brand new to forum, preowned 3 series - BMW Forum

Casey Mastro · 05-24-2010, 07:30 PM

hello. i own a 2002 330Xi and am having problems with the fuel system. the check engine light has been on for one month, and when i stopped by the local autozone to plug it into their computer, the codes stated the fuel mixture was not correct (which i knew because the car was jerky). now there is a high pitch when i depress the accelerator. it's faint but i can hear it and it drives me crazy. can i fix this myself? i would love some info. thanks everyone.

casey in ithaca

ps. i should mention the car has sat for two years until March of 2010 (in case it means anything)

brettski · 05-25-2010, 07:23 AM

Welcome to the Werkz

It could be a vacuum leak, which will throw out your air fuel mix (lean). See if you can isolate the sound whilst the car is idle and hopefully it should be an easy fix. Good luck

Casey Mastro · 05-25-2010, 03:11 PM

where would the vacuum leak be? or rather, where should i start looking?

04efi · 05-31-2010, 04:14 AM

My service engine light came on yesterday, and I took it to autozone. They said car is running lean and it may be an 02 sensor but it wasn't telling them for sure. I did notice a high pitch whistle at certain speeds as well and some jerky acceleration from 60 to 80MPH. I'm curious where this leak may be, anyone have a suggestion on this?

denyo77 · 05-31-2010, 07:26 AM

why has the car sat for 2 yrs? That's quite unusual for such a new car.

Dugger · 08-18-2011, 01:45 AM

Casey...what ever happened with this issue? I have the same thing with our 2001 330xi. Frustrating to say the least. Thanks for the help.

jimmythepie · 08-18-2011, 05:15 PM

uh!time warp or what?

phillybimmer01 · 08-18-2011, 06:43 PM

Hey I have a 330xi as well and had the same problem.The intake boots and the disa valve was the problem on mines.Had a wierd whistle sound when i accelerated and car would idle funny.Try that.Fast DIY.Got intake boots at dealer for less than 100 bucks and put it in myself hope this helps.

Dugger · 08-19-2011, 12:52 AM

Thanks for the info, I'll have a go at the disa valve. Did your car have any related fault codes during this issue? I've got a few and am trying to sort out if they will point me in the right direction.

phillybimmer01 · 08-19-2011, 11:16 AM

Yea a couple of the codes were as follows:
P0313 Misfire detected with low fuel
P0300 random multiple cylinder misfire
P0174 System too lean bank 2
P0171 systen too lean bank 1
That's wat i got.
Hope it helps.