All Things Mk5 > How to Guides / Troubleshooting

gray smoke again done a search but still confused

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jay26r:
3" turbo back with decat so ots not that

r5gtt:
That's as far as my thinking goes I'm afraid.

Actually check your plugs for contamination?. which plug brand?.

Dan_FR:

--- Quote from: jay26r on May 26, 2016, 09:53:14 pm ---Got under it earlyer and have noticed the 2nd 02 sensor is not fitted  :thinking: this may be the route of it !?!  Think if it was the way it is due to mods it would be like it all the time , also seems excessive so can't imagine any tuner would let a car go out like this , and if im honest i dont remember it being like it on the test drive and first day or so of owning it .
I did the oil swap to the recommended nanno drive , changed the plugs earlier and noticed i have oil leak onto one of the spark plug wells from the rocker cover gasket , so these will be my first fixes

--- End quote ---

Secondary Lambda needs to be fitted. What you describe sounds like some oil burning. You won't know what until you start ripping the car apart. Is it too much to live with


--- Quote from: r5gtt on May 26, 2016, 10:04:17 pm ---The second o2 sensor just monitors the efficiency of the cat so that will have nothing to do with it.
Could be a blocked up cat?. Actually saying that now, a bmw had similar issues at a garage I was visiting and the owner cleaned it out with this chemical and sorted the problem out. This could be totally unrelated to your issue.

--- End quote ---
not quite true. Second lambda isn't just for cat efficiency, it is also used for secondary fuelling correction so it needs to be fitted.... unless the secondary fuelling correction has been disabled properly, which I doubt.

r5gtt:
Oops my bad. Thanks for the correction  :stupid: must be old age getting to me  :doh:

jay26r:
doesent seem to be using oil but i was thinking this might be the case dan, fitted the 42 draft desing catch can system and it made it worse. so thats back off
also noticed that there is no check valve in the rear pcv breather that goes to the turbo ???

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