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hi guys i have just bought a 2004 nissan micra 1.5 dci with 85k on the clock its got a really bad smoking problem it will not rev really high ive just recoded the injectors because somebody had replaced 2 new ones but had not coded them so it was really lumpy now its smoother but is spewing grey...

Hi guys i have just bought a 2005 micra 1.2s with 57k on the clock and its smoking ive done a compression test which is excellent and when i took the air filter off it stopped smoking ive heard the crank case breather can clog up is this true or is it the pcv valve if it as one any feedback...