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[marcus]

i find the yaris timing is right on the border of you being able to use 87 octane. slight change of slopes and temp even with its ecu adjusting..gives you a sluggish feel...89 got better outcome..its could also be just my car.. "Dont you guys notice a whirring sound when you accelerate , try driving beside a wall" i need to know if this is normal. or a slight knockin on the engine?

[eTiMaGo]

Originally Posted by marcus

i find the yaris timing is right on the border of you being able to use 87 octane. slight change of slopes and temp even with its ecu adjusting..gives you a sluggish feel...89 got better outcome..its could also be just my car.. "Dont you guys notice a whirring sound when you accelerate , try driving beside a wall" i need to know if this is normal. or a slight knockin on the engine?

I wouldn't be knock, I pored through all I could find in the repair and technical manuals, as soon as the knock sensor feels something out of the ordinary, it will retard the spark, so unless there is something wrong with the knock sensor, you should not "feel" knock for over a second.

[jdium]

Originally Posted by marcus

i find the yaris timing is right on the border of you being able to use 87 octane. slight change of slopes and temp even with its ecu adjusting..gives you a sluggish feel...89 got better outcome..its could also be just my car.. "Dont you guys notice a whirring sound when you accelerate , try driving beside a wall" i need to know if this is normal. or a slight knockin on the engine?

Maybe if feels sluggish because it's only 105 hp going up a hill in hot weather?

As for the whirring sound, it's probably exhaust noise. As quiet as these cars are, there is still some noise. It dissipates easily normally, but a wall would reflect it back to you...

[Pavel Olavich]

Originally Posted by marcus

i find the yaris timing is right on the border of you being able to use 87 octane. slight change of slopes and temp even with its ecu adjusting..gives you a sluggish feel...89 got better outcome..its could also be just my car.. "Dont you guys notice a whirring sound when you accelerate , try driving beside a wall" i need to know if this is normal. or a slight knockin on the engine?

I know the sound you're talking about....my old '97 Camry did the same...that sound is NOT pinging...it is just the fuel injectors doing their thing....yea, my Yaris does the same thing when I drive near a wall....again, not pinging, just valve and injector noise....no worries.

[marcus]

Originally Posted by Pavel Olavich

I know the sound you're talking about....my old '97 Camry did the same...that sound is NOT pinging...it is just the fuel injectors doing their thing....yea, my Yaris does the same thing when I drive near a wall....again, not pinging, just valve and injector noise....no worries.

thanks pavel ur the first to mention the fuel injectors..atleast im not the only one that notices the noiise during acceleration..