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Old 01-31-2017, 11:23 PM   #10 (permalink)
ksa8907
Master EcoModder
 
Join Date: May 2012
Location: Tampa, FL
Posts: 1,745

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
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Quote:
Originally Posted by slowmover View Post
10% drop is reason for investigation. This rule was old when I first heard it in 1970s. Fuel and air filters first back then. Next was spark plugs and points. These were after tire related.
Its really odd, ever since i got the car it would ping with regular gas and then feel like a monster (for what it is) on premium. Now lately, the last couple months, it hasn't been pinging on regular and holds gear with much more throttle input.

I know there is something wrong since one side of the engine injects about 10% more fuel, the o2 sensors and cat temperature confirms this. But i dont know if it is the o2 sensors or the timing chain stretched.

I found out i have wideband o2 sensors stock, how do i view the afr?
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