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Message: <blockquote data-quote="sb3" data-source="post: 3341925" data-attributes="member: 12180">Like I've said earlier , try the cheap stuff 1st such as changing petrol brands. If that does not solve the problem, borrow from any ceffie members the scanner or code reader to find the fault. Pls note that we cannot advance /retard our VQ timing manually as the ecu controls it . My best bet would be the knock sensor.If there r no generous ceffie members willing to check/scan the ecu for u, i suppose u have to go to Tan Chong Motors or any workshop for further diagnostic scanning.(Sorry I dont have any scanner/fault code reader).<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/itsme.gif"  class="smilie" loading="lazy" alt=":itsme:" title="Itsme    :itsme:" data-shortname=":itsme:" />Pls : u could also hear alot of proton iswara knocking coz they dont have the knock sensor, hehehe... Bump: Stephen , when u 'WOT' , massive air are being suck in to the intake manifold, sometimes too much for the ecu to retard the timing fast enough/correctly. As such the spark will ignite too early for proper combustion, hence knocking will occur . It could also be the knock sensor problem. The knock sensor have failed to detect engine knocking so it is unable to inform ecu to retard timing or squirt more fuel to compensate. The third reason could be there are carbon deposits or sludge found its way on top of the pistons and around the combustion chamber. These deposits become so hot that they will ignite the intake fuel even before sparking occur.:sleep:</blockquote>

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