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What would cause this? Exhaust valve

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40
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Fchanes
Posts: 2
Joined: 2 January 2012
Year and Model: V40 2001
Location: California

What would cause this? Exhaust valve

Post by Fchanes »

What would cause this? Exhaust valve #2 cylinder. 2002 V40 1.9L turbo. Only 116k miles. All regular maintenance done on time. Mobil 1 synthetic since new. Thanks.
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JDS60R
MVS Moderator
Posts: 3532
Joined: 21 February 2009
Year and Model: 2007 S60R 2016 XC70
Location: Mount Juliet, TN
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Post by JDS60R »

detonation in the cylinder
caused by hot spot on valve, low octane gas, inoperative knock sensor, oxygen sensors not changed at proper interval, inaccurate MAF (dirty), inaccurate coolant temp sensor,improper coolant ability to transfer heat,improper spark plug or boost regulated without proper computer control.
Retired
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jimmy57
Posts: 6694
Joined: 12 November 2010
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
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Post by jimmy57 »

Also: deposit build up on valve face from short trips and/or slow driving. The hardened valves used do the odd burned away failure. Older valves would have a small spot but these hardened valves look like a cutting torch attacked the valve.
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