All Things Mk5 > How to Guides / Troubleshooting

Fuel dilution in oil

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44 BU:
Yeah I guess you're right, I have been doing constant short journeys and the car hasn't been warming up properly. Have got the same answer from a few specialists.
Thanks for your time, much appreciated.

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pudding:
Interestingly enough, I checked my oil level today and it also stinks of rich running. Also Revo Stage 1  :grin:

Did your car exhibit any kind of part throttle weirdness?  A bit surgey, jolty and unresponsive?  But OK in boost?

I think my injectors are going bad (again!) as the above is a classic sign of one or more injectors on the way out.  Thought I'd drop that in here just in case you've got the same symptoms.

Basically, one or more injectors is dribbling causing a rich condition, which the lambda control fights, but also makes the working injectors run leaner as it only measures the sum of all 4 cylinders, not individually, hence the part throttle wobbles.

That would certainly make the engine oil stink of over fuelling.

44 BU:
Ah, that makes sense. My car does feel jolty at times and tad bit irresponsive but I thought that's how they were. How would you describe the surge that it does?

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pudding:
Changed my oil over the weekend and it's fine again now.  I'd also over filled it at the last change (approx 7-8mm above the max mark) so it looks like the lambda control was indeed fighting excessive PCV gases.

Checked the spark plugs and they're all the same colour, so maybe the injectors aren't as bad as I suspected.

The surging is more noticeable when trying to hold a steady speed in 3rd or 4th.  It just feels a bit stumbly coming off/on the gas and also a wavy power delivery.  Not smooth and decisive as it should be.  Onset of boost is also bit unresponsive.  At higher speeds/gears, holding a steady speed needs constant throttle where normally it would just pull itself along, just by resting your foot on the pedal.

It's hard to explain really, but after driving a 'normal' car for a while and jumping back into the GTI again, you definitely notice it!

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