Poor MPG
12-08-2014, 08:48 PM
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Poor MPG
Curious, what city MPG are you guys with force induction 3L+ seeing?
My Air/Fuel ratios haven't changed any, but MPGs are half what they used to be. No changes have been made.
What are the things I should look into that could cause this? Bad wideband 02 sensor?
Thanks,
My Air/Fuel ratios haven't changed any, but MPGs are half what they used to be. No changes have been made.
What are the things I should look into that could cause this? Bad wideband 02 sensor?
Thanks,
12-09-2014, 08:08 PM
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Next step may be switching out the o2 sensor to see if that changes things. The A/F ratios haven't changed any, is that because the computer is interpreting more air from a leak, or bad o2 sensor and making the adjustments(dumping more fuel) and displaying normal A/F ratios?
12-09-2014, 08:29 PM
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I've never done a true plug chop, but the plugs have around 2,000 miles on them.
Here is how they all look....
12-09-2014, 09:36 PM
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I'll explain...
I read your suggestion about the tire pressure and thought to myself,
"Sure, why not. I'm open to all suggestions. Truth be told, it was warmer outside last time I checked them"
Well, I grab the gauge and the results? .... 17 and 18 psi in the fronts, and 22 and 23 psi in the rears.
Soooo, yeaaaaaa let this be a free lesson to all...
The temperature's dropping out there, it's a good idea to check your tire pressure! They are probably low.
I do wonder though if this is still just part of the issue and not the whole problem as I wish it were.
If I was previously seeing ~16-17mpg city, would my low tire pressure drop it as low as ~8mpg?
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12-09-2014, 11:29 PM
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Yes it has a locking style gas cap, but the PO never had the key cylinder in it. So currently a non-locking...locking style gas cap.
The more I look into it, the more it directs me to the wideband O2 needing to be replaced.
As far as the history on the sensor goes, It's the same one that was on the car when I bought it in March 2012.
Since then I rebuilt the engine in June 2013 and have been using high ZDDP oil since. Used Joe Gibbs break-in oil and then been using Brad Penn as the routine oil.
The more I look into it, the more it directs me to the wideband O2 needing to be replaced.
As far as the history on the sensor goes, It's the same one that was on the car when I bought it in March 2012.
Since then I rebuilt the engine in June 2013 and have been using high ZDDP oil since. Used Joe Gibbs break-in oil and then been using Brad Penn as the routine oil.