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Here are some alternate things that can cause knocking nad pinging:low coolant level that allows the head to get too hot, bad thermostat and also excessive combustion chamber deposits that become pre ignition hot spots.
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1998 Nissan Frontier XE/2wd/5spd 1 owner, 264k miles
1985 Olds Cutlass, 350 Chevy, owned for 14 years
WANTED: 1968-1973 Datsun 510 or 1991-1994 Sentra SE-R
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