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Q:

volvo 1995 850 valve or ring problem, smoking sometime on 1995 Volvo 850

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Ring or valve repair cost
(2) Answers
Check the flame trap box for any restriction first before tearing into the valve stem seals or piston rings. The best way to check if it's restricted is to have the engine run and pull out the engine oil dipstick and see if there are puffs of smoke coming out like a chimmy stack. If so then try a flame trap box first. Also is this a turbocharged 850?