For some time now, the exhaust from my 4th Gen I30 has smelled like raw gasoline whenever I start it...especially when it is cold.

I do not have a fuel leak, so I know it is not that. What else can cause that smell?

Enquiring mind wants to know!

 

Cold starts always cause the car to run rich - it's normal.

Once fully warmed up, the smell should not be there.

What sort of mpg are you getting

And the customary, any ECU codes?

FYI, running rich is determined by the ECTS during open-loop and O2 sensors otherwise.

 

Clogged / non function cat.

 

i have the same problem 96 i30....and my mpg are about 16 without a/c and about 13 with a/c...but i have always noticed that the smell was to strong idk?? any help

 

how are you measuring your mpg?

 

Im not an idiot i dont wait untill i get low and divide......i fill up drive until i get a little less than a quarter tank fill up see how much it takes and divide the best i ever got was ~ 18mpg

 

Are you using a calculator or you doin it in your head

-matt

 

Well you're an exception to the average .org member!

Any ECU codes? check your o2 sensors, ECTS, injectors... 18mpg is LOW.

 

Wow that's pretty low, either you're doing it wrong or you car is f*cked up, even trucks get better mileage than that.

 

Are you serious??? I use a calculater i get about 270 on a full tank

 

Man, that's terrible, you should get at LEAST 300, check your car out.

 

wow some people from Tucson cool where should i go to get it lokked at??

 

Brian Cattman is from Tucson too Go to Autozone for them to check your car for codes for free.

 

My air filter is clean i get the oil changed every 2500 miles??? should i check for codes and where can i get it done i spend way too much money on gas...

 

I told you, go to Autozone, they check for codes FREE! There's one on Prince and Fairview, 1st and Glenn, and Silverbell and Speedway.

 

Thanks a lot man...i just got back from the ina/thornydale location and the only thing that came up was the knock sensor....they said that "it was a warning that a piston might blow" and that it didnt affetct mpg??? any ideas??

 

That's why you ALWAYS trust what you hear from Autozone and other parts stores. Those guys are friggin' geniuses. I don't know how they do it.

...

ummmm no ... replace the knock sensor (80-100 bucks on ebay for the part), 10 mins of your time- see stickies. That will help increase your mpg by 10-15%... the autzone guys are talking out of their a.ss

 

nice to know the person seemed like an idiot i handed him my key and said make sure you turn the volume on my deck down... alpine the volume gradually increases to the previous setting anyway next thing i know the idiot turns on the car plugs it in to my comp and the volume starts going up and he dropped the tester and backed up and i had to reach over and turn it down.

 

But is anything wrong he said that it ment a piston might blow soon true or b.s.

 

him

 

i thought 270 to a full tank was normal... and thats when i get lucky

 

Here we go again... define full tank.

 

I know that is when im lucky it sucks....but i do know how to track mpg fill up fill up again divide miles by how much gas it took.

 

Get a new knock sensor put it in and call it a day.

 

Get your car checked too 270 a tank is horrible. I get about 350/tank all city.

 

wow, u guys are so lucky hitting over 250 in all city.....
everyone else > mine
and ive done all maintenance and everything, theres nothing left to do!!!

 

My friend, check your fuel injector seals. One of them is most likely leaking. key on the ignition a few times and build up fuel pressure. Then wait a few mins and go smell around the fuel rail. I had an injector leak and I went nuts trying to find the source of fuel odor.. finally it was right there.

 

your gold tooth adds too much weight to the car you should get rid of it and that should help out with the mpg.

But yah either you have a lead foot on the pedal or I just baby my car cause I get around 375city and around 430 highway on a full tank.

 

FINALLY! Some answers to my question instead of going on a tangent about gas mileage (which has been beaten to death elsewhere). Besides, trying to compare one's gas mileage with another is like trying to comare one person's definition of pain to another -- it's all relative. When you sit in bumper-to-bumper traffic every morning and every afternoon, your gas mileage will not be too swift.

Leaky fuel injector makes sense (it was on my list of possibles).

Njmodi: the gas smell is always there when I start it up, even after the car is warm.

I get around 17-18 mpg city, which is mostly do to my lead foot..but, it is a no-brainer that my mileage would be better if I did not have that smell...right?

No ECU codes have popped up, either.

No codes, no pings, and the car accelerates just fine, which sort of casts doubt on it being a bad knock sensor.

There are a lot of things that affect gas mileage, like bad O2 sensors, but not that many things cause a gassy exhaust.

If I had a way to get my exhaust tested, that would help.

OK, folks. Back on task here...

 

If you don't already, try premium gas and see if that helps your mileage.

 

After experimenting with using lower grades last year, I have been using only good grades of premium like Chevron, BP, and Shell.