Hymer Mercedes Turbo Woes (1 Viewer)

[gus-lopez]

& whilst eating my tea I have remembered that when it plays up , no power, nothing happens, tickover only, the engine management light does not come on . Not on my car anyway but the fault will be shown if you read the codes.

 

[DavidG58]

& whilst eating my tea I have remembered that when it plays up , no power, nothing happens, tickover only, the engine management light does not come on . Not on my car anyway but the fault will be shown if you read the codes.

may not be my issue then, put in neutral I can rev to 4000rpm, just wont move up a gradient in drive, going to investigate this though as easy to work on compared to under bonnet and relatively cheap

 

[Phillybarbour]

Not a Merc but had that exact symptom on a Ducato (not motorhome), new pedal unit diagnosed, fitted all was fine thereafter.

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[haganap]

Feel for you David. .nothing worse than an intermittent fault

 

[andy63]

David..does anyone at the garage you use have the ability to use a scope. Even if it's not flagging up codes the sensors and actuators could be checked for correct function with a scope... its just finding somewhere that uses one and knows what they are looking at...
Really hope you get sorted... I'd be loosing the will to live...
Andy.

 

[DavidG58]

Limped it back to the workshop today, failed once on the way but reset with a stop / start of the ignition, which now means it is in working order so probably nothing to find, again

Will probably just have to start changing bits and turning to religion

The throttle option is looking interesting as easy to get at and reasonably priced component but going to be checked first, not been plugged in yet, awaiting update following that later today

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[DavidG58]

Thanks all for continued interest and support, it really does help

 

[andy63]

Will probably just have to start changing bits

That's why I suggested making enquiries about a diagnostic place that can use an automotive scope... They should be able to check components and ie throttle ,turbo etc rather than just exchanging bits and hoping that sorts it...
Said all that and I've never come across a garage that can use one.. They all rely on their diagnostic machines and replace component policy... but it's usually the customer that's left with the bill if it's replaced needlessly.. .
Andy

 

[Neilfg]

Sorry to hear the Woes continue, fingers crossed you get it sorted. Am sure that you would get alot of offers for drives to limp onto when you need to venture out again .

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[DavidG58]

still nothing to report other than nothing found, various fault codes, looking like a new turbo may still be needed, then the nightmare of how to get it off and the new one on

this link however sounds just like my problem, getting workshops to try this before committing to the near impossible turbo swap

http://www.pistonheads.com/gassing/topic.asp?t=1513669

 

[funflair]

Got to be in the software really David, a turbo is a mechanical thing and they tend to either work or not.

Have you talked to one of the remap companies, I mean a good one with a rolling road, they are usually able to read deeper into the electronics and mapping than a plug in code reader.

Martin

 

[MR. FUSION]

still nothing to report other than nothing found, various fault codes, looking like a new turbo may still be needed, then the nightmare of how to get it off and the new one on

this link however sounds just like my problem, getting workshops to try this before committing to the near impossible turbo swap

http://www.pistonheads.com/gassing/topic.asp?t=1513669

The problem is often a simple one.....every problem I have I scour the net first. Someone will have had the same problem. If it is this connector can you put some zip ties on it ???? Hope you get lucky!!!!

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[Dave and Ginny]

Probably not related to your problems in the slightest David, but our recent intermittent problems on our Fiat Hymer with limp mode coming on and then engine revving regardless of throttle setting was eventually tracked down to damp and slight corrosion on the ECU connections. This was thought to have come from fine spray getting under the hood when following trucks etc on wet roads.

 

[Neilfg]

Think I would on the phone to All Klasse Autos in Bishops Stortford, trying to speak to Alex. Good luck, would be a good result.c

 

[gus-lopez]

That is the problem with all this electronic stuff literally anything can bring on a eml & limp mode !
Another I have had is an intermittent MAF sensor fault . That is the air flow sensor in the intake manifold. That will bring on exactly what you have .Unplugging it temporarily will make it use the inbuilt data & is ok as long as the vehicle is not driven stupidly ,over revved etc.
.

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[DavidG58]

Posted elsewhere but included in here for continuity, apologies for any confusion due to duplication

It seems like we have little option but to change the turbo on our Hymer, trouble is the only way to it is engine out or possibly / hopefully from top down

My workshop are independent Mercedes but don't do motorhomes normally, after mine if it wasn't for the fact that he is a long term family friend he wouldn't be doing mine let alone any others!!

Has anybody any experience in removing a whole top of dash on a Mercedes based Hymer, 2007/8 model 800S, but more or less the identical dash on current models and quite likely earlier models

Or does anybody already know that we still will not get at the turbo from this route, I don't really want the greasy overalls inside if there is no gain to be made , only joking there, Bev has already issued brand new overalls, but there is no way to get it off from the bonnet access, it looks like we would have to drop the engine if we cant get at it from inside

still only 50/50 we will fix the problem with intermittent limp mode, but have found out there was an issue around that time, only option is full turbo kit from Mercedes, all upgrades / refurbs may well have the original fault still there, not worth the risk at this stage, much too big a job to change to save money on a cheaper option

 

[DavidG58]

Workshop report on the loose cable option, ours is neither tight nor loose, he feels that would be a red herring as it wouldn't / shouldn't clear the fault unless refitted, which makes sense

It seems the box of bits we sent off for refurb is the key to the known fault, but Mercedes will not sell that as a stand alone unit, so a complete turbo is the only option, although as I type this I have just thought we could buy the whole kit and just fit the box which we know we can get at, I am inclined to agree with you Martin it is software not the turbo itself, but buried in the electronic box thingy (hopefully)

So will maybe have an unfitted turbo for sale on ebay soon and more importantly a MH I can drive without fear of breaking down in a dangerous spot, till the next problem that is of course