Ian123 Posted June 8, 2016 Share Posted June 8, 2016 Hi guys... My 2002 wrx has just started to run rough more on tick over once driving seems ok.... I've had a compression test done and cylinder 1 is really low compared to the rest and the car is smoking much more... Is this a valve or piston problem and how I go about checking and fixing.. Ian Quote Link to comment Share on other sites More sharing options...
Scoobyghost Posted June 9, 2016 Share Posted June 9, 2016 What colour smoke are you getting? Quote Link to comment Share on other sites More sharing options...
Ian123 Posted June 9, 2016 Author Share Posted June 9, 2016 Light blue Quote Link to comment Share on other sites More sharing options...
Buggyeye Posted June 9, 2016 Share Posted June 9, 2016 Your burning oil. Could be turbo,piston rings or valve stem seals 1 Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted June 9, 2016 Share Posted June 9, 2016 If it's down on compression I'd say valves or compression rings . either way it's at least a engine out and heads off job .so just in gaskets ,Machining costs and a timing belt kit you won't get much change from £500 . Unfortunately that's without any labour costs and statistically it's more likely to be rings . Which means a full rebuild and a £1.5k + price tag . If it's not broke .....upgrade it 😊 2 Quote Link to comment Share on other sites More sharing options...
Ian123 Posted June 9, 2016 Author Share Posted June 9, 2016 Had replacement cylinder heads on at the beginning of year and all new timing belt due to belt jumping teeth on timing so I swapped the cylinder heads over etc new belt kit etc been running ok for about 3 4 months but now I've this problem Quote Link to comment Share on other sites More sharing options...
Buggyeye Posted June 9, 2016 Share Posted June 9, 2016 Savage is pretty much spot on. He's not often wrong about those sorts. Your definitely going to be a few notes lighter in the wallet to fix it 1 Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted June 9, 2016 Share Posted June 9, 2016 Did you check the deck face of the block for trueness and the piston to deck height before putting the new heads on ? As both of those measurements need to be taken into account when calculating your new head gasket thickness ,especially if you intend to use different version heads on different version bottom ends . Any of those variations could cause a uneven compression ratio and cause the head gasket to fail but scoobs normally push combustion gasses into the coolant when the headgaskets fail (not burn oil) . So I'd check the bores for wear (especially ovality and taper) if everything "looks" ok when you whip the heads off . If it's not broke .....upgrade it 😊 Quote Link to comment Share on other sites More sharing options...
GeoffLeggy Posted June 9, 2016 Share Posted June 9, 2016 Leakage test might give you more info. Quote Link to comment Share on other sites More sharing options...
Ian123 Posted June 10, 2016 Author Share Posted June 10, 2016 How do you a leak test? Quote Link to comment Share on other sites More sharing options...
Ian123 Posted June 10, 2016 Author Share Posted June 10, 2016 Didn't check much to be honest I just managed to get a pair of heads from a rally shop who assured me they were in perfect condition etc... New belt kit new gaskets just got the thickness sizes from goole lol.... Im not a mechanic so I was surprised I got it back running all by myself to be honest.... Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted June 10, 2016 Share Posted June 10, 2016 Only reason I mentioned it is cos it would be nice to know why it's happened (so you can avoid it happening again) . It would be good hear it's just popped the head gasket and lost compression but they normally only burn oil when rings or turbos fail . So to have the combination of oily smoke and lack of compression means it probably rings . Best of luck and let us know what you find when stripping it down [emoji106] If it's not broke .....upgrade it 😊 Quote Link to comment Share on other sites More sharing options...
GeoffLeggy Posted June 10, 2016 Share Posted June 10, 2016 https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=leak down test Quote Link to comment Share on other sites More sharing options...
Ian123 Posted June 18, 2016 Author Share Posted June 18, 2016 Hi guys... Update n advice again time.... Afterdriving car today I had bonnet open and I could hear a hissing sound coming from what seems to be down under/around the turbo area... Could this be anything to do with my compression problem? Quote Link to comment Share on other sites More sharing options...
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