Question about 1993 Chevrolet K1500

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2004 trail blazer knocking sound from engine. Started intermiten and then progressed into louder sound.

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Bad news...that generally is caused by a bad rod or main bearing (both require engine removal to do it correctly) Or, other cause can be a broken (cracked) flywheel. Bearing problems are generally accompanied by lower than normal oil pressure. flywheel just makes noise with no other symptoms. Have a good reliable shop check it It takes some real experience to differentiate between these noises so only use a shop with good techs and reputation.
If the noise is tapping and not knocking it can also be a rocker arm or lifter.

Posted on Nov 17, 2009

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