car is running RICH like a mofo

[nwe30]

quick question, what are the main leading causes of a car running rich?
got a nv m50 here and the smell of fuel is overwhelming.

is the only thing that needs to be replaced an o2 sensor? any way to check if there is in fact something wrong with the o2 sensor?

[ck_taft325is]

What's your average gas mileage?

[Wh33lhop]

If your car smells like unburnt fuel, you may have a fuel leak... running rich doesn't really have the same odor as fuel smell unless you are catless maybe.

[nwe30]

~15mpg.... it has a 4.10 lsd btw.

[ck_taft325is]

On what transmission?!

15mpg is very, very low unless you're raping it 24/7 everytime you drive it.

[Dj Buttchug]

any vac leaks? unmetered air will cause a rich condition

[nwe30]

getrag 260 im sure. i'll text pierre and ask him.

idk what's wrong!! im not raping it at all. i actually tried driving more eco-friendly. the gas tank is 16 gallons right? yeah..im getting 230-240 miles per tank

[nwe30]

any vac leaks? unmetered air will cause a rich condition

no vacuum leaks that i know of. car idles perfectly fine, so there has to be no leak

[DrJosh]

Is it possible for a bad 02 sensor to cause terrible gas milage? I know it can on OBD2 cars.

[Adrian_Visser]

...Uh yeah. Sure is.

[AndrewBird]

any vac leaks? unmetered air will cause a rich condition

Wrong. Unmetered air causes a lean condition, due to there being extra air (less fuel) then the computer thinks there is.

Leaky injectors could cause problems as well. I'd start with the O2 sensor though. You can test it with an ohm meter.

[nwe30]

Wrong. Unmetered air causes a lean condition, due to there being extra air (less fuel) then the computer thinks there is.

Leaky injectors could cause problems as well. I'd start with the O2 sensor though. You can test it with an ohm meter.

oops, i should fix my title then. its running rich because the smell of fuel enters the cabin of my car when im accelerating aggressively. im getting such bad gas mileage it's hurting my wallet...

i really need to pinpoint the problem soon!

where can i find the oxygen sensor?

[Eecen]

where can i find the oxygen sensor?

'eh? It's screwed into your exhaust somewhere after the headers.





And if you're smelling raw gas inside the car while driving..well I'd stop driving it until you find your issue.

[nwe30]

'eh? It's screwed into your exhaust somewhere after the headers.





And if you're smelling raw gas inside the car while driving..well I'd stop driving it until you find your issue.

so i should look into the exhaust system ie headers/exhaust in the engine bay? or do i need to get under the car?

well...it only smells like fuel when i really stomp on it.

[Adrian_Visser]

Well it could be your O2 sensor or its wiring, it could also be the coolant temp sensor or a leaky injector. Nice editing of the OP too lol.