When do spark knocks happen?

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Answers:

How much would it cost to restore a 1980 300 D Mercedes-Benz?(read details)?

When the fuel explodes under pressure due to too low octane rating. The fuel is normally compressed and then will burn when the spark plug ignites the mixture.
When the compression is to high then the fuel will explode before the plug fires, this will be before TDC or top dead center and this will put a force on the piston to return downward before it's ready and you get a knock.

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1995 Camaro Wiper Issues?

This happens when your car's timing is off. To correct this problem you need to turn the distributor one way or the other to retard or advance the timing.

Where are the fuel injectors on a 2000 Ford Mustang?

This will fix your problem!

I have 2003 dodge ram I can't change the vents and i only get high heat no ac can not change the temp at all

Hope this helps

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