Cylinder misfires

sistom · 10-21-2012, 12:28 PM

I have an '08 with 51k miles. Original spark plugs, fuel pump and injectors. I started having reduced power and engine would shake during acceleration sometimes.

I have the jb4 so I read the codes and it was a misfire on two cylinders. Either 6 and 7 or 7 and 8 can't remember right now.

Last night it starting the extremely reduced power and shaking from idle and all the time now.

Could this just be my plugs? If so, can I buy them locally or do I have to order them?

Thanks in advance.

Tee-Dub · 10-21-2012, 01:29 PM

If your plugs are original my money is on them.

Dackelone · 10-21-2012, 01:55 PM

replace your spark plugs and retest. I would only use spark plugs bought from a BMW dealer. Read the DIY...

135i Spark Plug replacement DIY...
http://www.1addicts.com/forums/showthread.php?t=602804

sistom · 10-21-2012, 03:24 PM

I should go ahead and replace all 6 plugs while I'm in there right?

Spoolin Montego · 10-21-2012, 08:31 PM

Misfire on cylinders 7 and 8? You have a swapped engine?

coolguy · 10-21-2012, 09:10 PM

Quote:

Originally Posted by Spoolin Montego

Misfire on cylinders 7 and 8? You have a swapped engine?

7 & 8 are the turbos. you didn't know that

cunnyngham · 10-24-2012, 04:35 PM

Replaced my plugs with the same symptoms and it seemed fix the issue right up. I ordered the plugs from BMW online. You will also have to buy or borrow a special 14mm 16 point spark plug socket. Don't worry, it is easy. I used copper anti-seize.

sistom · 10-25-2012, 12:00 PM

wellll, that didn't work.

Next possibility, coils?

SteveAZ · 10-29-2012, 05:21 AM

Yes, next is to swap the coil packs, if it doesn't follow, next is the injectors. For me...it was the injectors. However, you're gonna need to read the codes again as you obviously got the cylinders wrong.

slow35i · 11-01-2012, 01:11 AM

should probably replace bank 1 injectors, injectors need to be calibrated when replaced otherwise you will have a rough running vehicle, or you can pull off your intake manifold and check your intake valves sure they got lots of carbon build up

Onederer · 11-01-2012, 09:19 PM

easiest thing to do is swap the coils and see if the codes follows them. Make sure to mark the coils so you know what cyclinder they came from. I was having the exact symptoms you descibed and turned out to be 2 bad coilpacks. Cost me about $100 and an hour of time.

sistom · 11-05-2012, 05:14 PM

It was a bad coil. Problem solved!

Tee-Dub · 11-05-2012, 08:19 PM

Did you do the plugs too? The indy BMW service guy I use said weak/old plugs can take out coils or accelerate their demise.

sistom · 11-07-2012, 08:55 AM

yup, switched plugs first to no avail. Then ordered the coils, replaced them and she started right up beautifully. I could have kissed her I was so happy.

10-21-2012, 12:28 PM	#1
sistom Second Lieutenant 61 Rep 253 Posts Drives: '08 135i M-Sport Coupé Join Date: Feb 2011 Location: Saint Simons Island, Georgia iTrader: (3) Garage List 2023 M440xi Gran Coupe [0.00]	Cylinder misfires I have an '08 with 51k miles. Original spark plugs, fuel pump and injectors. I started having reduced power and engine would shake during acceleration sometimes. I have the jb4 so I read the codes and it was a misfire on two cylinders. Either 6 and 7 or 7 and 8 can't remember right now. Last night it starting the extremely reduced power and shaking from idle and all the time now. Could this just be my plugs? If so, can I buy them locally or do I have to order them? Thanks in advance.
	Appreciate 0 Tweet Quote

10-21-2012, 01:29 PM	#2
Tee-Dub Captain 35 Rep 753 Posts Drives: 2008 135i Join Date: May 2009 Location: Vancouver, WA iTrader: (9)	If your plugs are original my money is on them.
	Appreciate 0 Quote

10-21-2012, 01:55 PM	#3
Dackelone European Editor 10539 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	replace your spark plugs and retest. I would only use spark plugs bought from a BMW dealer. Read the DIY... 135i Spark Plug replacement DIY... http://www.1addicts.com/forums/showthread.php?t=602804 __________________ Dackel's European Delivery Museum Guide
	Appreciate 0 Quote

10-21-2012, 03:24 PM	#4
sistom Second Lieutenant 61 Rep 253 Posts Drives: '08 135i M-Sport Coupé Join Date: Feb 2011 Location: Saint Simons Island, Georgia iTrader: (3) Garage List 2023 M440xi Gran Coupe [0.00]	I should go ahead and replace all 6 plugs while I'm in there right?
	Appreciate 0 Quote

10-21-2012, 08:31 PM	#5
Spoolin Montego Captain 602 Rep 871 Posts Drives: 16 m3/20 x5m/23 m3 Join Date: Mar 2012 Location: Orange County iTrader: (1)	Misfire on cylinders 7 and 8? You have a swapped engine?
	Appreciate 0 Quote

10-24-2012, 04:35 PM	#7
cunnyngham New Member 0 Rep 14 Posts Drives: 08 135i Join Date: May 2012 Location: Columbus, Ohio, USA iTrader: (0)	Replaced my plugs with the same symptoms and it seemed fix the issue right up. I ordered the plugs from BMW online. You will also have to buy or borrow a special 14mm 16 point spark plug socket. Don't worry, it is easy. I used copper anti-seize.
	Appreciate 0 Quote

10-25-2012, 12:00 PM	#8
sistom Second Lieutenant 61 Rep 253 Posts Drives: '08 135i M-Sport Coupé Join Date: Feb 2011 Location: Saint Simons Island, Georgia iTrader: (3) Garage List 2023 M440xi Gran Coupe [0.00]	wellll, that didn't work. Next possibility, coils?
	Appreciate 0 Quote

10-29-2012, 05:21 AM	#9
SteveAZ Captain 60 Rep 654 Posts Drives: 135i Cab Join Date: Jul 2012 Location: Phoenix, AZ iTrader: (5)	Yes, next is to swap the coil packs, if it doesn't follow, next is the injectors. For me...it was the injectors. However, you're gonna need to read the codes again as you obviously got the cylinders wrong.
	Appreciate 0 Quote

11-01-2012, 01:11 AM	#10
slow35i Enlisted Member 3 Rep 48 Posts Drives: 13' glacier silver 328xi Join Date: Oct 2012 Location: Grandview, WA iTrader: (0)	should probably replace bank 1 injectors, injectors need to be calibrated when replaced otherwise you will have a rough running vehicle, or you can pull off your intake manifold and check your intake valves sure they got lots of carbon build up
	Appreciate 0 Quote

11-01-2012, 09:19 PM	#11
Onederer Private 0 Rep 64 Posts Drives: 2008 135i Join Date: Mar 2012 Location: PA iTrader: (4)	easiest thing to do is swap the coils and see if the codes follows them. Make sure to mark the coils so you know what cyclinder they came from. I was having the exact symptoms you descibed and turned out to be 2 bad coilpacks. Cost me about $100 and an hour of time. __________________ 2008 135i/6-Speed MT/Cobb Stage 1-Aggressive 93 Oct/Auto Carbon Rear Spoiler/Berk Race Exhaust/BMS LED Angel Eyes/LCI Tails
	Appreciate 0 Quote

11-05-2012, 05:14 PM	#12
sistom Second Lieutenant 61 Rep 253 Posts Drives: '08 135i M-Sport Coupé Join Date: Feb 2011 Location: Saint Simons Island, Georgia iTrader: (3) Garage List 2023 M440xi Gran Coupe [0.00]	It was a bad coil. Problem solved!
	Appreciate 0 Quote

11-05-2012, 08:19 PM	#13
Tee-Dub Captain 35 Rep 753 Posts Drives: 2008 135i Join Date: May 2009 Location: Vancouver, WA iTrader: (9)	Did you do the plugs too? The indy BMW service guy I use said weak/old plugs can take out coils or accelerate their demise.
	Appreciate 0 Quote

11-07-2012, 08:55 AM	#14
sistom Second Lieutenant 61 Rep 253 Posts Drives: '08 135i M-Sport Coupé Join Date: Feb 2011 Location: Saint Simons Island, Georgia iTrader: (3) Garage List 2023 M440xi Gran Coupe [0.00]	yup, switched plugs first to no avail. Then ordered the coils, replaced them and she started right up beautifully. I could have kissed her I was so happy.
	Appreciate 0 Quote