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Originally Posted by 504
Maybe 10,000km ago or so, car is only on 55k km, I would say it stays fairly clean due to the location and the small mods I did around the filter, good idea on that though
Just an update, I have since pulled out 3 of 4 ignition coils and did an ohm test on the pins and they seem to come out good so far. I'll try get the 4th out, and maybe even spark plug if possible.
From my last drive the issues occured on very light load application, i.e. full DI so don't think it's a port injector issue also . Anyone have an idea on which sensor would cause such issues if faulty? Maybe map? O²?
UPDATE: MAF looks alittle oily, thanks Steve, map getting cleaned too. I'll report back if this changes anything
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If that K&N filter is one that you oil to help capture dirt and dust, and you found that the MAF sensor that’s in there to be oily, your air filter could still be the original source of the problem. Is your MAF sensor upstream or downstream from the turbo? If It’s downstream, and your turbo is also oil-cooled, you might have an issue with oil getting past the seals and spitting it into your throttle body and also onto your MAF sensor. Not sure how your setup is though, but that would be something to look at if the sensor is getting oily.
After you clean your MAF sensor, and if that temporarily fixes the rich condition, after a hundred miles or so of some spirited driving, you should pull the sensor back out and check to see if it’s oily again. If it is, then you need to figure out where the oil is coming from. The oily and dirty sensor will fool the ECU into thinking that there is more air flowing into your engine than there actually is, which it will then attempt to compensate for with more fuel....up to a point, at which it should then start throwing a code or two.