Rough idle, Service Engine Soon. Goes Away After Restart?

flyinb501 · 11-09-2015, 10:21 AM

Hey Guys,

On my way to work today, the car was running perfectly. I exited the freeway, and stopped at the light, and all of a sudden the car started idling rough and the SES light came on. After pulling away it felt the car was running on 5 cylinders. I pulled into the parking lot, turned the car off and started back up and it went a way. Any idea what this could be?

I just changed the plugs, coils, and flashed a stage 1 MHD tune last week. I'm bone stock otherwise. Any help is appreciated.

John 070 · 11-09-2015, 10:29 AM

Could have a shadow code....wild guess is you'll find a misfire code if you plug into your car....

flyinb501 · 11-09-2015, 12:31 PM

What is a shadow code?

I just drove it to an appointment and everything was fine. I am going to read the codes later today when I get a chance. I will report what I find.

flyinb501 · 11-09-2015, 04:38 PM

Here are the codes:

2E1C Ignition, cylinder 5
29D1 Misfirings, cylinder 5

335NJ · 11-09-2015, 06:13 PM

Sounds like a maybe bad injector. Does it throw any codes on a cold start after sitting for 8-10 hours?

Can you replicate the issue again? Try to get a log of it.

flyinb501 · 11-10-2015, 10:01 AM

Okay, it happened again and I was not able to get it to go away with restarting the car. I drove the car for about 5 min this morning and stopped at a light, and it happened. Same codes. It seems cylinder 5 is not firing anymore. Could the coil pack I just installed already have gone bad? I am going to try moving the coil pack to another cylinder tonight and see if it the problem follows the coil pack.

Could this be a bad injector?

TheBigYahi · 11-10-2015, 01:24 PM

Check that the connector is fully seated. I got through 3 cylinders when I replaced mine before I noticed that they weren't being drawing in fully by the lever. There shouldn't be a gap at the end if it is in there right.

flyinb501 · 11-10-2015, 03:44 PM

Quote:

Originally Posted by TheBigYahi

Check that the connector is fully seated. I got through 3 cylinders when I replaced mine before I noticed that they weren't being drawing in fully by the lever. There shouldn't be a gap at the end if it is in there right.

Interesting... I will check tonight. Thanks for the feedback.

flyinb501 · 11-12-2015, 10:32 AM

Update:

I replaced the cylinder 5 coil pack with one of the old ones. It's been 2 days and I haven't had the problem re-occur. So hopefully it was just a bad coil pack.

11-09-2015, 10:21 AM	#1
flyinb501 Captain 72 Rep 627 Posts Drives: 2009 E90 335i Join Date: Nov 2007 Location: Minneapolis, MN iTrader: (1)	Rough idle, Service Engine Soon. Goes Away After Restart? Hey Guys, On my way to work today, the car was running perfectly. I exited the freeway, and stopped at the light, and all of a sudden the car started idling rough and the SES light came on. After pulling away it felt the car was running on 5 cylinders. I pulled into the parking lot, turned the car off and started back up and it went a way. Any idea what this could be? I just changed the plugs, coils, and flashed a stage 1 MHD tune last week. I'm bone stock otherwise. Any help is appreciated.
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11-09-2015, 10:29 AM	#2
John 070 Lieutenant General 1706 Rep 14,829 Posts Drives: 335i cpe Join Date: Oct 2006 Location: ZSP/ZPP/ZCW iTrader: (0)	Could have a shadow code....wild guess is you'll find a misfire code if you plug into your car....
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11-09-2015, 12:31 PM	#3
flyinb501 Captain 72 Rep 627 Posts Drives: 2009 E90 335i Join Date: Nov 2007 Location: Minneapolis, MN iTrader: (1)	What is a shadow code? I just drove it to an appointment and everything was fine. I am going to read the codes later today when I get a chance. I will report what I find.
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11-09-2015, 04:38 PM	#4
flyinb501 Captain 72 Rep 627 Posts Drives: 2009 E90 335i Join Date: Nov 2007 Location: Minneapolis, MN iTrader: (1)	Here are the codes: 2E1C Ignition, cylinder 5 29D1 Misfirings, cylinder 5
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11-09-2015, 06:13 PM	#5
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	Sounds like a maybe bad injector. Does it throw any codes on a cold start after sitting for 8-10 hours? Can you replicate the issue again? Try to get a log of it.
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11-10-2015, 10:01 AM	#6
flyinb501 Captain 72 Rep 627 Posts Drives: 2009 E90 335i Join Date: Nov 2007 Location: Minneapolis, MN iTrader: (1)	Okay, it happened again and I was not able to get it to go away with restarting the car. I drove the car for about 5 min this morning and stopped at a light, and it happened. Same codes. It seems cylinder 5 is not firing anymore. Could the coil pack I just installed already have gone bad? I am going to try moving the coil pack to another cylinder tonight and see if it the problem follows the coil pack. Could this be a bad injector?
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11-10-2015, 01:24 PM	#7
TheBigYahi Private First Class 40 Rep 164 Posts Drives: 2006 330xi 6MT Join Date: Jun 2014 Location: Syracuse, NY iTrader: (0)	Check that the connector is fully seated. I got through 3 cylinders when I replaced mine before I noticed that they weren't being drawing in fully by the lever. There shouldn't be a gap at the end if it is in there right.
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11-12-2015, 10:32 AM	#9
flyinb501 Captain 72 Rep 627 Posts Drives: 2009 E90 335i Join Date: Nov 2007 Location: Minneapolis, MN iTrader: (1)	Update: I replaced the cylinder 5 coil pack with one of the old ones. It's been 2 days and I haven't had the problem re-occur. So hopefully it was just a bad coil pack.
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