Question about 2001 Toyota Corolla

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Engine ckeck light turns on even running by octane.

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Engine lights are there to let you know that the parameters for safe engine / gear box operation have been exceeded and you need to check oil levels , coolant levels , drive belts and temperature range .. Run fault codes to detect which sensors raised the alarms.

Posted on Apr 19, 2014

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Changed out the knock sensor and engine light is still on

Some engine lights don't turn off until the car is driven for awhile. Give it some time. If it doesn't go away, take it to Auto zone to clear the engine code. If it comes back, then it might be a wire problem and not the knock sensor itself. Good luck!

Feb 24, 2016 | 1994 Pontiac Bonneville


Octane Myth

What is octane? Octane cannot be seen, but it is of utmost importance when it comes to gasoline. One thing for sure, higher octane fuel costs more. Allot more! Simply put, octane is a measure of gasoline's ability to resist detonation, which you hear as pinging and knocking in your engine. The higher the octane the more the fuel can be compressed without detonating before you want it to. Detonation, ping, knock, whatever you want to call it, occurs when the air/fuel mixture ignites before the spark plug fires. The mixture ignites from compression and not from the flame of the spark plug. In other words, the higher the octane the less likely it is to ignite prematurely. The only benefit to a high octane fuel is that it allows an engine to run at a higher temperature and with a higher compression ratio without pinging. Higher octane fuel does not provide more energy, more power, better mileage, more torque, burn cleaner, clean your engine, and is not better for the environment. If the engine is pinging when using the correct octane fuel, then it may be necessary to move to the next higher octane to prevent pinging, and damage to your engine, unless there is another problem. If you are using higher octane fuel for any of these reasons, STOP, you are throwing your money away. Also, never use a lower octane fuel than is recommended by the manufacture. If the manufacture recommends 89 octane then use 89. If they recommend 87 then use 87. The key is what was the engine designed to run at to achieve optimum performance and mileage? One exception is when you are towing a heavy load with a vehicle designed to run on 87 and you experience pinging. In that case it may become necessary to switch to 89 while towing. In conclusion, race car engines are designed to run on high octane fuels due to their high compression engines. You cannot make your engine a race engine just by upping the octane. Save your hard earned money, and use exactly the octane you need.

on Jun 19, 2010 | Honda Accord Cars & Trucks

2 Answers

I have a 1993 Mitsubishi Mightymax 2.4 L4 and i just replaced the timing belt. I need a diagram or something of the sort to adjust the timing, as i have already done by ear but isn't completely...

if you done it by ear --ie turning the distributor then you are not far out akthough a professional mechanic might get it a bit better i mean by this a old school mechanic but if your in doubt then use a timing light and set timing to to about 6 to 8 degrees before TDC depending on the compression ratio and fuel used ,an old GT type engine can be as high as 12 or 16? running on 101 octane fuel but a newer vehicle running on 91 unleaded will be around 6? maybe even 4? ,The octane rating is the amount of additive used to prevent pre detonation of the fuel but certain refineries sell this low grade low octane fuel that isnt of the same standard and the flame rate when it burns is a lot lower and also the carbon it produces when it burns is greater .no if it sounds ok and doesnt pink or overheat then leave well alone

Oct 06, 2011 | 1993 Mitsubishi Mighty Max

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Developing a ping... not bad gas, low miles

It may not be bad gas, but it could be the wrong octane rating for that engine. Check your owner's manual and see what octane is recommended for that engine. If you're running 87 octane and it requires 91 or higher octane, then you need to be running the higher octane fuel. By running lower octane fuel in an engine that requires higher octane, your getting pre-ignition, the knocking sound you hear. What's happening is that as the piston moves up on the compression stroke, the gas/air mixture is compressing and as the pressure goes up, so does the temperature of that mixture. It's possible that temperature can get so hot that the gas/air mixture ignites from the high temperature and not from the spark plug. Higher octane fuel will help this since higher octane fuel is harder to ignite. I say try running some 92 or higher octane fuel in your car and see if you still hear the knocking.

Jun 06, 2010 | 1986 Lincoln Town Car

1 Answer

1992 Chevy S-10 Pickup 4.3L 6 Cyl. Engine sputters


Feb 17, 2010 | 1992 Chevrolet S-10

2 Answers

Check engine light on pontiac g-6

Try running some fuel injector cleaner through the fuel system and going up on the fuel octane rating. The fuel octane rating for the car is 87, try running the 89 octane for now. As the car get's older, carbon builds in the the cylinder and valves and they may be causing the detonation during the morning drive up the hill. As the engine advances the timing for more power going up the hill, it sounds like it's causing the misfire. A higher octane rating fuel should help this and a clean air filter too. The check engine light is just indicating that there is an issue with the engine and it's compensating the problem. When the light comes on when there is a misfire, the engine's ecm will turn the timing back and will bring the timing back to where it should be at the next start up. If you do mostly city driving at short duration, there will be more carbon build in your engine and changing the oil and filter is a must more then doing long hi-way drives. Good luck and keep me posted, be glad to answer any more questions you may have.

Aug 14, 2009 | 2006 Pontiac G6

1 Answer

Check engine light on. had mistakenly filled w/87

Different octane fuel should have no real or lasting effect on your car except perhaps a bit of slight detonation. (computer will normally compensate for this by retarding timing a bit. Since you added higher octane fuel, the mix should be slightly higher than in the beginning. To improve octane of remaining fuel you could add 3oz of acetone to each 10 gallons of remaining fuel, or drive it and keep adding 93 every time you use up a quarter tank.
I think that you may not be having a problem with the fuel itself but may have an improperly sealing fuel cap. That would turn the light on.

Jun 21, 2009 | 2002 Volvo S60

1 Answer

My Peugeot 206 has a rattle

Sound like pre-ignition problem. pre-ignition is caused by running too low an octan fuel in the engine. The way octane works is simply the lower the number the faster the burn. If the fuel burns before the piston gets to the proper position in the cylinder it can cause what is call in the industry a ping. The remedy is to use a highert slower buning octane fuel or change the ignition timing. Mind you some engines with higher compression may not like the lower octane fuel even after adjusting the timing.

May 05, 2009 | 2005 Peugeot 405

1 Answer

2002 4cl vue service engine soon light on

I have the exact same problem it took awhile before I figured it out.This car requires the medium octane gasoline .The 87 octane gas causes the engine to run on the lean side and triggers the "service engine soon light".By putting in a higher octane gas (middle range 92 octane) the light won't come on.Or you can get your service mechanic to set a richer gas mix for your car,however you'll lose about 2-3 mpg .

Apr 13, 2009 | 2002 Saturn VUE

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