Question about 2001 Toyota Corolla

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I have a 2001 toyota corolla and I want to know what causes spark knock in the engine when its under load '' ie '' going up a hill kicking into overdrive etc... I have changed the spark plugs aand used high octane fuel! What could cause this?

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The timing of the motor is spark timing in relation to the pistons.With the knocking,this usually relates to the timing being to far advanced.As the only real adjustment that can be made is the timing,get it retarded slightly.A very simple job with a timing light.The marks on the crankshaft pulley are easier to see with a bit of white chalk on them.Whilst doing this,check the timing auto advance by bringing the revs up and you should see the marks on the pulley move.If so.All is correct.(when you set the timing,the vacuum advance hose has to be removed so as not to give a false reading)I hope this is of help

Posted on Sep 27, 2009

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