Mercedes Benz e class W210 320 cdi - Mercedes starting problem - Richard Holling

1 have a 2001 e320, 145,000 miles. Always previously reliable, started getting problems starting, cranking and only going on the second cycle. My garage have changed: glow plugs, pre & main engine bay fuel pumps, all engine bay fuel lines & filter, fuel sensor, injector seals, starter motor, key fob batteries. Battery is good. Drove it home fine, now will not start again. At a loss - any ideas?

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - madf

First of all, change your garage. They are expensive and hopeless incompetents. Fault finding by swapping componenets is a sign of utter stupidity and a contempt for the customer wallet.

Was it running well with full power?

I would suspect some item not covered by the multitude of sensors***.. eg EGR valve clogged, catalyst clogged, exhaust broken and jammed.

*** I assume they did check all fault codes? By the list of changes.. I doubt it...

I have assumed that fuel is getting to the engine .. which is the usual cause of non starting.. but the glowplug relay could have failed... Or a failed off switch which does not switch on properly. and hence the fuel supply is not switching on properly.

EGR valve is remove and check. After 140k miles, bound to be clogged up.

Switches can be checked electrically. Catalyst is remove and check job so leave till last?

You really need a garage which knows what they are doing...

Edited by madf on 16/10/2012 at 10:46

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - atlantmd

madf will a blocked EGR valve cause hard starting. I have a 97 e300 it was very hard started mech changed o rings its better now but it has gone into limp home twice and when mech read the codes he got an EGR fault, also fuel consumption has increased car has 127,000.

should i get it cleaned out, is it a big job?

thanks for any info

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - gordonbennet

Following on from Madf's correct post...incompetence and waste of incredible proportions by that garage...cars like this are best diagnosed and examined by make specific indy's, MB (and BMW) has a good spattering of very knowledgeable specialist indy's dotted about the country.

They are best found by consulting one of the good independent MB owners forums, you'll soon find out where to take the car for expert time served diagnoses from people who don't just fit new parts till they happen upon the cure by elimination.

My own MB indy usually can go straight to the problem with an accurate description of the symptoms, but that comes from being an MB indy for some 40 years.

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - atlantmd

I Undestand what you say. I am in Ireland and MB indy is a long distance away, I was just wondering does a Blocked EGR cause hard start before i get to an Indy as if cost was high i would not waste money on travel and removal replacement.

I am ex Qualified mech 15yrs experience and i have moved onto ther transport engineering carrer but this was purley a tech question.

thanks

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - injection doc

A faulty EGR valve can jam open causing exhaust gases to recurculate stright into the inlet manifold and can make a car impossible to start.

That said it sounds like the garage is imcompetent and just guessing ! fault code reading is an art and you need a good brain to go with it !

It needs to be in a non start mode then start the diagnostics. very prone to injector issues leaking pressure ,causing low rail pressure causing intermitant and non starting !

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - unthrottled

Unless the ECU uses the MAF during cranking, then I don't see how a sticking EGR would cause a non-start issue. The MAF will register very little airflow if the EGR valve is open, but there's plenty of oxygen in the exhaust stream.

Surely the first port of call would be to establish that there's adequate rail pressure during cranking?

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - atlantmd

Thanks for the info. I see people bypassing these EGR but im a believer that car should stay the way it was designed plus its not just a matter of blocking them as some people suggest. I will look into getting Rail pressure checked i must say car is starting better now but the intermittant limp mode is problem.

Thanks for all the advice

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - Peter.N.

You would be better off going to a diesel specialist, they usually know what they are doing and are generally cheaper.

Low rail pressure or a faulty rail pressure sensor are likely suspects.

Mercedes Benz e class W210 320 cdi - Mercedes starting problem - injection doc

" I don't see how a sticking EGR would cause a non-start "

Best talk to the AA & RAC then, we get plenty of non starts with EGR valves stuck wide open !

If you are getting intermitant limp mode you may have an issue with the butterfly flaps in the manifold. Linkage falls apart.

 

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