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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I have a Toyota Corolla 1,6 year 1984. Well maintained, services up to date. Will it be detrimental to engine if I drive steep hills with the car? I have to climb a steep hill to reach work.

not if you drive it accordingly
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for example on a steep grade with a manual 1st or 2nd or possibly 3rd and the rpm around 2000 constant will cause it no harm
automatics will go to first automatically so keep the rpm at that mark
engine damage is experienced when the gear selected is too high and the engine is placed under extreme load so down shift to allow the engine to work easily
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the rule of thumb for experienced drivers is this
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I have an 01 windstar, when i try to go up hill it kinda jumps, like it is not getting the proper gas, and when it is raining it is worse, the rpm's drop and i have to really give it gas to kick in, any...

Going up a hill huh? I've experienced this on numerous test drives. I most always come back to the gap being too large on the spark plugs. Under load, its even harder for the spark to jump the gap. When the gap becomes too large on a spark plug, its due to wear and should replace plugs. I'd start there. The word you used to describe this, "jumps" sounds electrical to me. I know sounds pretty far fetched. :-) but electrical, ie ignitions faults will cause a sharp drop or increase in rpm, it can even seem as if it shakes. Whereas fuel starvation is more like a bogging, Its not a 100% complete drop off like electrical ignition issues can cause. I think the rain thing is coincidental. I can't think of anything regarding engine performance that rain will affect. I'd start with your spark plugs.

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That's called a "knock". You either have carbon on the cylinders which is fixed with a carbon depletion service, or you need to use a higher octane fuel.

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