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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 11-24-2012, 09:46 PM   #1
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Join Date: Nov 2012
Location: Ottawa Canada
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My Ride: 325 Xi, 128 coupe
Cleaning the engine intake

Probably not news to long time BMW owners, but there are considerable advantages to keeping the engine intake clean.
I added a 2004 325xi to my BMW collection a couple of weeks ago and was a little disappointed in the low speed engine performance, it seemed "guttless" in comparison to the 128. When I started to notice an instability in the idle speed, I found that the conventional advice is to clean the idle speed controller. So I started taking things off and cleaning them, I found a crack in a breather pipe and lots of muck in the manifold, idle speed controller and the big square valve that plugs into the intake manifold. The engine performs much better now, I can (and do) usually start in second gear and the gear shifts are cleaner. Idle speed is now stable without fear of stalling. It may never have been cleaned in it's 210,000 km life.
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Old 11-24-2012, 09:51 PM   #2
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Suggest you read the first link below in my signature as it may be helpful.
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
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Old 11-24-2012, 09:59 PM   #3
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You start in 2nd gear? In the snow, I understand that, but if you're stopped, you should use first or you'll be wearing out your clutch a lot sooner.

If you're rolling slowly and on a flat, I've dropped into 2nd, but never from a stop.
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Old 11-24-2012, 10:43 PM   #4
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2nd starts pull the b1tches.
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Old 11-26-2012, 06:52 PM   #5
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My Ride: 325 Xi, 128 coupe
I think My 325 Xi must have been fitted with the heavy duty trailer towing package !!!
1st is very low and even 5 only gets me to 65 mph at 3,000 rpm.
Setting off in 2nd, unless on a hill or in heavy traffic, does not need excessive clutch slipping.
My 128 has more sensible gearing and I use 1st, also my diesel Land Rover needs 1st.
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Old 11-26-2012, 07:04 PM   #6
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No towing package.
Please stop starting in second gear,or get ready for a clutch replacement.

Clear your adaptatioj values and reset vanos adaptation. Go for a drive and thatnk me for telling you this.

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idle control valve, intake manifold

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