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O2 Sensor spacer for better MPG

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Old 06-11-2011, 01:24 AM   #1
Martin
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Default O2 Sensor spacer for better MPG

My latest experiment to see if I can increase MPG's is to add a spacer to the O2 sensor. Bought the spacer at Oreilly, it's actually called a Spark Plug Non-Fouler. Had to drill out the spacer for the O2 sensor to fit in.

Just put the spacer in today so I don't have MPG results yet. I have an 4 gas emission machine at my shop and after a 10 mile ECM reset the CO and HC readings dropped in half. The temp jumped about 1 letter higher and seems to have a bit more power. I am keeping an eye on it, I'm a little afraid of leaning it out too much and cooking the motor.

I'll update this as I run some more test miles.
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Old 06-11-2011, 01:41 AM   #2
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I think you're making it run rich like that. That's what they use to fool the rear O2 into thinking the cat is still functional, meaning the sensor doesn't see the rich gases coming out.
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Old 06-11-2011, 02:20 AM   #3
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Sean The Cat fooler is where I got the idea. Wasn't sure how it would work, make it run richer or leaner, but the 4 gas analyzer shows that it leaned it way out. Now I just need to make sure it's not too lean, don't want to cook a valve with my test. It'd be killer if I got 25 mpg .
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Old 06-11-2011, 04:19 AM   #4
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At least you got the right tools for experimentation.
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Old 06-11-2011, 06:52 AM   #5
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Would this spacer gadget be the same thing that is used for a cat delete? Just curious to know what it was that's all. Goodluck with this experiment and keep us updated
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Old 06-11-2011, 06:55 AM   #6
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i think you would just make the truck run too lean and loose some power but you could see some extra miles but not 25mpg it is a truck after all. get a 4 banger mount it in the bed and run the drive shaft to it and there you go 25mpgs sort of like a ford ranger.
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Old 06-11-2011, 08:46 AM   #7
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the o2 sensor on a 1995 should be in front of the cat! how and why would this lean it out!!!ymeski we need you on this one!
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Old 06-11-2011, 12:00 PM   #8
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Quote:
Originally Posted by jimmy wade View Post
the o2 sensor on a 1995 should be in front of the cat! how and why would this lean it out!!!ymeski we need you on this one!
They have one in front and one behind, if I'm not mistaken. The earlier gens (aka my '90) only have one, and it's in front of the cat.
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Old 06-11-2011, 12:26 PM   #9
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Only the '96 has one behind the cat, because it's OBDII.

And yes it's for the cat delete when used behind the cat.
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Old 06-11-2011, 04:42 PM   #10
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Yes my 95 has only one and it's in front of the cat. I deleted my cat long ago, when it seemed to be clogged. Thinking about putting a new Y-pipe on it though and Catco's come with a cat and Bassani's are available in an off road only version.
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