Spark Plug Reading (135is)

TridenTBoy · 02-05-2017, 01:27 AM

Alright, just got done replacing my spark plugs. No idea how long they've been in there but it could be up to 40k miles.

View post on imgur.com

It kinda looks like my car is running a tad rich. Which, sounds about right. Or I could be seeing what I want to see... I get terrible gas mileage. I get somewhere between 12-20mpg on most tanks. Even with relatively gentle mixed driving (good amounts of highway too), I get ~18mpg. Rarely 24-25mpg if I am cruising on freeway the entire tank at a modest speed.

tommyb13662 · 02-05-2017, 05:15 PM

You have a tune? My MPG jumped up a bunch especially on the highway.

Dmak · 02-05-2017, 05:52 PM

U should check the part number on the plugs. I thought oem n54 plugs have 3 grounds on it .

tommyb13662 · 02-05-2017, 08:47 PM

Yes original plugs do have the 3 prongs.

Gizmo135i · 02-05-2017, 09:39 PM

Nope those are original n55 plugs... they look pretty normal to me

HomoPirate · 02-06-2017, 08:06 AM

The factory spark plugs come with N55 engine have single ground electrode. The original spark plugs took out from my 2011 135i are Bosch made and they have 57k on it. However, I don't have much mpg impact due to the old spark plugs. Changing the spark plugs is a fairly easy job but time consuming. We just have to remove many covers/ clips/ air filter box/ cowl/ to finally reach the ignition coil.

TridenTBoy · 02-06-2017, 04:17 PM

Quote:

Originally Posted by tommyb13662

You have a tune? My MPG jumped up a bunch especially on the highway.

It's a 135is. It's completely stock. It does come with the PPK or whatever because that's what an IS comes with.

Still, such terrible gas mileage. Struggle to get 18mpg. I just did my 'challenge' tank and I got 17.7mpg. (Challenge means drive rather civilized and all in full auto mode with no sport mode) Included a bunch of freeway in it too. All well.

I have the correct plugs. The 135is has the N55 engine.

2PUTT · 02-10-2017, 11:49 AM

Does your area (SF) use oxygenated gas for the winter months?
When was the last time you checked your tire pressure?
When was the last time you changed your air filter?
How many miles on the car?

TridenTBoy · 02-10-2017, 01:10 PM

Quote:

Originally Posted by 2PUTT

Does your area (SF) use oxygenated gas for the winter months?
When was the last time you checked your tire pressure?
When was the last time you changed your air filter?
How many miles on the car?

It's all E10-15, all times of the year but other people with 135i's get better MPG and live here too.

Air pressure is good. Air filter is new. 39000 miles on the car.

2PUTT · 02-10-2017, 02:17 PM

Quote:

Originally Posted by TridenTBoy

It's all E10-15, all times of the year but other people with 135i's get better MPG and live here too.

Air pressure is good. Air filter is new. 39000 miles on the car.

weird. i wonder if it is running extra rich.

tyhackman15 · 02-10-2017, 02:53 PM

Get a ~$25 bluetooth OBD2 unit and the torque app. You'll be able to monitor AFRs, Vacuum, etc...

I'd think running rich would trip a code, but you never know.

02-05-2017, 01:27 AM	#1
TridenTBoy First Lieutenant 127 Rep 338 Posts Drives: 2013 BMW 135is Join Date: Nov 2016 Location: San Francisco, CA iTrader: (0) Garage List 2013 BMW 135is [0.00]	Spark Plug Reading (135is) Alright, just got done replacing my spark plugs. No idea how long they've been in there but it could be up to 40k miles. View post on imgur.com It kinda looks like my car is running a tad rich. Which, sounds about right. Or I could be seeing what I want to see... I get terrible gas mileage. I get somewhere between 12-20mpg on most tanks. Even with relatively gentle mixed driving (good amounts of highway too), I get ~18mpg. Rarely 24-25mpg if I am cruising on freeway the entire tank at a modest speed. Last edited by TridenTBoy; 02-05-2017 at 01:33 AM..
	Appreciate 0 Tweet Quote

02-05-2017, 05:15 PM	#2
tommyb13662 Second Lieutenant 52 Rep 284 Posts Drives: 2009 135i Join Date: Jan 2016 Location: Philadelphia iTrader: (0)	You have a tune? My MPG jumped up a bunch especially on the highway.
	Appreciate 0 Quote

02-05-2017, 05:52 PM	#3
Dmak Second Lieutenant 67 Rep 252 Posts Drives: 09 135 Join Date: Nov 2014 Location: Edmonton alberta iTrader: (1)	U should check the part number on the plugs. I thought oem n54 plugs have 3 grounds on it . Attached Images
	Appreciate 0 Quote

02-05-2017, 08:47 PM	#4
tommyb13662 Second Lieutenant 52 Rep 284 Posts Drives: 2009 135i Join Date: Jan 2016 Location: Philadelphia iTrader: (0)	Yes original plugs do have the 3 prongs.
	Appreciate 0 Quote

02-05-2017, 09:39 PM	#5
Gizmo135i Second Lieutenant 116 Rep 264 Posts Drives: 135i n55 Join Date: May 2016 Location: Park Ridge NJ iTrader: (0)	Nope those are original n55 plugs... they look pretty normal to me
	Appreciate 0 Quote

02-06-2017, 08:06 AM	#6
HomoPirate First Lieutenant 84 Rep 331 Posts Drives: Always BMW Join Date: Jun 2016 Location: San Diego iTrader: (3)	The factory spark plugs come with N55 engine have single ground electrode. The original spark plugs took out from my 2011 135i are Bosch made and they have 57k on it. However, I don't have much mpg impact due to the old spark plugs. Changing the spark plugs is a fairly easy job but time consuming. We just have to remove many covers/ clips/ air filter box/ cowl/ to finally reach the ignition coil. __________________ Past: E82 135i Crimson Red \| MPE \| MHD Stage1+ \| Dinan Camber Plate \| LCI Blackline \| Bavsound stage 1 \| KW Coilover V2 \| Past: E93 M3 Vert Alpine White \| Remus Sport Exhaust \| Past: F82 Yas Marina Blue Civic M4\| MPE V2 \| DP \| BM3 \| Apex FL-5 \| MP Part(s) \| Current: F87 M2 Competition Long Beach Blue \| Completely Stock \|
	Appreciate 0 Quote

02-10-2017, 11:49 AM	#8
2PUTT Captain 513 Rep 943 Posts Drives: F87 Join Date: Nov 2014 Location: Ubiquitous iTrader: (5)	Does your area (SF) use oxygenated gas for the winter months? When was the last time you checked your tire pressure? When was the last time you changed your air filter? How many miles on the car?
	Appreciate 0 Quote

02-10-2017, 02:53 PM	#11
tyhackman15 Private 21 Rep 55 Posts Drives: 2012 AW 135i Join Date: Nov 2016 Location: Austin, TX iTrader: (0)	Get a ~$25 bluetooth OBD2 unit and the torque app. You'll be able to monitor AFRs, Vacuum, etc... I'd think running rich would trip a code, but you never know.
	Appreciate 0 Quote