Technical guys,please help,missing and smoking w210 320 cdi

[kebo57]

doesnt look too much of a bad job?

Hi don't really know on a 320 if its a 5 cylinder engine then it must be similar to a 270 engine that took me about 5 hrs inc de gunging everthing head ports, manifold flaps, manifold its self, egr & rubber hose got a few pic etc

edit think its a straight 6 so the above isn't much use

Kevin

 

[shaun 320cdi]

Ok,heres latest update!!,had my merc man around today.had an egr fault stored.so cleared it,started her up no faults came up.
so revved up to where it starts to miss and egr fault came back,said low flow on egr!!

so we had a good check around,there was good vacume to the egr vacume valve,good vacume out the vacume valve itself,so we then put a vacume gauge t pieced into the egr and there was hardly any vacume!!

did a manual actuation test via the software and the vacume valve was all working correctly,so we thought um!!

used a manual hand vacume pump on the egr itself,and it will not build up any vacume or move!!its stuck shut!!!it must have some sort of diaphram in there that has gone!!!

if you try sucking the pipe on your tongue,theres nothing,you can blow or suck and its just like an open hose!!but the hoses are fine!!

so i have ordered a complete new assembly,which will be here tommorow,at the ouch price of £317 plus vat! but least i get 15% off!!

so after i have fitted it tommorw im hoping car will be fixed!!!

thanks for all your help guys,you have all been a great help,

 

[Alex Crow]

yes, these valves do split and leak. watch out now, they let soot into the vacuum system and block other things, like the modulating valves for the egr AND the turbo. there will be a small vacuum tank near the coolant header tank, this can get full of soot too, might be worth having a look in the lines for this crud, also in the vacuum tank.

 

[rich.g.williams]

alexander looks like you were 100% bang on right again.

 

[shaun 320cdi]

well,egr came this afternoon,fitted it,and started it up,runs much smoother!! no missing!!! and revs cleanly and easily.no noticable smoke when revved on spot.

left it to warm up,took it out for a drive,goes much better and revs right to redline b4 changing gear,which its never done since weve had it!!!.


but!!!! there is a but!!,it still black smokes alot when you go for it.There isnt much on start off,then higher the rpm goes,more black smoke there is!!

is it just a build up that needs to clear??i did give it a proper spanking for about 15 miles and its no different?

any ideas please guys?

 

[Markieboye]

Try putting some Forte diesel treatment in the tank and see how the smoke it after you refill.

I use Millers DPS in mine and it has reduced the black smoke to nothing

Mark

 

[rich.g.williams]

rich.g.williams

A wide open EGR is unlikely to be causing all this smoking and missing especially at wide throttle openings. The amount of EGR being recycled is not usually so much. Were you to open the EGR at idle you would probably stall the engine or make it run very rough.

Assuming the turbo is OK (not leaking engine oil etc etc) and the inlet pressure sensor (turbo boost pressure sensor) all OK. Faulty turbo boost sensor would make engine more gutless after turbo cuts in.

Is it common rail or not? Assuming fuel pump/common rail whatever, is all OK (understand common rail can be really dangerous to get near!!!!).

Assuming no leaks air or fuel etc etc. You are left with sensors and the computer, MAF sensor, coolant temperature sensor etc etc anything that will cause too much fuel to be injected.

Reading error codes will give you clue - a list of error codes is published and you can get a simple error code reader from Argos.

Might easily save yourself a lot of faf by taking it to S-A-M / U-N-I-T. Mercedes Main Dealer charge 65 pounds to put my car on the star diagnostics reader and do a health check.

A split in one of the hoses from air filter to turbo, from turbo to intercooler, from intercooler to inlet manifold (or in intercooler itself) would easily cause smoking. How about leaking valve stem seals? Has it been using oil?

 

[shaun 320cdi]

HI.it never uses a drop,mrs has done nearly 8000 miles in it,oil has never moved off the max.

il check the hoses and pressure test the intercooler then.

what boost do these engines run??

around 1 bar??

thanks shaun

 

[Alex Crow]

i think the boost actually goes a lot higher than that. but i think your problem now lies with the inlet manifold flaps. we understand from the above posts that they are not working. if they are stuck closed then you will have lots of power, but black smoke at full throttle. you might expect to notice a loss of power with this fault, but this is rarely the case being a forced induction engine.

 

[shaun 320cdi]

HI alex,the servo is all working since car is running properly!

 

[Alex Crow]

if the servo is disconnected at the linkage it will drive great, i suspect it is, you need to be sure! it can be moved by hand, wis suggests this as a test. the whole linkage should have a weighted feel to it as it spins the servo motor. one sure test is to have the engine idling and briefly rev it up - the linkage SHOULD move! if it does not, have another look at the silver connecting rod to the servo, see if that is moving. it is VERY common for the linkage to become disconnected and there is a modified arm available.

 

[shaun 320cdi]

HI alex,thanks very much,i will have a good investigate next then.and thanks for all your help so far.its nice to have the car running nearly perfect!!

if you look through the top by the egr valve where the small silver arm moves when you blip the throttle,where does the linkage connect onto to move the flaps? i can see the small arm on the flaps near the head end but where do i look in between?

 

[kebo57]

if you look through the top by the egr valve where the small silver arm moves when you blip the throttle,where does the linkage connect onto to move the flaps? i can see the small arm on the flaps near the head end but where do i look in between?

Hi found a pics of a 2000 Mercedes CDI E320 Inlet Manifold

 

[shaun 320cdi]

hi kev,thats superb,but can you possibly give me the link of the pictures,as i cant see them clearly and would to try and blow them up.

thanks shaun

 

[kebo57]

hi kev,thats superb,but can you possibly give me the link of the pictures,as i cant see them clearly and would to try and blow them up.

thanks shaun

Hi its ebay
http://cgi.ebay.co.uk/2000-Mercedes...arts_Vehicles_CarParts_SM?hash=item3ca43f6745

Kevin

 

[shaun 320cdi]

Hi kev,still cant zoom in that well,but il have a look at the car tommorow.

can this servo be actuated via the star?

thanks shaun

 

[Alex Crow]

yes, it can, but you don't need to!! does the silver arm move when you blip the throttle? does the linkage move when you blip the throttle? answers needed please.

 

[shaun 320cdi]

alex,il check tommorow,the weather is awful here!!

thanks shaun

 

[Alex Crow]

NO! check it NOW! only kidding , but let us know the results when you get chance...

 

[shaun 320cdi]

Hi alex,the rain has stopped!!so ive been out to check.i would love to know as much as you about these engines!!! your spot on again!!! the silver arm moves back and forth,but linkage does not!!!!!

but if you move the linkage its not stuck!! but only moves as much as in the freeplay of the servo or linkage!!

what next!! i want it fixed now so i can feel the real power with no smoke!!!