gunk as this is a none turbo) I also added a valve / lifter cleaner into the oil (not changed oil yet).

I would be grateful if anyone can help address any of these problems as I want to sort it out and keep it for a while.

VIDEOS of this car and above mentioned issues:
1) The day I cleaned out the egr and intake, no intake pipe or egr valve in this video.

[YOUTUBE]EbYr1iIE5o4[/YOUTUBE]

2) All back together and after 65 miles with valve/tappet cleaner in the engine oi.

[YOUTUBE]w7GC-cn5suI[/YOUTUBE]

 

[faz2704]

VIDEO 1) Mercedes w210 e300 diesel om 606 edc light crank case ventilation smoke and engine sound.mp4 - YouTube

VIDEO2) Mercedes w210 e300 diesel engine sound injector - YouTube

 

[Dieselman]

Fuel starvation caused by air leaking into the clear pipe seals, or pump rack sensor not reporting correctly.

 

[faz2704]

Fuel starvation caused by air leaking into the clear pipe seals, or pump rack sensor not reporting correctly.

Which one of these would cause the EDC light to come on?

Do the injectors sound OK to you?

Thanks

 

[Dieselman]

The rack position sensor definitely will.

 

[faz2704]

How can I test that?

Another thing I noticed is that after I switch of the engine there is a lazy solenoid type knock from around the IP, as if a diesel cut off solenoid is getting lazy.

Do these have the old shut off solenoids on the pump?

 

[faz2704]

The rack position sensor definitely will.

Is the crank case smoke cause / pressure something to worry about?

 

[faz2704]

Fuel starvation caused by air leaking into the clear pipe seals, or pump rack sensor not reporting correctly.

I cannot see any air bubbles in the clear pipes.

 

[Dieselman]

How can I test that?

Another thing I noticed is that after I switch of the engine there is a lazy solenoid type knock from around the IP, as if a diesel cut off solenoid is getting lazy.

Do these have the old shut off solenoids on the pump?

The stop solenoid is mounted on the side of the pump, but you may also be hearing the rack linear solenoid returning to rest position.

 

[faz2704]

would running it on biodiesel help clear the fuel system and injectors?

 

[bolide]

would running it on biodiesel help clear the fuel system and injectors?

It'll certainly help confuse things

Standard 606 failings are:

* valve seat recession on the back two cylinders causing loss of compression, an engine that feels as flat as a pancake and breathing from the oil filler
* air leaks into the fuel system causing starting problems
* noisy serpentine belt tensioner top bushes
* knackered engine mounts

That sounds like a 200,000 mile engine

Nick Froome

 

[faz2704]

It'll certainly help confuse things

Standard 606 failings are:

* valve seat recession on the back two cylinders causing loss of compression, an engine that feels as flat as a pancake and breathing from the oil filler
* air leaks into the fuel system causing starting problems
* noisy serpentine belt tensioner top bushes
* knackered engine mounts

That sounds like a 200,000 mile engine

Nick Froome

It doesn't have a problem starting, fires up right away as shown in 2nd video.

One owner car from new with MOT records to back up the mileage plus the interior condition speaks for it self. I have no reason to believe its done any more miles than it has on the clock.

The tensioners are fine no knocking from them.

Valves ... don't know. Will run it while and see what happens.

 

[Dieselman]

That engine sounds fine, but does smoke a little and cackle on light load. I suspect a dribbling injector for both issues.

Have you tried connecting the vac pipes and see what happens, I think they are the gearbox control ones for smooth gear changes.

Are both EGR valves working properly as they are monitored and the EDC could be that.

 

[faz2704]

I only noticed 1 EGR valve (exhaust manifold to inlet pipe) and I don't think it is monitored as there electric cable connected to it.

My guess is that it is the injectors, holding a pipe on each injector and listening with my ear on the pipe I noticed the 4th and 5th injectors had a metalic sort of clatter to them.

Will try a good injector cleaner and a long run at higher revs, if that doesn't work then out they come for a full checkup.

 

[Dieselman]

The injectors won't bring on the EDC light and they do tinkle a bit anyway if the delivery valves are operating correctly.

The EGR valve and intake throttle should work in unison. Any monitoring on the throttle flap?

 

[faz2704]

No electrics on egr or intake butterfly (I removed this butterfly anyway to allow for unrestricted air flow having blocked off the egr pipe with a coin - will permanently block it with a metal plate cut to shape at the mating point) there are a couple of valves with electric and another butterfly on the underside of the banana shaped inlet manifold.