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Q: What causes loud knocking noise from Kia Sedona engine but goes away at higher revs?
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What was the purpose of adding lead to gasoline?

Lead was added to gasoline to inexpensively increase octane ratings and to also help reduce engine knocking.Increasing octane and reduce engine knocking are exactly the same thing, as the test method to measure octane of a fuel is to see when a standard engine begins knocking. The higher compression ratio the standard test engine can be operated at without knocking, the higher the octane of the fuel being tested.


What can you do to keep your car engine from knocking?

Either get higher octane fuel, or retard the timing. That is about the only thing that will help


How petrol knocking is different from diesel knocking?

they are the same thing. "knocking" in an engine is the fuel igniting from the heat of compression of the fuel and the air together. in a desel engine this is how it is suposed to work because it has no spark plugs so the only way to ingite the fuel is by compressing the fuel and the air by a ratio of about 22 to 1. in a gas engine the fuel is ignitied by a spark plug, if you use low grade fuel the explosion can happen too early (before the spark plug ignites it) and cause a knocking noise in the engine whitch can cause dammage long tearm the typical compression ratio for a gas engine is 10 to 1. the more compression you have the higher grade fuel you need to prevent "knocking" whitch is why higher end cars need higher grade fuel because they have higher compression engines whitch make more horsepower with omperable size engines.


How do you help engine knocking?

there are a few reasons for engines knocking......... - bad type of fuel - higher gear ratio at slower speeds if your engine knocks when you start it up then you have probably got a bad or dirty fuel in your car... change the filters or just get away with using it and change your petrol station if the engine knocking happens during driving then its because you are putting more gas on at lower speeds and higher gear ratios...you just need to lower your gear. say change from gear 3 to gear 2 and try increasing the gas gradually and slowly and the knocking should go away....


What would cause a ticking noise in the engine when going up a hill?

Most likely is knocking. Try next higher octane grade of gasoline.


What would cause a knocking noise on a 1999 Saturn even when it is warm?

Knocking is caused by preignition, where the heat in the cylinder causes the gas to ignite before the spark plug does. Try using a higher octane/grade gas and see if the noise goes away.


What causes spark knock in a 1992 mercury topaz 2.3 engine?

Most likely the timing is a little too high for low grade octane. Either go to a higher octane ( $$$$ ) or best, with a timing lite, just lower the timing till it stops knocking for the fuel that you are using.


What is the rattling noise when you accelerate in your 01 Tacoma?

Knocking sounds like someone repeatedly rapping the engine with a hammer, and the quieter pinging resembles marbles being shaken inside a tin can. Knocking and pinging are actually symptoms of abnormal combustion in an engine, mostly heard when it is under heavier load, during acceleration as opposed to cruising. What causes abnormal combustion? Many things, some of them avoidable and some of them not, but the common solution to almost all of them is gasoline with a higher octane rating


What causes knocking in engines?

Could be low octane, Buy an octane booster and pour it into your gas tank (only costs a few dollars) or try a higher octane gasoline.


Why does your truck knock and smoke?

It usually happens in high mileage engines that have excessive wear to the main bearings (which causes the knock) and too much wear to the oil rings on the pistons (which causes the smoke). A slight knock can mean that you need to add a higher octane gasoline, however, when both knocking and smoking occur, it probably means that you'll have to have the engine overhauled.


What is the most common cause of an engine knock when accelerating?

Engine knock can be caused by several things. Carbon deposits in the engine can effectively raise the compression ratio of the cylinder. When accelerating, the cylinder gets filled with more fuel and air, and the higher compression ratio causes knocking. Other possible culprits could include spark plugs being too hot or your timing being off.


Does higher octane gasoline give you better gas mileage?

No. If your car runs well on a lower octane gasoline (i.e. no engine pinging or knocking), then putting a higher octane gas in your tank is just wasting money...