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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 03-21-2012, 12:01 AM   #1
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Join Date: Jan 2009
Location: socal
Posts: 163
My Ride: 00 BMW 323CI Coupe
I got problems...

Hey guys,
My SES light has been on for a while now and I'm working on the funds to get it fixed. My problem is that when my car sits at idle, usually at a red light or a drive-thru, the car goes on an idle hunt and sometimes stalls. I try to stop this problem by giving it a little gas, but if the car sit too long in idle it loses a sufficient amount of power. When I press the gas, I lose about 50% of the acceleration.

The e46f member that scanned this for me suggest that I get the pre-oxygen sensors replaced and then run a smoke test to check for vacuum leaks.

My question is for members who experienced similar problem like I described, How did you guys get it fixed? Also with the results I showed from the scan. What do you guys suggest I get replaced? What's wrong with my car?!?!

I got it scanned and here are the results

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Old 03-21-2012, 12:34 AM   #2
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Join Date: Aug 2010
Location: calhoun, Ga
Posts: 56
My Ride: 2003 325i
Possibly your fuel pump going bad, my car did this as well with similar codes. I replaced fuel filter and pump and problem went away
2003 325i sedan K&N INTAKE, ebay headers, REMUS EXHAUST, depo hid headlights with angel eyes, EAGLE EYE LED TAIL LIGHTS, vmr csl replica wheels 18" BFGOODRICH GFORCE 225/40/ZR18
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Old 03-21-2012, 12:37 AM   #3
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Join Date: Feb 2006
Location: Vancouver Canada
Posts: 1,991
My Ride: e46 323ci
must be some sort of vacuum leaks.

I would start from checking #4 in below picture and go from there.

Also check below,
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Old 03-21-2012, 04:01 AM   #4
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Join Date: Aug 2006
Location: NJ
Posts: 23,702
My Ride: '99 328i 300K miles
Search 'idle surging' in the thread title. There's a long thread about it--NicB

I fixed mine...probably 99% of the solution was cleaning icv...maybe TB. I replaced the tb gasket, icv grommet, disa o-ring, lower intake boot, cleaned maf...but I think it was the icv...which was horribly gunked up. I used a can and a half of cleaner to clean it. Been good for at least a couple of years now.
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