Originally Posted by
Timinator
Not octane sensors, knock sensors. No knock=more timing most new cars have them and adjust timing to what the ecu "hears" from the motor
That might be the case for cadillac,infinity etc...... that recommend higher octane fuel from factory cause they are actually tuned to run it. If you run lower octane in those they will pull timing to reduce pinging. I highly doubt your Mirage came with a little sticker on the gas door that says run 91 octane lol If it's pinging with 87 then get it fixed. That's what warranty is for.
Knock sensors aren't a new thing. Every injected chev I've worked on had 1 or 2, I'm pretty sure even some late model carbed v8's came with one too.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)