2012 128i N51 rough idle a little struggle when pressing the gas....

Fes128 · 11-19-2017, 12:39 PM

Hello all.

This is my first time experiencing this.

Service Engine Soon light is on.

Also I noticed when I put the key in, “service engine” shows up at the start on the LED menu, then disappears.

It started fine in the morning. It was parked for an hour, started her up, idle was regular. As soon as I pressed the gas, she did not feel normal and noticed her struggling for air.

At stand still, again, rough idle, struggling to breathe.

Taking her in to get her checked.

Any ideas what this would be?

No access to a code reader.

Thanks

Reefy · 11-29-2017, 08:57 PM

I have been having the same issue. I read the code that was given from my car and said cylinder 5 misfire.

Sdracing · 11-30-2017, 01:10 PM

Spark plugs need to be tightened/replaced or you're due for a fuel pump failure.

I've had both issues.

In California, because it's an ultra low emissions engine, the warranty on the fuel pumps is extended to 120k miles. So mine was replaced for free with a 110k on the clock.

Reefy · 11-30-2017, 06:30 PM

Just changed my spark plug and coil today for my cylinder 5 misfire, solved the problem! Car is running smooth and accelerating quickly again!

m_thompson · 12-01-2017, 07:10 AM

Quote:

Originally Posted by Sdracing

In California, because it's an ultra low emissions engine, the warranty on the fuel pumps is extended to 120k miles. So mine was replaced for free with a 110k on the clock.

The warranty is 15 years / 150k miles for SULEV originally purchased in California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Washington state, and Washington D.C.

Sdracing · 12-01-2017, 05:39 PM

Quote:

Originally Posted by Reefy

Just changed my spark plug and coil today for my cylinder 5 misfire, solved the problem! Car is running smooth and accelerating quickly again!

Nice. Coils almost never go out on these cars. Are you sure you had a bad coil or did you assume you did?

Sdracing · 12-01-2017, 05:41 PM

Quote:

Originally Posted by m_thompson

The warranty is 15 years / 150k miles for SULEV originally purchased in California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Washington state, and Washington D.C.

Nice! I remembered 120 but I'll take 150k Good correction.

Suprgnat · 12-01-2017, 08:24 PM

Quote:

Originally Posted by m_thompson

The warranty is 15 years / 150k miles for SULEV originally purchased in California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Washington state, and Washington D.C.

My reading of the warranty is that the SULEV must be registered (they specifically use the word "registered" and not "purchased") in one of those states, but I think SULEVs not registered in those states still get pretty good warranty protection.

Reefy · 12-05-2017, 06:31 PM

Quote:

Originally Posted by Sdracing

Nice. Coils almost never go out on these cars. Are you sure you had a bad coil or did you assume you did?

I just replace both for a peace of mind

$iriu$black · 03-16-2018, 10:31 AM

So I just changed plugs (all six) on my car about ~17XXX mi ago, and this morning I got a Cyl 6 misfire. Happened as I accelerated on the highway and really stepped on it. It shook like crazy. Had it cleared but it intermittently comes back. Is it possible that the coil went this time. Note that I only changed plugs before, not coils.

DIY/dumb question: Where is Cyl 6 and can I just swap it with another one to "check?" I don't think it's the plug but the coil itself. Any advice is appreciated.

Thanks to this great community, I have learned a lot along the way of my ownership of my 128.

Z3SpdDmn · 03-16-2018, 11:09 AM

Quote:

Originally Posted by $iriu$black

So I just changed plugs (all six) on my car about ~17XXX mi ago, and this morning I got a Cyl 6 misfire. Happened as I accelerated on the highway and really stepped on it. It shook like crazy. Had it cleared but it intermittently comes back. Is it possible that the coil went this time. Note that I only changed plugs before, not coils.

DIY/dumb question: Where is Cyl 6 and can I just swap it with another one to "check?" I don't think it's the plug but the coil itself. Any advice is appreciated.

Thanks to this great community, I have learned a lot along the way of my ownership of my 128.

6 is furthest to the back. You could swap to see if it follows the coils. That would be a good check if it's happening consistently.

$iriu$black · 03-16-2018, 12:41 PM

Quote:

Originally Posted by Z3SpdDmn

6 is furthest to the back. You could swap to see if it follows the coils. That would be a good check if it's happening consistently.

So this is the closest one to the windshield correct? It should be easy as it doesn't require tools as the coils have plastic "snaps" correct? I feel dumb with these Qs but hey, a man has to start from somewhere.

$iriu$black · 03-16-2018, 10:55 PM

Any advice on which one of these two is the one that is compatible to a 2012 128? All taken from ECS and both said compatible.

https://www.ecstuning.com/b-genuine-...h/12138616153/

OR

https://www.ecstuning.com/b-genuine-...h/12138647689/

Thank you again for the knowledge/advice imparted here by everyone.

Z3SpdDmn · 03-20-2018, 12:18 PM

Quote:

Originally Posted by $iriu$black

So this is the closest one to the windshield correct? It should be easy as it doesn't require tools as the coils have plastic "snaps" correct? I feel dumb with these Qs but hey, a man has to start from somewhere.

Yes.

I don't know what the functional difference would be between those coils. I'd get the black ones. Thats what my car has as OEM.

Also check fcpeuro.com

$iriu$black · 03-28-2018, 03:17 PM

So i tried to swap coilpacks from 6 to 5. Still got the cyl6 misfire. Changed the plug, still got the same code. I gave up and brought it to my indy. Anything else beyond a coil or plug is out of my league, though I know it’s doable.

Edit: so I called my local dealer and they said that it “might “ be covered under the SULEV N51 warranty if found to be part of the fuel system or emissions system. My dilemma now is, I left it at my indy and it will be checked probably tomorrow and my dealer appointment is on Friday. Should I keep it my Indy for tomorrow and if he finds that it’s a fuel injector or something, just tell him don’t work on it as it’s covered at the dealer and then take it there Friday? Just wanted to figure out he best strategy here. Thanks for any advice mates!

11-19-2017, 12:39 PM	#1
Fes128 Private First Class 29 Rep 117 Posts Drives: BMW 128i M Sport Join Date: Apr 2015 Location: Torrance, Ca iTrader: (0)	2012 128i N51 rough idle a little struggle when pressing the gas.... Hello all. This is my first time experiencing this. Service Engine Soon light is on. Also I noticed when I put the key in, “service engine” shows up at the start on the LED menu, then disappears. It started fine in the morning. It was parked for an hour, started her up, idle was regular. As soon as I pressed the gas, she did not feel normal and noticed her struggling for air. At stand still, again, rough idle, struggling to breathe. Taking her in to get her checked. Any ideas what this would be? No access to a code reader. Thanks
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11-29-2017, 08:57 PM	#2
Reefy Private First Class 38 Rep 105 Posts Drives: 2012 128i BMW, 2017 X1 BMW 28i Join Date: Dec 2016 Location: Washington DC iTrader: (0)	I have been having the same issue. I read the code that was given from my car and said cylinder 5 misfire.
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11-30-2017, 01:10 PM	#3
Sdracing Private 28 Rep 90 Posts Drives: 128i Join Date: Jul 2010 Location: Colorado iTrader: (0)	Spark plugs need to be tightened/replaced or you're due for a fuel pump failure. I've had both issues. In California, because it's an ultra low emissions engine, the warranty on the fuel pumps is extended to 120k miles. So mine was replaced for free with a 110k on the clock.
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11-30-2017, 06:30 PM	#4
Reefy Private First Class 38 Rep 105 Posts Drives: 2012 128i BMW, 2017 X1 BMW 28i Join Date: Dec 2016 Location: Washington DC iTrader: (0)	Just changed my spark plug and coil today for my cylinder 5 misfire, solved the problem! Car is running smooth and accelerating quickly again!
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03-16-2018, 10:31 AM	#10
$iriu$black Captain 244 Rep 616 Posts Drives: 2012 BMW 128 Join Date: Dec 2014 Location: NE iTrader: (5)	So I just changed plugs (all six) on my car about ~17XXX mi ago, and this morning I got a Cyl 6 misfire. Happened as I accelerated on the highway and really stepped on it. It shook like crazy. Had it cleared but it intermittently comes back. Is it possible that the coil went this time. Note that I only changed plugs before, not coils. DIY/dumb question: Where is Cyl 6 and can I just swap it with another one to "check?" I don't think it's the plug but the coil itself. Any advice is appreciated. Thanks to this great community, I have learned a lot along the way of my ownership of my 128.
	Appreciate 0 Quote

03-16-2018, 10:55 PM	#13
$iriu$black Captain 244 Rep 616 Posts Drives: 2012 BMW 128 Join Date: Dec 2014 Location: NE iTrader: (5)	Any advice on which one of these two is the one that is compatible to a 2012 128? All taken from ECS and both said compatible. https://www.ecstuning.com/b-genuine-...h/12138616153/ OR https://www.ecstuning.com/b-genuine-...h/12138647689/ Thank you again for the knowledge/advice imparted here by everyone.
	Appreciate 0 Quote

03-28-2018, 03:17 PM	#15
$iriu$black Captain 244 Rep 616 Posts Drives: 2012 BMW 128 Join Date: Dec 2014 Location: NE iTrader: (5)	So i tried to swap coilpacks from 6 to 5. Still got the cyl6 misfire. Changed the plug, still got the same code. I gave up and brought it to my indy. Anything else beyond a coil or plug is out of my league, though I know it’s doable. Edit: so I called my local dealer and they said that it “might “ be covered under the SULEV N51 warranty if found to be part of the fuel system or emissions system. My dilemma now is, I left it at my indy and it will be checked probably tomorrow and my dealer appointment is on Friday. Should I keep it my Indy for tomorrow and if he finds that it’s a fuel injector or something, just tell him don’t work on it as it’s covered at the dealer and then take it there Friday? Just wanted to figure out he best strategy here. Thanks for any advice mates! Last edited by $iriu$black; 03-28-2018 at 04:06 PM..
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