some time engine become knock when accelatre

2006 TOYOTA VITZ
40,000 MILES
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SAQIBTCP87
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sir i have toyota vitz, from last few days m facing a knocking problem sometimes when i give the accelarator, i change the spark plugs, engine oil, air filter, oil filter also used hi octance, but the problem still remain, what can i do sir ???????????????
Oct 11, 2013 at 9:41 PM
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RASMATAZ
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Where's this knocking noise coming from top or bottom of engine?
Oct 11, 2013 at 10:09 PM
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MHPAUTOS
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If it is more of a rattle on heavy acceleration, scan for a faulty knock sensor.
Oct 11, 2013 at 11:01 PM