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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!

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Old 10-27-2015, 01:28 PM   #1
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Join Date: Aug 2015
Location: United States
Posts: 19
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
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Old 10-27-2015, 02:37 PM   #2
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Join Date: Aug 2015
Location: United States
Posts: 19
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.
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Old 10-27-2015, 03:42 PM   #3
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,639
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.
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