MiduMoh

hello everyone! i would like to state that this is my 1st visit/post in this magnificent website so i'm doing anything wrong please be glad to state it

so i had this problem like since like 6 months (when my baby reached 140000 km...i know its a lot )
i always hear a rattling noise on morning startup for 4-9 seconds and it just dissapears
i would like to mention that something terrible happened to the injectors at 60000 km and got replaced by brand new 2013 model ones (w212) and damn they were expensive
this question migh've been answered somewhere but i feel like my case is a bit different so....an answer would be really appreciated
Note:when i leave it on 2nd key position (before start-up) for like 5-10 seconds it doesn't do that noise so...i'm concerned that the injectors might've been misplaced the whole time

mitaka

Sound like a well known issue with the V6 engines. It is a timing chain slapping at start up.

MiduMoh

only my E250 is not a V6 but curiuous enough to take a look at it,thank you!

i also forgot to mention when i was tailgating it with my dad's car i noticed that when he puts down the throttle it just throws a lot of black smoke from the exhaust (a bit noticable)

is it related to the injectors? a mechanic said that judging from it's milage it's very normal but i'm concerned

CEB

Most of the members here are from the US so for us to help you, you'll have to give us more information about your car such as the engine and transmission.

MiduMoh

of course! with pleasure!

it's a 2010 E250 CDi W212 Automatic

CEB

So it is a diesel similar to the new E250 being sold in the US since last year.

Sorry. I can't help further. Hopefully one of our European members can chime in.

MiduMoh

Darn it! i thought the Euro and US version have the same engine layout...
oh well...a quick timing chain check doesn't hurt right?

CEB

The 250 diesel in the US is brand new for 2014 and is quite a bit different from the Euro version. Emission and other regulatory requirements make the engine produce less HP (195 - down from 204) and I doubt that anyone has nearly the miles you have. The older diesel in the US was the 350 which - being a V6 - is a completely different engine.

As far as I know, the timing chain noise applies to gas engines. Additionally, the timing chain would make noise regardless of how long you leave the car in the accessory position.

I think you need to look for an ignition (i.e. glow plug) issue that is the root cause - even if it a timing belt/chain noise.

MiduMoh

that explains the common "common-rail" issues and not having it in the E350

had the same issue in my Pre-owned 2004 VW Touareg that showed that the injectors were ruined by contaminated Diesel (water yes)

had my doubts previously but i just checked the E250 fuel filtre and yes it 's filled with "water"...did the injectors went rusty again? i hate to spend another 180000 DZA (almost 1700 euros) on a new set ;(

thanks for the info BTW

dminahan

I had a timing chain noise on my 2011 ML350 bluetec (diesel) where it would make a noise on start up usually on a cold start of the day. So it does happen on the diesels. Not saying that is your issue.

They had to replace a chain tensioner or gear I believe. They kept saying the timing chain stretched and when I asked they finally responded around a gear failure.

Just figured I'd let you know it could be that as well.

DerekACS

The OM 651 4 cylinder diesel was introduced in Europe in October 2008. It is produced in about 11 different versions for world-wide use.

The North American version was first introduced in the 2013 GLK250, followed a year later in the 2014 E250BT. The differences between the Euro E250BT and North American version are less than you might imagine. The latter uses Bosch injectors to cope with North America's lower quality diesel fuel and a differently programmed ECM, while the Euro versions had problematic Delphi injectors.

However, all versions (except front wheel drive sideways engine configuration) suffer from one potential headache and that is the rear mounted timing gear. This arrangement was required to meet Euro pedestrian safety standards, to keep a lower engine profile at the front of the engine bay. If any timing chain issues arise with the OM 651, the engine must be removed from the car for adjustments and/or repairs.

CEB

Good to know. Thanks!

MiduMoh

is there any possible way to make this even wores? just kidding

anyways...i think it's not the timing chain,it's my fuel pump.

reason to put it in suspicios is that it makes a bit of noise in the back,noticed it when i started it and did a quick check to rear passanger-side tire.

she might not give a good compression,also if i left the key on the 2nd ignition position (before start) for 30 seconds and started it...THE NOISE IS GONE!
my guess is that since the fuel pump is worn-out the diesel might not reach the injectors properly so...i'll remove it and have a look

ImInPA

Black Smoke from a diesel is a good thing. No worries there. The rattling you hear at startup could be just normal valvetrain noises. I am thinking more like something the hydraulic lifters taking a bit longer to charge with oil. That would certainly explain why it does not happen if you wait a few seconds, as it give the oil pump a chance to get the oil moving. Before "fixing" anything, I would try a heavier weight oil and see if that reduces the noises you hear.

MiduMoh

it's a bit noticable compared to other E250s i've seen on the street...you can't see it on idle or stationary high revs but on hard accelerations on the highway you can notice it

isn't it belt-operated? i mean the oil pump if it's electric then i guess i should try probably after a month because yesterday i changed the oil...i'm a bit worried about the injectors due to the fact they're Delphi and DerekACS stated they're not suitable for low-quality Diesel

MiduMoh

It took me a VERY long time to find the issue : it's the injectors and reservoir pump.