[Delta0311]

I notice that this only happens when the car is first started on a freezing morning. Car starts fine but the RPMs go to about 1K then instantly drop to about 500, as the RPMs drop the car feels like its about to stall(it does not shake or anything like that). Then a second later RPMs shoot back to 1k and everything is fine again. I scanned for codes and the car did not show any. Car has 30k miles and HPFP was replaced in December. Again this only seems to happen first thing in the AM when the temp is below 25F.

[JETmn]

My car goes in next Tuesday for this issue. Mine starts at 1k, drops to 600rpm, then shoots to 1500rpm and drops back to 1k and sits there for a bit. I actually had it die on me a handful of times too. It wasn't able to catch itself when the RPM dropped the first time and died. I have new plugs installed and hopefully the dealership tries something else this time. I will know more next Wed.

[chrisk03]

Is your "snowflake" (A/C compressor) on when you start the car? I sometimes get idle issues on start-up similar to what you describe when it is on. Car has never stalled out on me though and it seems to correct itself after maybe 30 secs to a minute. Not sure if related, but figured I throw it out there to you.

[Delta0311]

Originally Posted by chrisk03

Is your "snowflake" (A/C compressor) on when you start the car? I sometimes get idle issues on start-up similar to what you describe when it is on. Car has never stalled out on me though and it seems to correct itself after maybe 30 secs to a minute. Not sure if related, but figured I throw it out there to you.

Yeah I checked that but no the AC is never on when I start the car in the AM. Especially since it like between 15F-30F around here.

[tke344]

I brought my car in for the same thing about 2 weeks ago. One morning when it was close to 0 deg F outside the car actually stalled after a very long, very weak crank. Then again when I restarted the car.. Ended up giving it a little throttle to keep the RPMs up for maybe 30 seconds until it stabilized.

The dealer did a software update, I believe it had a revision date of December 2013 so unless I read the paperwork incorrectly, it's very new. I can't say for sure if it fixed anything, it hasn't been quite as cold out lately. My issue may be a combination - software and a dying HPFP, but so far it hasn't stalled again.

[Sidewinderpb]

Mine does the same thing, but it does die...every morning. I have to rev it a few times when i start it every morning so that it doesn't die.

[Delta0311]

Originally Posted by tke344

I brought my car in for the same thing about 2 weeks ago. One morning when it was close to 0 deg F outside the car actually stalled after a very long, very weak crank. Then again when I restarted the car.. Ended up giving it a little throttle to keep the RPMs up for maybe 30 seconds until it stabilized.

The dealer did a software update, I believe it had a revision date of December 2013 so unless I read the paperwork incorrectly, it's very new. I can't say for sure if it fixed anything, it hasn't been quite as cold out lately. My issue may be a combination - software and a dying HPFP, but so far it hasn't stalled again.

I would say the software update might help because in my case the HPFP is brand new.

[Sidewinderpb]

Do you have a JB4? I just spoke with Terry about my similar issue, and he suggested installing the FlexFuel wires and setting FUE=20.

Also mentioned here:
http://www.n54tech.com/forums/showth...=17800&page=14

I ordered them, so I'll report back once I get them set up.

[Delta0311]

Originally Posted by Sidewinderpb

Do you have a JB4? I just spoke with Terry about my similar issue, and he suggested installing the FlexFuel wires and setting FUE=20.

Also mentioned here:
http://www.n54tech.com/forums/showth...=17800&page=14

I ordered them, so I'll report back once I get them set up.

No I do not. Bone stock as far as mods go.

[Sidewinderpb]

Ah well that that does not apply.

From what I've read, it's likely your spark plugs or fuel pump.

However, my issue began when my dealer updated my software while I was having my water pump warrantied 2 weeks ago. Perhaps some correlation?

[Delta0311]

Originally Posted by Sidewinderpb

Ah well that that does not apply.

From what I've read, it's likely your spark plugs or fuel pump.

However, my issue began when my dealer updated my software while I was having my water pump warrantied 2 weeks ago. Perhaps some correlation?

I had my fuel pump replaced in December. I'm also thinking that it might be some kind of misfire. I took some videos of the cold start and I'm going to the dealer next Friday.

And let me make one slight correction:
Right after start the RPMS go to 1k then drop to 600 and then shoot up to 1.5K, then they fall back down to around 1k and then slowly decent back to 600(like in a normal start).

[Sidewinderpb]

Check out these guys' experiences. It might pertain to your car.

http://www.e90post.com/forums/showthread.php?t=600473

[JETmn]

I just got the software update done yesterday and the startup was very solid this morning. Usually the RPM varies quite a bit, but it came up to 1.1k and just sat there. The real test will be tonight when I leave work as it will be -5* out. Reprogram was free as it is for emissions. I am pretty positive they made the DME much more reactive on startup so the car will pass emissions with the carbon buildup on the valves. I am pretty positive that is what the real problem is, but they have covered it up well.

[Delta0311]

Originally Posted by JETmn

I just got the software update done yesterday and the startup was very solid this morning. Usually the RPM varies quite a bit, but it came up to 1.1k and just sat there. The real test will be tonight when I leave work as it will be -5* out. Reprogram was free as it is for emissions. I am pretty positive they made the DME much more reactive on startup so the car will pass emissions with the carbon buildup on the valves. I am pretty positive that is what the real problem is, but they have covered it up well.

LOL I was just about to post something similar. I was at the dealer for a blown water pump at 30k miles this Monday. I got the car back yesterday with a new pump and they also did a software flash for my idle issue.

[Sidewinderpb]

Originally Posted by Delta0311

LOL I was just about to post something similar. I was at the dealer for a blow water pump at 30k miles this Monday. I got the car back yesterday with a new pump and they also did a software flash for my idle issue.

Just had the same two things done. Too bad it didn't fix my idle

[Delta0311]

Originally Posted by Sidewinderpb

Just had the same two things done. Too bad it didn't fix my idle

Did they check your valves for carbon buildup?

[Sidewinderpb]

Originally Posted by Delta0311

Did they check your valves for carbon buildup?

I highly doubt it. That's not a bad idea though, seeing a how I'm at 44,000 miles.

[JETmn]

My dealer seems to always just piss in the wind and do the simplest thing that may possibly fix the issue. Spark plugs last time (it was due at 50k anyway) and this time the DME update. I know the DME update is just a bandaid for another problem, like carbon buildup as I have 54k on it. I just got my OCC so I will probably be doing the carbon cleaning this summer if I can't get the dealer to do it.

[JETmn]

Alright, startup in cold weather is different than before, but still not fixed. I started the car up at -2* temps and it never got close to stalling, but RPM was surging between 900 and 1200 very quickly for 15 seconds. Sounded like a POS Honda with a bad tune. NOT what I expect from a car costing this much. A damn Kia doesn't do this on startup, come on BMW!

[Sidewinderpb]

At least you don't have to wake up the neighborhood by revving a catless cold start.

[Delta0311]

Originally Posted by JETmn

Alright, startup in cold weather is different than before, but still not fixed. I started the car up at -2* temps and it never got close to stalling, but RPM was surging between 900 and 1200 very quickly for 15 seconds. Sounded like a POS Honda with a bad tune. NOT what I expect from a car costing this much. A damn Kia doesn't do this on startup, come on BMW!

Date: 2/28/2014
Time: 0620
Temp: 8F
Started car, RPMs went up to 1100 and then instantly dropped to 0 which caused the start to shut off. Fired it up again and everything was good to go. This thing is going back to BMW next week.

[nynyny]

Originally Posted by Delta0311

Date: 2/28/2014
Time: 0620
Temp: 8F
Started car, RPMs went up to 1100 and then instantly dropped to 0 which caused the start to shut off. Fired it up again and everything was good to go. This thing is going back to BMW next week.

That's exactly what happened to me this morning.

9 degrees. Start it up, goes to 1100 like normal, then just poops out and shuts off. Had to goose the gas on the seconds start up to prevent it stalling again.