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You just put a higher octane gas in your truck -87- instead of -85- why is your engine making weird pinging noises as you give it more throttle?
Wiki User
∙ 14y ago
Engine has a knock sensor and detonation sensor. Higher octane fuel causes changes the flash point, meaning that the fuel is burning at a different temperature.
Wiki User
∙ 14y ago
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Does 2002 vw passat v6 engine need 91octane fuel?
Yes. It's a higher compression engine which requires a higher octane level to help prevent "pinging" in the engine. This engine does have the intelligence built-in that detects "pinging" and retards the engine timing to prevent to pinging from occuring. Pinging is when the gas explodes early while the piston is still going up. This can cause damage to the piston over time, something that's expensive to fix. If you put 87 octane in the tank the car will detect the pinging early, retard the timing to save the engine but the fuel economy and performance goes down. Generally speaking you'll pay more in gas by dumping 87 in the tank than filling it up with the good stuff since the performance is better.
Does higher octane produce higher co?
Higher octane is helpful for high compression engines. High compression causes the combustion to take place faster and can cause pinging and a loss of power. By using high octane with high compression you get the advantage of the extra efficiency of the high compression engine and the delivery of the combustion across the power stroke of the piston, with out pinging.
What pressure ratio causes knocking in a petrol engine?
The pressure ratio does not cause pinging in an internal combustion engine. Pinging is the result of the air/fuel mixture igniying before the piston is in the propper position. Chep gas will cause pinging because it is igniting too quickly. Too high a compression ratio will do the same thing. Ingnition timing that is too far advanced will do the same thing. Back off your ignition timing two degrees at a time until the pinging stops, or buy a higher octane fuel.
What are the symptoms of a bad throttle position sensor in a 91 Saturn sl1?
A bad throttle position sensor, on your 1991 Saturn, will cause the engine to run rough when it is idling. The engine will run normally at higher speeds.
What is the cylinder compression of a mercruiser 7.4 mpi engine?
MY Mercruiser 502 8.2L V8 between 133-155 pounds pressure dry, not warmed up & throttle at idle instead of wide open throttle. I was comparing the difference between the cylinders seeing if anything was obvious bad... Warmed up... Open throttle valve will give you a higher reading.
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...
Why does the valves rattle after having the head machined on a 4.3 engine?
The valves are rattling because they are not adjusted properly. Now if you are referring to what is commonly called pinging, that is another thing altogether. You just had the head machined. If you mean you had the head plained down, then that increased the compression ratio of the engine. You may have to move up to a higher octane fuel to stop the pinging.
How to stop pinging in your olds with 305 engine?
Either find a way to lower the compression, or use higher octane gas. Pinging is caused by premature ignition of the fuel, usually due to compression. Higher octane fuel is less combustible than lower octane fuel, so it's usually a good solution. With gasoline prices what they are today, using premium in an engine that was designed to run on regular is an expensive solution. You may end having to do that very thing but try some other things first. First have the timing checked to see if it is correct. If it is then purchase a can of a product called Seafoam Motor Tune. www.seafoamsales.com Put one can in the fuel tank according to the instructions on the can. I have seen this product work wonders at removing carbon deposits which can cause pinging. If one or two cans does not fully clean the carbon out, you will have to inject it directly into the intake. Do this according to the instructions on the can and follow them carefully. This should remove enough carbon deposits to stop the pinging. Pinging or pre-detonation is harmful and is something you should not ignore. Also check for any vacuum leaks, blown intake gasket, loose carb or throttle body, which can also cause pinging.
What causes pinging in a 2011 polaris 550 ATV?
Try using a higher octane gasoline in this ATV. Many times the pinging is due to not using a 91 or higher octane fuel. A lower fuel like 85 or 87 may not be burning off as efficiently as the 91 octane which in turn will cause the pinging.
How can I fix the pinging which only occurs while using regular gas in my 1998 4.2L F150 engine?
your engine is craving a higher octane fuel, run a tank of premium or use a bottle of octane boost every now and then and that should satisfy it for a while.
What is the fuel pump pressure on a 1990 Chevy pick up with throttle body 350 engine?
9 to 13 LBS. NO lower are HIGHER.
What is the recommended gasoline grade for a 1991 Honda Civic LX?
87 Octane. Using a higher grade is a waste of money. The engine will perform no better and get no better mileage. The only time a higher grade is necessary is if the engine is experiencing pre-detonation, commonly called pinging, and you cannot otherwise cure the problem. As per the original manual you should use 91 Octane. Using lower octane will result in pinging and some time loss of power specially when climbing uphill. If you have high milage on the car I would recomend to use the 91 octane and go for a highway drive from time to time decarbonized the engine. 1991 Honda Civic LX needs manual valve adjustments that will make the engine run smoother and quiter. Loose valves are sometimes mistaken as pinging.
