Question about 1998 Subaru Forester

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Knocking noise near front of engine - 1998 Subaru Forester

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On a very cold start (eg winter) older Subs often make knocking noise from the LHS of the engine. This is actually quite normal and is a "feature" of the oil paths in the engine. It goes away once the engine is warm.

Might also be the cam belt hydraulic sensor working loose. The tensioner pivot bolt can be done too light or fitted clumsily, and it strips the thread. If it gets too loose, the belt can jump teeth and bend valves.

Posted on Feb 24, 2015

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Posted on Jan 02, 2017

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The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The ECM uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.

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