AWX cold running lumpiness

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Evil
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Posts: 191
Joined: Thu Aug 23, 2018 10:27 pm
Passat model: B5.5 Highline
Location: Mid-Suffolk

AWX cold running lumpiness

Post by Evil »

In the last couple of weeks, and only from cold..
Slight rough startup (but immediate, no struggling to start at all)
Then, in the first ~5 minutes, between 1 & 3 times, it chugs like a mofo for a few seconds (and if I power through, there's loads of light coloured (grey I think) smoke)

Soon as the temp gauge starts moving it's fine.. no issues at all.

I've done a 1 litre diesel purge (chugged the whole litre at 2k+ revs, the dregs of the purge liquid were dirty) and also tried priming the fuel a few times before starting..
Air, fuel and cabin filter are less than 5k miles old. It could probably do with an oil/filter change..

Been googling since it started and have read numerous similar threads but none have provided a fix.
Some even say its normal and theirs has done this, in colder temps, for nearly 50k miles - doesn't seem right to me.

Ideas anyone??

93/93

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