engine knock

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May 19, 2003 | 11:09 PM

old pig

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engine knock

my truck has an engine knock when accelerated. What could it be?

May 20, 2003 | 08:02 AM

sgreen

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From: taylor usa

engine knock

Most likely it is a rod knock if it happens while under hard acceleration.

Scott

May 20, 2003 | 10:39 AM

William

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From: Sun River St. George

engine knock

Welcome Old Pig! Rods will knock all the time, especially under no load (reving the engine). Knock on startup before oil pressure comes up is also common. Knocking under load, like pulling a hill in third gear can be caused by advanced spark timing, low octane fuel or a higher compression ratio. Spark knock is very bad and will destroy your pistons. Try some 93 octane and set your initial advance at 8BTDC. Post Back