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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Apr-30-2012, 07:06:17 PM   #31
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Bump, I've done everything OP has + fuel pump, fuel filter, plugs, and many other things.

Still have idle drop
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Old Mon, May-14-2012, 12:45:58 AM   #32
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Default Re: Idle Drop Issue..

Here's a very interesting development. I leave my air conditioning on, rain or shine, winter or summer, and today I was taking my nephew for a ride and his feet were getting cold, so I shut off the air conditioning, first time in a long time. Almost immediately my idle drop issue got worse, and got progressively worse to the point where it was trying to quit on me. I could only keep it alive at stop signs by adding gas while I had my foot down on the clutch pedal.

When I got back I took it for a ride again, this time with the air conditioning on, and the problem went away. When I turned the air conditioning off again the problem returned in a couple minutes.

So my idle drop issue appears to be connected to the air conditioning. And it figures, as in the mornings when I drive the car its cold and the air conditioning is rarely running, and my idle drop issues seem to be worse then.

So someone explain to me how my air conditioning is connected to my idle drop issue.
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Old Mon, May-14-2012, 02:16:50 AM   #33
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Default Re: Idle Drop Issue..

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Originally Posted by Wengy View Post
Here's a very interesting development. I leave my air conditioning on, rain or shine, winter or summer, and today I was taking my nephew for a ride and his feet were getting cold, so I shut off the air conditioning, first time in a long time. Almost immediately my idle drop issue got worse, and got progressively worse to the point where it was trying to quit on me. I could only keep it alive at stop signs by adding gas while I had my foot down on the clutch pedal.

When I got back I took it for a ride again, this time with the air conditioning on, and the problem went away. When I turned the air conditioning off again the problem returned in a couple minutes.

So my idle drop issue appears to be connected to the air conditioning. And it figures, as in the mornings when I drive the car its cold and the air conditioning is rarely running, and my idle drop issues seem to be worse then.

So someone explain to me how my air conditioning is connected to my idle drop issue.
My air conditioning affects my idle drop issue as well.
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Old Mon, May-14-2012, 05:27:28 AM   #34
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Default Re: Idle Drop Issue..

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So someone explain to me how my air conditioning is connected to my idle drop issue.
Typically when turning the AC on the ECU tells the ICV to speed the idle up by 50 or 100 RPM. I think that's in the AutoEnginuity readout also as a function that you can trigger with the diagnostics tool.
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Old Mon, May-14-2012, 05:49:17 AM   #35
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Default Re: Idle Drop Issue..

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Originally Posted by Wengy View Post
So someone explain to me how my air conditioning is connected to my idle drop issue.
I have the exact OPPOSITE issue. Without the AC on my idle is fine, with the AC on the idle drop occurs consistently.
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Old Mon, May-14-2012, 06:23:24 AM   #36
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Default Re: Idle Drop Issue..

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I have the exact OPPOSITE issue. Without the AC on my idle is fine, with the AC on the idle drop occurs consistently.
Yep, same for me.. At a stop, my ac causes an idle drop of about 400rpm, in addition to a nice "rumble" throughout the car. It's funny, my e36 m3 had the same issue and I never could resolve that one, either.
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Old Mon, May-14-2012, 04:00:08 PM   #37
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Default Re: Idle Drop Issue..

My car also has this issue... 2006 M3 6MT... and it's worse when the A/C is switched off or on, then I believe it goes away.

I notice the idle drop much more often when cold, as other replies have stated too
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Old Mon, May-14-2012, 04:37:23 PM   #38
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Default Re: Idle Drop Issue..

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Originally Posted by deilenberger View Post
Typically when turning the AC on the ECU tells the ICV to speed the idle up by 50 or 100 RPM. I think that's in the AutoEnginuity readout also as a function that you can trigger with the diagnostics tool.
Deilenberger. Have you got any advice on what the issue may be, in my case? Having the AC on doesn't make my idle drop issue disappear, but its certainly less severe and less frequent then when I have my AC turned off.

My car hasn't had any special tunes or modifications. It's a vanilla M3 convertible, 2001, with only 56,000kms on the clock. It's well looked after.

Has anyone got any ideas or recommendations on what I should look at?
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Old Mon, May-14-2012, 07:25:10 PM   #39
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Default Re: Idle Drop Issue..

Without studying the ETM, this is just a WAG. If you could spoof the signal the ZFE (body module) sends to the ECU when the AC compressor is on - so it thinks it's on all the time, that would up your idle a bit.

Someplace I vaguely remember some reprogramming being available to simply up the idle RPM - I believe the dealer may be able to do this... but that's from the dark recesses of my memory so it could be entirely imaginary.
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Old Mon, May-14-2012, 07:30:06 PM   #40
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Default Re: Idle Drop Issue..

This is not a problem the car used to have. It started about 2 years after I bought it. If it was a problem with the computer or software, my sense is the problem would be more consistent, no? I mean do ECU's degrade over time? My sense about computers is the work until they don't anymore, and when they fail they stay broken.

Is there any wear and tear on components that might explain the problem? Perhaps the MAF or ICV?
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Discussing Idle Drop Issue.. in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)