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 wrong.ie.the 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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3 Answers

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.


No
not if you drive it accordingly
steep hills are best negotiated in low fears with plenty of rpm applied
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
When going down hill select first and only use the brakes to maintain the 2000 rpm range and allow the engine compression to hold the car speed back
the rule of thumb for experienced drivers is this
you select the same gear to go down that it took to come up

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1 Answer

2005 Toyota Corolla jerking


When does it jerk , all speeds or under a steady load ? going up a hill ? Would you consider it a misfire ? do you know what a misfire feels like ? Do you have a check engine light on or flashing ? Does your vehicle have coil on plug ignition ?

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2001 toyota corolla aut. loses all power goin up hills goes real slow then takes off near end of hill


It looks like your engine needs an overhaul. You can confirm by doing a compression test.

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Is it true that a damaged knock sensor can slow down or make the car lose power while going uphill? Toyota Corolla VE 98


Yes it can. The knock sensor retards the timing due to irregular levels of octane in todays gasoline, to eliminate or reduce what is called a spark knock. A malfunction could cause your car to lose power when car is under a load or uphill due to pre detonation or constantly retarded spark to the engine. If not replaced it can cause engine damage or head gasket damage. Hope this helps.

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What does a knock sensor do


It detects spark knock, usually caused by preignition, and sends a signal to the pcm, so it can ****** ignition timing,so that the spark event occurs a little later, getting rid of the knock, or ping. This usually happens because we run engines on the ragged edge of what is prudent for timing advance, to optimize both power and economy, and when a sudden load is put on the engine, such as passing or going up a steep hill, the timing needs to be backed off to keep the engine from having spark knock.

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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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1 Answer

My vehicle stalls on acceleration


Check that the intake is clear, no blockages(ie paper in the intake or a blocked air filter) if clear feel the coil, is it very hot? Does it only happen when the engine is at operating temp? Coils break down under heat and you loose spark under load(ie acceleration) or maybe you have a blocked fuel filter or pickup filter in your tank which would cause fuel starvation! These are the areas to investigate!

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1 Answer

My nze corolla engine is making a rattling when ascending hills.


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.

Nov 30, 2009 | 2001 Toyota Corolla

1 Answer

The noise sounds like pistons or valves rattling when I have been driving the car a while. It seems like it does it more if I cut the car off and restart a lot, driving up hill, or accelerating.


You need to have the top engine cleaned, it has carboned up and has made the computer not to be able to adjust timing, with the cabon buildup it causes high compressin so the knock sensor and spark advance will not work.

Jul 07, 2009 | 1996 Toyota Corolla

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