bad o2 sensor placement causing bad gas mileage?

[jwahl16]

i have had reallly bad gas mileage since i installd my 16g and o2 housing. (11 mpgs). the o2 threads were at like an angle so the o2 sensor pressed up against the side of the housing when i screwed it in. i dont have a check engine but would that cause me running rich and have bad mpgs? my exhaust smells bad like its running rich.

thanks

 

[erickk mf]

could be.. do you have a piggy back system or anything ecu modded?

 

[jwahl16]

no here are my mods:
big 16 g turbo
dejon hard ic piping
injen intake
3" o2 housing
1g bov recirculated

no tuning has been done. i think the mpgs were around 16 before i put on the o2 housing.

 

[jwahl16]

so what do you think? Is there any way to test it? Thanks.

 

[innocenttalon]

O2 Sensor FAQ This site shows how it works and how to test the sensor. Boost leak can also cause you to run rich, thus bad gas mileage. Do a boost leak test.

 

[DSM1G90]

Ya, if the OX sensor is gone, the system goes into rich mode since the ECU thinks that the exhaust is running lean and will make the injectors shoot more fuel in the system.

 

[jwahl16]

thanks, i really need to find my boost leaks (i have about 14 vac in drive and 15-17 while in park). For some reason i have been struggling to make a boost leak tester properly, . I'll take another crack at it when this snow melts.

 

[JayRolla]

If the o2 was damaged it would put you in limp mode meaning you would through a CEL. Im guessing you have some other issue if no CEL is present.

 

[dontfeedphils]

You def have something way wrong if you're only getting around 11 mpg, I have a ton done to my car and still daily drive it getting about 22 mpg.

 

[jwahl16]

yeah, boost leak is first on my list, i'll report back afterwards