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Ok I need help. My merc C220d w203 is having a proble it feels and looks like a misfire. It happen constant when I rev above 2000rpm to 3000rpm. Once the engine drops back to idle it take it from 5 seconds to a 60 seconds but it gets its self back under control and stops misfiring. While it is misfiring loads of white/Blue smoke comes out. And it stinks of unburnt desiel fuel.

I have plugged in a code reader there are zero codes and no EML. I'm not sure what could be causing it, it just started out of the blue this morning

  • It sounds like there's a stuck injector where it's always on. I believe they call this stiction. There are products which can take care of this for you like Howes Meaner Power Kleaner and Hot Shot Stiction Eliminator. – Pᴀᴜʟsᴛᴇʀ2 Aug 27 '17 at 15:27
  • If this was the case would it not have a bad idle? – Barkermn01 Aug 27 '17 at 15:45
  • I think a better way of putting what I'm trying to say is the injector is slow to close all the way. Getting the injectors cleaned is a great (and cheap) first step to diagnosing your issue. It happens quite readily and is easily dealt with. – Pᴀᴜʟsᴛᴇʀ2 Aug 27 '17 at 16:19
  • @paulster2 Aren't your comments here better posed as an answer? – zipzit Aug 27 '17 at 16:47
  • It's had a lot of redex diesel Run though it of late and it's running Shell V-Power Diesel at the moment which is supposed to help them keep clean. – Barkermn01 Aug 27 '17 at 17:21
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So since this has been on here a while it turned out that while standard diagnostics did not get any codes a star diagnostics identified that the engine was moving a little too much turned out to be an engine mount was loose.

The reason for taking it into the Garage, in the end, was that the car started applying a Rev limiting factor it would lock me to no higher than 2000 RPM but no Engine Management light would come on.

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