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Engine making a loud knocking sound - 1995 Mercury Grand Marquis

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Is the loud knocking sound coming from the top section, or the bottom section of the engine, if it's from the bottom, it could be a connecting rod, that is going bad, also if it's from the top of the engine, could be in the rocker arm assembley, this is where your valve spring, rockers, and retainers, and tips of valves are located, also have someone to see if the knock sensor is bad, normally , these are located not to far from the crankshaft pulley up from the bottom of engine.

Posted on Mar 22, 2011

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