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Engine Knock (need all our super smart guys on this) #66084 Dec 7, 1:28pm Dec 7, 1:28pm
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Engine Knock (need all our super smart guys on this)
I want to put together a comprehensive post on what it is and what you can do about it. Mainly because I have it and I want it gone, but then other people will be able to look it up also.

So, with that said. What is it? What causes it? And what can we do about it?


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Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66085 Dec 7, 1:30pm Dec 7, 1:30pm
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Re: Engine Knock (need all our super smart guys on this) [Re: spaztikid] #66086 Dec 7, 1:32pm Dec 7, 1:32pm
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Probably you have to use higher octane number petrol.

Click This

Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66087 Dec 7, 1:34pm Dec 7, 1:34pm
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Ok, now if you have knock, and you put in "Valve Silencer" is that the same thing. Or is silencing the valves and taking away knock two completely different things?


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Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66088 Dec 7, 1:41pm Dec 7, 1:41pm
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Originally Posted by XxMerlinxX
Ok, now if you have knock, and you put in "Valve Silencer" is that the same thing. Or is silencing the valves and taking away knock two completely different things?


I don't know "valve silencer", but don't add it to your engine (if it is a octane booster it might help).

I think you need better fuel (higher octane number)

Which fuel do you use?

Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66089 Dec 7, 1:48pm Dec 7, 1:48pm
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93 Octane from BP


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Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66090 Dec 7, 1:49pm Dec 7, 1:49pm
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OK then, I leave this for someone else grin

Because 93 octane is good enough

Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66091 Dec 7, 1:58pm Dec 7, 1:58pm
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Think all I need is some octane booster?


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Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66092 Dec 7, 2:06pm Dec 7, 2:06pm
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could be higher octane, also you may need
fuel injector cleaner if your injectors have many miles on them.Also check your fuel filter and spark plugs.

Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66093 Dec 7, 5:56pm Dec 7, 5:56pm
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What he said and reset your ecu

Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66094 Dec 7, 9:00pm Dec 7, 9:00pm
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Knock is the when the air/fuel mixture spontaneously ignites prior to the spark being applied. It is caused either by high pressure or temperature than normal. Higher octane gas burns slower and is more resistant to spontaneous ignition therefor a high compression engine like the Celica's needs premium(at least 92 octane) gas. If your spark plug has excess carbon build-up it can create a hot spot in the combustion chamber or if one of the injectors (like was already mentioned) is clogged it can create a lean condition which increases the cylinder temp. causing knock. Check your plugs and if you have white specks on it, you were running lean.

Re: Engine Knock (need all our super smart guys on this) [Re: XxMerlinxX] #66095 Dec 7, 9:54pm Dec 7, 9:54pm
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