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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old Yesterday, 10:48 AM
turnerg1 turnerg1 is offline
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Location: Georgia
 
Join Date: May 2013
Posts: 37
Mein Auto: 330CI
interesting new idle issue

So the other day I was thinking I wanted to clean my disa and ICV just to have some spring cleaning.
I was part way into pulling things out, had not got to undo the disa yet and I needed to go someplace.
I put everything back together, I had only pulled the intake filter box out. 2 things I noticed going back together was 1 the disa plug seemed loose. and 2 when I was putting the intake box back on my finger was inside the maf sensor area and something cracked or what sounded like a piece of plastic breaking.
I checked it out but didn't see anything broken. I should say that quite some time back I had accidentally broken the plastic protective cover off when doing some other work. Clumsy? maybe.
As soon as I started the car, the RPMs surged well over 1000 and seemed to surge there for a few seconds. SES light came on immediately. car runs smoothly nonetheless.
Ive since pulled the intake box back off to look at the sensor and don't notice anything amiss so Im wondering what could be causing the surging idle with the SES.
When I start the car when its warm it doesn't happen. Only the first start when cool.
I tried to have the codes read at the local autozone but they kept getting a communication error on their reader.
2004 330ci.

Thanks,

Greg
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  #2  
Old Yesterday, 11:55 AM
floydarogers's Avatar
floydarogers floydarogers is offline
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Location: Renton, WA
 
Join Date: Oct 2010
Posts: 4,070
Mein Auto: 335d, 328d, Toyota T100
I believe that there is a temperature sensor in the MAF assembly that is used on starts for air intake temperature considerations (choke.)
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  #3  
Old Yesterday, 08:06 PM
forzam forzam is offline
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Location: east coast
 
Join Date: Mar 2007
Posts: 301
Mein Auto: 04 325Ci
Get a scanner for your phone. I recommend getting an ELM327 wireless from ebay and then OBD Fusion (iOS) or Torque (android). $25 total.

Sounds like you did something bad to the MAF, but that might be a coincidence. Have you tried unplugging it?
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  #4  
Old Today, 03:31 AM
turnerg1 turnerg1 is offline
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Location: Georgia
 
Join Date: May 2013
Posts: 37
Mein Auto: 330CI
Quote:
Originally Posted by forzam View Post
Get a scanner for your phone. I recommend getting an ELM327 wireless from ebay and then OBD Fusion (iOS) or Torque (android). $25 total.

Sounds like you did something bad to the MAF, but that might be a coincidence. Have you tried unplugging it?
Thanks for the input. Ive been meaning to get a code reader for a while now since for whatever reason on this car, the SES will come on depending which way the wind blows. Then go back off in the standard couple miles couple starts cycle.
This SES though I know came on with the first start idle issue.
I haven't unplugged the maf yet because its not running bad, maybe rich as I can smell the gas. The only time there is an idle surge is during the first cold start of the day. After that, all good.

Greg
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