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Subaru Forester 2005: Shocking knocking under light acceleration

Asked by David Hollibone

I HAVE a MY05 Subaru Forester XS Auto with about 10,000km on the clock. For the last 5000km I have noticed a knocking noise coming from the engine under light acceleration (1500-2000 revs). My dealer suggested it was caused by poor-quality fuel and suggested I switch to PULP. I did and nothing changed. The problem occurs only when the vehicle is in drive and moving. Any ideas?

Answered by CarsGuide

27 Jan 2006 Graham Smith

WE APPROACHED Subaru for its thoughts. The company said it is difficult to accurately diagnose the engine noise without hearing it or knowing the specific conditions when it occurs. It is possibly caused by pinging or by pre-detonation of the fuel in the combustion chamber and this can be the result of the quality and/or octane rating of the fuel. If the dealer cannot determine the actual cause, it can ask for help from Subaru Australia's technical support department (ph: 1800 226 643) so more specific information can be obtained to assist the diagnosis.

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