[GBX]

So, about a month ago i started my car after it was sitting outside in the cold all day and it idled rough as hell. Almost as bad as when my fuel pump went, so i thought it was that. But no CEL (didn't scan though). So, i shut off my car and turned it back on and everything was fine. No problems since then until today when the same thing happened. Any ideas what it could be?

[AlbAtRoS]

thats normal when it does that just shut it down and start it again, make sure you put high octane gas into your N54 engine

[AlpineG05]

hpfp, plugs, or injectors

[hun77777]

if not hpfp, most likely spark plugs. mine were really bad when i initially replaced it after merely 20k and am replacing it every 15k since...

[Mike@N54Tuning.com]

Could be many things. Was it particularly cold those two occasions. Could be a bad plug, bad gas, injectors, coil packs, etc... Until you get a CEL or it gets bad I wouldn't worry to much about it.

Mike

[Quizarate]

It could even just need a software update. My car ran like shit and backfired like crazy on cold starts to the point of almost stalling. Had a software update and the problem went away.

[Wicked_SVT]

I have been having the same problem the last couple of days. On cold start the car idles rough and almost feel like it is missing when applying light throttle. But as the OP stated it has not thrown a code. I just had the number one injector and plug replaced not too long ago. That did throw a code though.

[M_M]

could be your battery as well, mine was going down and I had the rough idle at cold starts. I suggest you check the batt. voltage before starting the car tomorrow morning.

[GBX]

Thanks guys. Bringing in for my second oil change and vehicle inspection next week so i'll see what they say. Hopefully i can push them to check/replace my plugs and/or injector, and maybe update my sw.

[samchoi604]

If you live somewhere with cold temperatures just use Mobil 1 0w-40. Better for cold starts and have a lower operating temperature.

[Wicked_SVT]

Well my car shook really bad this morning and actually went into limp mode. Its at BMW right now. I will let you know what the outcome is.

[GBX]

Originally Posted by Wicked_SVT

Well my car shook really bad this morning and actually went into limp mode. Its at BMW right now. I will let you know what the outcome is.

Please do. Mine shook this am too, revs were steady though and i didn't get any codes. Let me know what they find! Thanks!

[335e92tx]

Until I changed plugs, every now and then, I would get a missfire at idle within 1 min of cold start.
None since.

[Wicked_SVT]

Originally Posted by GBX

Please do. Mine shook this am too, revs were steady though and i didn't get any codes. Let me know what they find! Thanks!

I got my car back today. Number 4 and 6 fuel injectors were leaking causing a missfire. BMW replaced numbers 4, 5, and 6 injectors and plugs. So over the last two months I have had 4 out of 6 injectors and plugs replaced. Anyone else have faulty injectors? Im curious to see if this is a common problem.

Also in case anyone is interested I have the Dinan tune and boths times I took the car in for the injectors, they were covered under warranty with no questions or hassle from the dealership.

[GBX]

An FYI to everyone who's having a similiar issue...my car is at the dealer now and they're telling me that there's a bulletin regarding misfires on cold starts...i need a software update to fix this issue. We'll see what happens.

[GBX]

Just picked up the car. Here's what the Service Invoice says: 27308 Software level performed vehicle short test, faults stored in DME 29D1, 29CC, 29D0 Misfires, 3100, 30FE Charge in Air Pressure Control. Performed test plan for fault stores found software level in vehicle out of date. Checked vehicle software at e89x-08-03-530....Performed vehicle programming with cas. Initialized FZD, TPMS, IHKA.....Programming Sucessful."

Any of that mean anything to anyone? LOL.

I asked again about Injector issues and they said that it would have thrown a different code.

They tested it this morning and said everything seemed fine.

Thoughts?

[AlpineG05]

i think maybe they updated your software? which is what they did for me the first time i went in, then the very next morning it threw a limp. i took the damn thing back and had them change my plugs and injectors.

[GBX]

Originally Posted by Alpine 335i

i think maybe they updated your software? which is what they did for me the first time i went in, then the very next morning it threw a limp. i took the damn thing back and had them change my plugs and injectors.

i know they updated my software. So far, so good. We shall see.