thespirit3
Senior Member
Hi All,
My C220CDI is very ill. I'm hoping someone can shed some light on this as the garage are at a loss, and have already cost £500 in parts and labour. For once I thought I'd go with a non-main dealer as I'd had enough of getting ripped off - but perhaps in this instance a main dealer would have been better!
Last week whilst on my commute to work, cruising at motorway speed, suddenly find a loss of power and then a load of grey smoke pouring out of the exhaust. No turbo. Pull over to hard shoulder, wait 10 mins, restart - car ok but still no turbo, limp to services. Leave car 10 mins, try once more before calling RAC and all is ok again (no smoke and turbo back!). Get to work, leave late afternoon - whole thing happens again about 20 miles down the M5 - cover the motorway in smoke
RAC chap comes out, checks all hoses then suggests it's the EGR valve - as this would explain the intermittent nature. He reckoned a split hose or dodgey turbo would be a permanent problem - and wouldn't only happen when the engine was hot.
Now, take to local garage (recommended on this forum - not a mercedes specialist but highly recommended all the same), they read the ECU fault code, and it's something to do with turbo boost (?) valve. They can't be sure if this is the cause or a symptom, so replace it. At my request they also replace the EGR valve as I have my own suspicions of this (previous problem of rough idling during the winter never resolved - always suspected the EGR).
So one turbo boost valve and one EGR valve later, the garage take it out - and when up to temperature it chucks out the smoke and loses the turbo.
Any suggestions at this point would be really appreciated. Anything obvious they may have missed?
For reference, the smoke is grey - like unburnt fuel (over fueling the engine when the turbo has failed?) - not blue or white (indicating head gasket).
I assume something as simple as the MAF wouldn't cause this?
Steve
My C220CDI is very ill. I'm hoping someone can shed some light on this as the garage are at a loss, and have already cost £500 in parts and labour. For once I thought I'd go with a non-main dealer as I'd had enough of getting ripped off - but perhaps in this instance a main dealer would have been better!
Last week whilst on my commute to work, cruising at motorway speed, suddenly find a loss of power and then a load of grey smoke pouring out of the exhaust. No turbo. Pull over to hard shoulder, wait 10 mins, restart - car ok but still no turbo, limp to services. Leave car 10 mins, try once more before calling RAC and all is ok again (no smoke and turbo back!). Get to work, leave late afternoon - whole thing happens again about 20 miles down the M5 - cover the motorway in smoke
RAC chap comes out, checks all hoses then suggests it's the EGR valve - as this would explain the intermittent nature. He reckoned a split hose or dodgey turbo would be a permanent problem - and wouldn't only happen when the engine was hot.
Now, take to local garage (recommended on this forum - not a mercedes specialist but highly recommended all the same), they read the ECU fault code, and it's something to do with turbo boost (?) valve. They can't be sure if this is the cause or a symptom, so replace it. At my request they also replace the EGR valve as I have my own suspicions of this (previous problem of rough idling during the winter never resolved - always suspected the EGR).
So one turbo boost valve and one EGR valve later, the garage take it out - and when up to temperature it chucks out the smoke and loses the turbo.
Any suggestions at this point would be really appreciated. Anything obvious they may have missed?
For reference, the smoke is grey - like unburnt fuel (over fueling the engine when the turbo has failed?) - not blue or white (indicating head gasket).
I assume something as simple as the MAF wouldn't cause this?
Steve
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