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General E46 Forum
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Old 11-03-2015, 05:26 PM   #1
mjb20
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Join Date: Apr 2015
Posts: 11
Rough idle in morning

Having a idle issue in the morning or whenever the car is not used after a few hours. With the weather only getting colder it is getting worse.

My codes are p0411, p0171, & p0174

What basically is happening is when I start the car it idles at about 1k rpms, then after about 20 seconds the rpm start going up and down staying in between 500 and 1000 rpms, after about another 20-30 seconds the rpms shoot up to around 1200-1500 rpms, then idle is fine at around 600rpms.

I had the car smoke tested and had no leaks, replaced the disa, checked the maf, checked idle control valve, the only thing that seems out of ordinary is I can hear the secondary air pump cut on when I first start the car and it sounds loud and not right, could this pump not be working correctly and causing this idle issue?
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Old 11-03-2015, 05:43 PM   #2
jfoj
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Quote:
Originally Posted by mjb20 View Post
Having a idle issue in the morning or whenever the car is not used after a few hours. With the weather only getting colder it is getting worse.

My codes are p0411, p0171, & p0174

What basically is happening is when I start the car it idles at about 1k rpms, then after about 20 seconds the rpm start going up and down staying in between 500 and 1000 rpms, after about another 20-30 seconds the rpms shoot up to around 1200-1500 rpms, then idle is fine at around 600rpms.

I had the car smoke tested and had no leaks, replaced the disa, checked the maf, checked idle control valve, the only thing that seems out of ordinary is I can hear the secondary air pump cut on when I first start the car and it sounds loud and not right, could this pump not be working correctly and causing this idle issue?
Who smoke tested the car???

Your problems are NORMAL for a 10+ year old E46. The SAP has no major impact on cold start performance or Lean codes. It should not be your primary focus at this point.

What OBDII tool or App do you have at this point, if any?

You need to read all of 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
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Old 11-03-2015, 06:01 PM   #3
mjb20
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I had a shop that only works on European or other imports perform the smoke test

I did forget to mention that my car is a 2004 325ci

I don't have an OBDII tool or anything so I was just going off what I was given from multiple part stores and what the car shop gave me and those are the only codes that really stuck out
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Old 11-03-2015, 07:13 PM   #4
jfoj
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OK, you have to start with getting your own OBDII tool/App.

Get an OBDII smart phone/tablet App and interface, typically $30 or less. These Apps are usually best for driveability issues and they support Emission Readiness Monitor Status, Freeze Frame and Live/Realtime data. They are also great for Logging data for review after the car has been driven and can really help find unusual problems. Logging is very helpful for the less technical to pass date on for more advanced users to offer comments.

Android - OBDFusion formerly known as Touch Scan for approximately $5.00 and ELM327 OBDII to Bluetooth interface.

iProduct - OBD Fusion for $9.99 and ELM327 OBDII to Wifi interface.

http://www.amazon.com/gp/product/B01...dp_o_pC_nS_ttl

http://www.amazon.com/gp/product/B00...dp_o_pC_nS_ttl

DISA primary O-ring, CCV lower oil return line, power brake booster are all sources of vacuum leaks.

I HIGHLY suggest you do your own smoke test, see the videos in the link I provided. Did you take the car into the shop for repair or just the smoke test??

The SAP system on your car is a MAF based SAP system. The pump bearings wear out and they can scream, howl and vibrate and can be heard 2-4 house away.
__________________
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 11-03-2015, 10:22 PM   #5
chanman1029
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possibly a CCV, you could have a shop diagnose this by doing pressure tests. I thinks it too much negative vaccum is a bad ccv. my car will need a new one soon
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Old 11-03-2015, 10:50 PM   #6
jfoj
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My Ride: 330CiC, M5, X5
I do not know why anyone spends time "diagnosing" Lean problems on a 10+ year old E46.

The CCV and hoses, intake boots, vacuum lines all should be replaced by the cars 8th birthday without fail if you do not want any headaches. You could possibly push it to the cars 10th birthday, beyond this it should be CRYSTAL CLEAR what needs to be replaced without even opening the hood or experiencing rough idle, cold start problems or Lean codes.

The DISA should be replaced by then as well, but this is pretty easy to remove and inspect, but the large O-ring should be replaced. It is a hack, there is no BMW service part for the 325/330 engines. Valve cover gaskets and grommets should be replaced by then as well.

The power brake boosters are failing around year 12.
__________________
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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