2015 e220 bluetec idle issue

[Willsmith]

Hi everyone, hope you guys are good. Can someone please help me with an idling problem my car has. So basically i dont have any engine lights on or any fault codes my car has the om651 engine and once moving the car drives pulls and drives nice without any issues. The problem i have is that when my engine is fully warmed up to 90 degrees when i stop and put it in neutral i can feel the engine in the seat the revs dont fluctuate however if i increase the revs by 100rpm its smooth.The engine and gearbox mounts have been done and i only have 40,000 miles. The car only seems to do it when its fully upto temp. It will not do it whilst warming up, only when fully warmed up i just cant figure out what it could be as there are no fault codes. Can anyone help please

Thank you in advance

 

[bembo449]

does this unit have the inlet port shut off motor I wonder ??

 

[Willsmith]

does this unit have the inlet port shut off motor I wonder ??

Hi thanks for your reply. Im not sure to be honest.

 

[CowleyStJames]

Put some injector cleaner thru and use good quality fuels like Shell Ultimate. See if that helps.

 

[Willsmith]

Put some injector cleaner thru and use good quality fuels like Shell Ultimate. See if that helps.

Thanks i have actually put through bg245 and archoil as well and its made no difference ive also changed the filters (genuine).

 

[bembo449]

we're the new mounts quality items aswell ??

 

[Willsmith]

we're the new mounts quality items aswell ??

Yep genuine mercedes. Also the thought had crossed my mind about the new mounts being faulty but the problem is too specific when it happens. From cold the car is perfect. The seat vibration only occurs at full operating temperature and not in D or R. Very obvious in neutral. and will smooth out if i press the accelerator to raise the idle by 100rpm

 

[malcolm E53 AMG]

Could be injector wear or fouling, if it’s a real issue to you have the injectors pulled by a diesel specialist and the spray pattern checked. Alternately it could be low grade fuel do you use supermarket supplied fuel if so change to premium brands you’ll need to run a few fills though it to notice a difference.

 

[Willsmith]

Could be injector wear or fouling, if it’s a real issue to you have the injectors pulled by a diesel specialist and the spray pattern checked. Alternately it could be low grade fuel do you use supermarket supplied fuel if so change to premium brands you’ll need to run a few fills though it to notice a difference.

Hi i had a live data done and all came back within spec inc all injectors were measured and within the parameters on star. Also i only ever use Bp fuel and never used anything else. The only strange part is the revs dont bounce around but the way to describe the sensation is prob what you would imagine rapid misfire on a petrol engine. U can feel this in the seats centre console, floor and drivers door.

 

[malcolm E53 AMG]

The only issue I’ve had like that was injector wear on my 6 cylinder OM613 and a spray test revealed 3 of the injectors had worn tips affecting the spray pattern (in fact the fuel dripped as opposed to producing an atomised spray) this was at 60k miles and an injector refurb sorted the problem. Symptoms were exactly as yours poor idle at tickover when hot and as soon as the revs were lifted from 600 to 800rpm it disappeared overall performance wasn’t affected

 

[Willsmith]

The only issue I’ve had like that was injector wear on my 6 cylinder OM613 and a spray test revealed 3 of the injectors had worn tips affecting the spray pattern (in fact the fuel dripped as opposed to producing an atomised spray) this was at 60k miles and an injector refurb sorted the problem. Symptoms were exactly as yours poor idle at tickover when hot and as soon as the revs were lifted from 600 to 800rpm it disappeared overall performance wasn’t affected

Hi Malcolm thanks for replying why do you think it only happens when the car is up to temp? I mean what changes? Im asking because the car pulls like a train and does not suffer from starting issues it starts on the button everytime. Also why are there no error codes?

 

[CowleyStJames]

Could also be a glow plug issue.
These engines use the Glow plugs at all stages off and on until engine is up to temp.
Would've thought an error code would be there though.
Still betting on injector problem though which could be masked when engine cold due to more fuel being pumped into injectors.

 

[malcolm E53 AMG]

Hi Malcolm thanks for replying why do you think it only happens when the car is up to temp? I mean what changes? Im asking because the car pulls like a train and does not suffer from starting issues it starts on the button everytime. Also why are there no error codes?

As above the fuelling requirements change to a leaner mixture and if the fuel isn’t being atomised properly especially at tickover the cylinder will misfire. I don’t see how STAR can detect this as the all parameters will be met on fuel pressure and injector values other than spray pattern - but I would obviously expect STAR to pick-up the uneven running

 

[Willsmith]

As above the fuelling requirements change to a leaner mixture and if the fuel isn’t being atomised properly especially at tickover the cylinder will misfire. I don’t see how STAR can detect this as the all parameters will be met on fuel pressure and injector values other than spray pattern - but I would obviously expect STAR to pick-up the uneven running

In my case it seems that star is not flagging up the uneven running to be fair if you were to look at and place your hand on the engine there seems to be nothing to suggest a problem. It only seems to be felt in the cabin. Should i continue to use a decent fuel additive? or is there an easy way without physically removing the injector to say yes its your injector(s) that are cooked

 

[CowleyStJames]

My icarsoft mb2 picks up cylinder rpm imbalance, which I would expect it to see.
So I would certainly expect Star, Autel, and other good diagnostic kit to also see.

 

[CowleyStJames]

In my case it seems that star is not flagging up the uneven running to be fair if you were to look at and place your hand on the engine there seems to be nothing to suggest a problem. It only seems to be felt in the cabin. Should i continue to use a decent fuel additive? or is there an easy way without physically removing the injector to say yes its your injector(s) that are cooked

Only way to physically check injectors is on a calibration bench.
This'll measure the spray pattern and flow rate per injector

 

[malcolm E53 AMG]

Only way to physically check injectors is on a calibration bench.
This'll measure the spray pattern and flow rate per injector

It might be the only way to get to the bottom of it one way or another - alternately wait to see if it gets worse or is just a characteristic of your particular engine - personally I’d wait and see unless the annoyance factor rules that out

 

[Willsmith]

It might be the only way to get to the bottom of it one way or another - alternately wait to see if it gets worse or is just a characteristic of your particular engine - personally I’d wait and see unless the annoyance factor rules that out

It is very annoying and to be honest it has been doing it a while now. I have spent money on trying to fix it but i cant keep replacing parts. I need someone to give me a def solution but the local garages it seems dont have a clue.

 

[malcolm E53 AMG]

I can’t see a garage wanting to spend much time on it other than hold their hand out for a diagnostic session even lifting the injectors might not find anything definitive/conclusive. It could be a bad bearing somewhere in the drive train causing a slight vibration the list is endless.

 

[Willsmith]

I can’t see a garage wanting to spend much time on it other than hold their hand out for a diagnostic session even lifting the injectors might not find anything definitive/conclusive. It could be a bad bearing somewhere in the drive train causing a slight vibration the list is endless.

Yeah this is the problem. Just wondering as a last resort it would be worth taking it in to mercedes stealership to see if they can get to the bottom of it.