W210 E320 faulty starts when warm

[Renoir]

My 1998 E320 V6 has a nasty trick of not starting well when warm and hot. If I leave it stand for about half an hour after driving it wouldnt start normally. Meaning it doesnt run even, trembles, has no power,
sometimes even starts for 2 seconds, gets up to 1,500 rpms, then down to below 500rmps and then dies, and so for 2 - 3 times. then it finally starts but isnt working evenly for a minute or so, then kinda gets better and is ok when driving. It happens when the engine temp is about 70-80C. when its about 50 or less - its smooth.
Cold start is always perfect.

The dudes at my garage blamed one LAMBDA for it and it was changed but nothing improved. Air mass meter was tested as well and is fine. Comp diagnostics was also done of course but it isnt showing anything straight forward.
Has anyone ever got this problem??

 

[BlackC55]

I suspect its ignition related.

Coils, leads etc

When they are hot they tend to missfire more noticeably.

 

[BlackC55]

double post

 

[Renoir]

Doesnt it have something like that fuel pressure accumulator like I read was on Jetronic injection in 80ies? I does behave similar to my old W124 300E which also always caught up for a second and then died when started on warm engine. Always had to start it twice on hot and warm engine, but was perfect on cold engine.

 

[Renoir]

Forgot to mention that if I start it within like 10 minutes from driving, it runs perfectly. If I leave for longer - eg 20 minutes and anything over - it sux.

 

[Renoir]

Another detail - the computer shows incorrect mixture. doesnt it rule out ignition?

And I stand corrected - it doesnt last 10 minutes. it has to be 5 minutes to restart it again perfectly. close to 10min is bad. then it starts to missfire.

Its being tested for the second day already. Hope to have good news today.

 

[Renoir]

Well, my problem is still there. After all possible tests that my dudes could do they found nothing. They tried various things basically by the trial and error method, which I think is quite ok. But the faulty unit was not identified.

Im determined to go to the official dealer as the last resort. They are said to have a more up to date testing computer, and probably more educated in reading what it says.

 

[jberks]

Im determined to go to the official dealer as the last resort. They are said to have a more up to date testing computer, and probably more educated in reading what it says.

Don't forget the mortgage application form.
Seriously, very bad idea. The dealer will have no more idea but will happily replace parts you don't need at top whack prices. A simple fix can run into £100's and they may well not fix it in the end.
Post your location and someone will come up with a reputable MB specialist in your local area.

 

[Cnics]

Many years ago the renault 21 estate suffered from a fuel problem whereby, if the engine was hot and left to stand the fuel would evaporate* around the exhaust area. This wouldn't cause the engine to die completely, often if would more or less stay running but there would be no power at all. this of course never caused a problem on cold start, and no problems when you were running it. It also didn't cause a problem if you started it only a couple of minutes after.


Perhaps the fuel didn't evaporate, but something happened to it due to the heat from the exhaust and the fuel being stood in the pipe close by.


Its just a wild stab in the dark but could it be something similar? I suppose any suggestion has to be better than a trip to the stealers.

 

[television]

Is this fuel related or a bad crankshaft sensor

 

[BlackC55]

If the CKP is faulty is normally does not start at all when hot.

I have just thought of somthing.

Try draining the fuel rail of about 500ml of petrol. (they accumulate water as there is no fuel return)

 

[Renoir]

If the CKP is faulty is normally does not start at all when hot.

I have just thought of somthing.

Try draining the fuel rail of about 500ml of petrol. (they accumulate water as there is no fuel return)

Whats the fuel rail? and where is it?
and what does it do?

ps. I got an appointment to the official dealer for a super duper test that allegedly only they can do. I got big hope on that.

 

[Renoir]

Don't forget the mortgage application form.
Seriously, very bad idea. The dealer will have no more idea but will happily replace parts you don't need at top whack prices. A simple fix can run into £100's and they may well not fix it in the end.
Post your location and someone will come up with a reputable MB specialist in your local area.

Im from Latvia. The prices are quite steep of course at the official dealer but I assume not as bad as in the UK and other countries. I got a contact there who set up this appointment just to perform their full diagnostics with no obligation to change half the engine as it would seem normal for a place like that.

I think I know all the options in Riga to have an MB tested and repaired. Unfortunately, other garages in this country seem to be part swappers or very familiar with M103 engines at best. I had little problems in fixing my W124 300E.

 

[Renoir]

Don't forget the mortgage application form.
Seriously, very bad idea. The dealer will have no more idea but will happily replace parts you don't need at top whack prices. A simple fix can run into £100's and they may well not fix it in the end.
Post your location and someone will come up with a reputable MB specialist in your local area.

Im from Latvia. The prices are quite steep of course at the official dealer but I assume not as bad as in the UK and other countries. I got a contact there who set up this appointment just to perform their full diagnostics with no obligation to change half the engine as it would seem normal for a place like that.

I think I know all the options in Riga to have an MB tested and repaired. Unfortunately, other garages in this country seem to be part swappers or very familiar with M103 engines at best. I had little problems in fixing my W124 300E.

 

[Renoir]

This morning I felt that there was also lack of power on the run... It was really taking its time to start accelerating. Several times I pushed the pedal and was expecting faster response and acceleration. I didnt come at once rather in several seconds only as if sth cleared out. It wasnt so earlier.

Damn.

 

[Renoir]

Well, looks like the problem is solved. The official dealer did all those extreme tests that only they can make and changed the damn MAF. the coupla times that I tried after that I had no sign of the previous problem. it shoulda been there if it wasnt the culprit.

 

[television]

Shame that this was not more obvious, so simple to change