MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: ald1717 on June 18, 2022, 10:54:56 pm
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cars being given to my younger brother in a couple of weeks so i thought i would test compresion just incase there was a bad piston or ring somewhere being 16 years old and having 113000k on it,
i was suprised that all 4 cylinders were near identical at 175 psi , really didnt expect that, but what i did realise was that the spark plugs on cylinders 3 and 4 behind the pcv valve had what looked like a slight grayish colouring, is this from being the closest plugs to the pcv return line into the manifold?
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I doubt it is from the PCV tube connected near there. Mine (3 & 4) never appear different. This doesn't mean its rocker cover hasn't separated right near where the PCV-to-manifold tube connects. In guessing, if this were the case, it may dump more oil into the manifold. But is there much oil in the tube itself?
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hard to say there always seems to be a fair bit and i do get the occasional puff of smoke from the exhaust if ive been cruising for a while then com on boost but ive been told this is normal vapours burning and i do have a bigger down pipe and 200 cel,
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hard to say there always seems to be a fair bit and i do get the occasional puff of smoke from the exhaust if ive been cruising for a while then com on boost but ive been told this is normal vapours burning and i do have a bigger down pipe and 200 cel,
Mine was rebuilt at 120k miles. When it first began to release a small puff, was right after lifting the throttle after putting it into boost. Then what it developed was; if I stopped after having it in boost, it would puff again when going back on throttle when rolling from a stop. Eventually it got to doing this more often and produced a more embarrassing cloud. Mine turned out to be worn valve guides, valve stem seals, and rings becoming stuck in the pistons of #3 and #4. In this you can see how much more oil was in the #3 and #4 combustion chambers:
(https://i.postimg.cc/Zq4ywn25/head-removed.png) (https://postimages.org/)