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Hi, new here so go easy ?
2000 1.6 petrol manual 160k miles
White smoke at idle but clears, fouls plugs after about 500 miles giving a misfire, the car only cost £150 but removing the plugs everytime is total ballache!
I've replaced crankcase oil vent thingy and breather hoses which are all clear of muck, how can I test if it's valve stem seals causing this? Would like to fix as apart from this issue she's great ?
 

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Here is a good page: to start looking over the possible causes of your exhaust smoke:

https://www.freeasestudyguides.com/exhaust-color.html

You might start with a compression/leak down test and that would rule out worn rings; a bad head gasket could show up as certain cylinders with low compression or high cylinder leak pressure, when doing a leak down test, then a coolant combustion leak test, could confirm, weather or not, you have a failed head gasket.

According to the linked ASE page; valve seals tend to cause smoke on a cold engine and then, when it is warmed up, the smoke goes away, as the seals start working better.

So, it sounds like some testing is in order; i don't know about the UK/Europe but here, in the USA you can rent engine testing tools/equipment at most auto parts fo free. Otherwise, places like tool stores or auto parts stores; sell these tools for reasonable prices.

From what i hear; machine mart is a popular tool store and sells auto tools at reasonable prices and local, close by, to most UK residents:

https://www.machinemart.co.uk

If you haven't already, it would be a good idea; to buy the Haynes service manual; it is cheap and will help you do repairs correctly, on your new beetle:

https://www.amazon.co.uk/Service-Manuals-Henderson-13-May-2013-Paperback/dp/B012HV12E2/ref=mp_s_a_1_fkmrnull_5?keywords=haynes+new+beetle+service+manual&qid=1557111017&s=gateway&sr=8-5-fkmrnull

You can also buy it from the Haynes website with free shipping and they are currently on sale:https://haynes.com/en-gb/search?query=2002 Volkswagen New Beetle

Let us know, how you want to proceed with testing/repairs and we can go from there. Thanks! <img src="https://newbeetle.org/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />
 
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