N55 Error Code, Rough Idle, and White Smoke

BoostedBarrett · 05-14-2018, 04:06 PM

I recently had issues with Misfire on cylinder 3. Changed out Spark plugs, gapped to .018, New Coil packs, new hpfp.

Car still idles up and down and slightly shakes the car, and then I had a low coolant the other day. Filled up the reservoir, and 50 miles later I got a low coolant again, this time the engine went into limp mode and while running very rough there was white smoke coming from the exhaust pipe.

I have never seen water/coolant leaking on the floor of my garage. I am not sure what to do now.

These were the codes that came up on mhd below.

I am running Custom wedge stage 2 map, catless dp, larger intercooler.

https://photos.google.com/share/AF1Q...hOdlFyelFhWVh3

StuP · 05-14-2018, 04:26 PM

Not sure about an N55, but for an NA engine I'd be thinking head gasket.

HyeWarrior · 05-14-2018, 04:33 PM

Oil in the coolant?

BoostedBarrett · 05-14-2018, 04:39 PM

I don't see any, but I'll check again.

Gizmo135i · 05-14-2018, 06:17 PM

I’d pull the spark plugs and see what they look like. See if any are wet and smell like fuel which would indicate a leaking injector, or if any of them are exceptionally clean compared to the others. The car consuming coolant is somewhat worrisome, while the plugs are out I would consider a compression/leakdown test as well.

BoostedBarrett · 05-17-2018, 11:06 AM

Car had coolant in cylinder 3. Yikes. Here goes $$$

05-14-2018, 04:06 PM	#1
BoostedBarrett Second Lieutenant 27 Rep 255 Posts Drives: 2016 M3 CS Join Date: Feb 2011 Location: Chattanooga, TN iTrader: (1)	N55 Error Code, Rough Idle, and White Smoke I recently had issues with Misfire on cylinder 3. Changed out Spark plugs, gapped to .018, New Coil packs, new hpfp. Car still idles up and down and slightly shakes the car, and then I had a low coolant the other day. Filled up the reservoir, and 50 miles later I got a low coolant again, this time the engine went into limp mode and while running very rough there was white smoke coming from the exhaust pipe. I have never seen water/coolant leaking on the floor of my garage. I am not sure what to do now. These were the codes that came up on mhd below. I am running Custom wedge stage 2 map, catless dp, larger intercooler. https://photos.google.com/share/AF1Q...hOdlFyelFhWVh3
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05-14-2018, 04:26 PM	#2
StuP Private First Class 95 Rep 143 Posts Drives: 128i Join Date: May 2018 Location: Atlanta iTrader: (0)	Not sure about an N55, but for an NA engine I'd be thinking head gasket.
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05-14-2018, 04:33 PM	#3
HyeWarrior Major 747 Rep 1,119 Posts Drives: 2012 135i DCT Join Date: Aug 2010 Location: San Dimas, CA iTrader: (1)	Oil in the coolant?
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05-14-2018, 04:39 PM	#4
BoostedBarrett Second Lieutenant 27 Rep 255 Posts Drives: 2016 M3 CS Join Date: Feb 2011 Location: Chattanooga, TN iTrader: (1)	I don't see any, but I'll check again.
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05-14-2018, 06:17 PM	#5
Gizmo135i Second Lieutenant 116 Rep 264 Posts Drives: 135i n55 Join Date: May 2016 Location: Park Ridge NJ iTrader: (0)	I’d pull the spark plugs and see what they look like. See if any are wet and smell like fuel which would indicate a leaking injector, or if any of them are exceptionally clean compared to the others. The car consuming coolant is somewhat worrisome, while the plugs are out I would consider a compression/leakdown test as well.
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05-17-2018, 11:06 AM	#6
BoostedBarrett Second Lieutenant 27 Rep 255 Posts Drives: 2016 M3 CS Join Date: Feb 2011 Location: Chattanooga, TN iTrader: (1)	Car had coolant in cylinder 3. Yikes. Here goes $$$
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