E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Thread Tools Search this Thread Rate Thread Display Modes
Old 10-27-2015, 01:28 PM   #1
Registered User
Join Date: Aug 2015
Location: United States
Posts: 24
My Ride: 2004 BMW 330CI
P0102 Code and popping noise

Hey everyone,

In my quest to rid myself of my lean code, i decided to take apart the intake hoses down to the throttle body to check for any vacuum leaks behind the engine. I did not find any so put the car back together, and started it only to find I had a very rough idle and a popping noise under the engine as well as a p0102 code (I had none of this before taking apart the car). I realized I forgot to plug the MAF back in, so i plugged it in and still got the same problems. Took everything apart against thinking i forgot to do something but all seemed good. I also bought a new MAF, as I was already going to do this as a next attempt to solve my lean code (i have done EVERYTHING else), but this rough idle and noise is still there.

I cleared the codes and drove 20 miles after installing the new MAF with no codes so far, and unfortunately I dont have much time to drive more this week to see if this come back. If it does not come back, i figure I somehow created a leak somewhere, while if it does, I assume its MAF/wiring related but idk.

Here is the exact sound I found in video:

Strangely, when i press the clutch, this noise goes away but the idle is still awful. I have a hard time believing something suddenly went wrong with my clutch, so I am ruling that out for now.

If anyone has any experience of idea as why this is happening, any input would be appreciated.

Thank you
46Boss is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 10-27-2015, 02:37 PM   #2
Registered User
Join Date: Aug 2015
Location: United States
Posts: 24
My Ride: 2004 BMW 330CI
After driving it for 30 miles, the p0102 code has not come back, just my lovely lean codes. These codes came up MUCH quicker than they normally do. I am pretty sure I ripped something when taking the car apart, now to look for where the rip is.... :/

Still dont know where that sound is coming from, seems somewhere near throttle body though.
46Boss is offline   Reply With Quote
Old 10-27-2015, 03:42 PM   #3
Registered User
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 17,481
My Ride: 330CiC, M5, X5
I doubt you removed the lower intake boot.

If you did, it should be replaced.

The ICV may not be fully seated as well.

Smoke testing is the easiest way to find vacuum leaks.

See my comments in this thread - http://forum.e46fanatics.com/showthread.php?p=16727145
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 10-27-2015 at 03:42 PM.
jfoj is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON

All times are GMT -5. The time now is 05:21 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use