Your auto was not designed to operate on E-85 fuel... Buy regular gasoline instead!
The knocking problem you are having is most likely the gas you are using. If you switch to a higher octane fuel it should solve the problem.
The knocking noise is commonly called spark knock. The knock can be called by the engine timing not being set correctly, or using gas that has too low of an octane for the engine.
An engine with a knocking noise is almost always a serious condition but not always. When you say knock, if you are referring to what some would call a ping, then that is not so serious and can be caused by simply using the wrong octane fuel. If your engine requires premium fuel then use only premium fuel. If it requires regular then don't waste your money on premium as it will provide no benefit. The condition is more commonly called pre-detonation. It can also be caused by carbon deposit buildup inside the cylinders. Using the wrong spark plugs can cause carbon buildup and pinging or knocking. Dirty fuel injectors, a bad knock sensor and an engine running too hot will also cause a knock. But the most serious reason for a knock is worn crankshaft or piston bearings. The only fix for this is an engine overhaul. Have your engine diagnosed by a professional to see what is causing the knock. You may only need to have the carbon deposits removed to solve the problem.
A knocking engine in your 1990 Olds 88 could be due to several issues, such as low oil levels or poor oil quality, which can lead to insufficient lubrication. It might also indicate problems with the engine's bearings, piston slap, or even pre-ignition caused by using the wrong fuel type. Additionally, a failing timing chain or belt can cause knocking sounds. It's important to diagnose the problem promptly to avoid further damage.
Knocking is caused by preignition, where the heat in the cylinder causes the gas to ignite before the spark plug does. The noise could also be piston slap, which is caused by a worn cylinder wall. Try using a higher octane/grade gas and see if the noise goes away. In certain engines like the Malibu 3.1 liter and others, the knocking is caused by a piston rocking in the cylinder. This is called piston slap. It is a damaging condition, but seems to be considered "normal" by GM.
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.
In a petrol engine, "pinking" refers to abnormal combustion in the cylinders, often caused by premature ignition of the air-fuel mixture. This can lead to a knocking or pinging sound, potentially causing damage to the engine if not addressed. Adjusting the ignition timing and using higher octane fuel can help prevent pinking.
In some of GM's engins they put under sized bearing, try using an Ac oil filter.
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....
Using more alcohol in a gasoline mixture can increase the octane rating, which can improve engine performance and reduce engine knocking. Additionally, alcohol is a renewable resource, which can help reduce dependence on fossil fuels and lower greenhouse gas emissions.
Solve the problem using the + sign for the variable. Then solve the problem using the - sign for the variable. Report your answer as the answer that you got using + or the answer that you got using -.
A tick in a lifter is likely caused by poor fuel. Using a higher octane fuel will often stop the knocking or ticking.