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It shouldn't. Most production vehicles built from 1990 to date, have a "knock" sensor which accommodates different octane levels.
Yes, they could knock it sideways, then it's dead.
It will sense the engine pre-detonating fuel(usual cause is fuel octane level to low). ECU will adjust timing to prevent damage to engine.
Perhaps--unless the sensor itself is bad.
You may be able to change octanes between seasons ( reduce octane in winter ) to obtain the most cost-effective fuel without loss of driveability. The manufacturer's recommendation is conservative, so you may be able to carefully reduce the fuel octane. The penalty for getting it badly wrong, and not realising that you have, could be expensive engine damage. If you use a fuel with an octane rating below the requirement of the engine, the management system may move the engine settings into an area of less efficient combustion, resulting in reduced power and reduced fuel economy. You will be losing both money and driveability. If your vehicle does not have a knock sensor, then using a fuel with an octane rating significantly below the octane requirement of the engine means that the little men with hammers will gleefully pummel your engine to pieces. The bottom line is that you might be able to move to a 89 octane level fuel but it will cause a loss of power & mileage, and may cause engine damage. My advice is to use the exact octane fuel listed in your owner's manual. That way you get to most the engine has to offer, in power & mileage. And you do not take a chance of ending up with engine damage.
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.
The knocking sound that the sensor is designed to detect is caused by uneven combustion of a lower octane gasoline than the engine is able to burn efficiently. The knock sensor signals the Electronic Control Unit and ignition timing and other engine parameters are changed to eliminate the knocking. Knocking, if allowed to continue over a long time can seriously damage the engine. --Ken
I definitely DON'T recommend anything but premium fuel. We tried two tanks of mid-grade (89 Octane) in our '99 Q45, and experienced several problems soon after (knock sensor, IACV, EVAP valve, air flow sensor). Coincidence? Maybe...maybe not. The emissions system has to try to compensate for the lower octane, which could "stress" the various components.
It calls for 91 octane fuel. However the engine does have a know sensor so it will adjust ignition timing to keep from damaging the engine if a lower octane fuel is used.
Your knock sensor may not be the problem. If your trying to used 87 octane fuel and your service engine soon light is not on, you may just need to use a higher octane fuel. I know the manual says you can use 87 octane fuel, but my 97 Interceptor knocked like crazy the first time I put 87 octane in it. I let my fuel get real low and filled up with premium (93 Octane) and my knock problem disappeared immediately. Hope that helps. I had tried all brands and grades availaible in my area with no luck. turns out this unit and year had no knock sensor. had to replace maf, problem solved and gained 1.5 mpg on average. no knock from 0 to 125mph thanks
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No, the knock sensor is not the same as a throttle position sensor. The knock sensor is used to determine if the engine is knocking caused by too much spark advance for the octane rating of the fuel being used. The throttle position sensor tells the engine computer what the position the throttle valve is in to determine gasoline flow .