i drove 15 mins of rough driving but the car was laggin because i have a kncok sensor code anyways i took the oil cap off and i am sure i smelled gas...and i have horrible mpg...

 

change the KS. You smell gas in the crankcase? pull for codes. bad o2 sensor can leave a gassy smell.

 

i smell gas from the cap of the oil. and i have lean rich right bank but that was one about a year ago and i only have knock sensor code

 

when did you last check to make sure the only code you have is KS?

How was it a rough drive? did you have bad acceleration? rough idle at lights? if you just had bad acceleration and was giving more gas to compensate it could contribute to why you smell gas when you poped the hood, but if you for sure only smell gas comming from you crankcase (where the oil is) thats a problem.

 

awww man i won't be able to sleep now ...when you drive hard do u ever see like light white smoke come out of the oil after you take off the cap?? i am prretty sure i smell gas but the car drives and start fine......Oh could it be i was flooring it 90% of the 15 minutes?....i just checked my codes and its only kncok sensor....

 

Why are you testing the limits of your car when it is not even up to stock level?

 

Just make sure you keep driving it like that, you're car will be fine.

 

sounds like your dumpin to much fuel because of the bad ks and flooring it 90% of the time. fuel is probably washing down the cylinders and mixing with the oil in the crancase, which would make your oil like pis$ and might blow-by the rings and burn = white smoke....
if your gonna keep driving like that with a bad ks or other problems, start lookin for a motor now !!!!

 

change out the ks reset the ecu. you should be fine. check the online nissan stores they should have one for a good price (around $90 shipped)

 

change the oil asap ....and maybe wash MDezzy's car !!!!

 

she sure needs a wash, but its raining here in GA.

Good luck with the car randy, a 1' long extension, universal swivel head, and ratching will make changing the KS a 5-10 min job. Took my 6 mins first try.

 

i should wash his car for all the advice he helped me with

 

i should wash his car for all the advice he gave me

 

hey i was only flooring it for about 15 mins and i don't remeber when was the last time i floored it, what do you mean make the oil like ****?, i just changed my oil and its already dark color from only 20 miles, would the knock sensor cause the overdumed fuel and the smell? and i only burn white smoke when its cold outsdie or damp, and i so does other cars....otherwise i see the fumes to be ok and last year i passed inspection without good results

 

For all those people with ks code, can you drive your car normally and then pull over and smell the cap and tell me what it smells like?

 

even with a bad KS you should not smell gas from your oil.

just glad to offer some help

 

ok now i realize the smell is like a minuite after the car stops......i smell my dads caravan and his smelled the same

 

oil will always smell like gas after it's been used awhile because gas comes from oil. after exposure to wear and heat of the engine, slight gas fumes will occur as the oil is basically slowly burned. since the oil is never changed 100% due to some oil remaining in the pan and other areas in the engine, it may appear to get dark fast from mixing with the old stuff......(like pis$) when the oil is really thin from over wear, running hotter than usual , extended hard driving or worn engine components.
maybe i misunderstood at first when you said smelled like gas, thinking you meant more than normal.

 

thanks so much i needed to hear that, i can go to sleep now..lol, the smell comes from the cap more than the mouth of the engine....my engine have 70k miles should i do a flush?

 

if you think it could use a flush, it would'nt do any harm. mine has 180k and the oil and internals seem very clean. maybe just do a quick change, oil and fiter and drive a few miles to mix things up a bit and re-change both.