BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      11-26-2012, 09:56 PM   #1
renesis27
Private First Class
13
Rep
143
Posts

 
Drives: '08 135i Coupe Black Saphire
Join Date: Apr 2012
Location: Philadelphia

iTrader: (0)

Angry Possible fuel injector issue?

Put new plugs in about a month ago and started to misfire...swapped coils and still misfiring from time to time in cylinder 5. Weird thing is that it only misfires when I opening her up and when its boosting towards 15lbs...if I keep it to 10lbs its fine. I am going to replaced that plug tomorrow thinking maybe its the plug that is fouled and was bad from the start...my other thought is that if it still does it with the new plug, then it has to be injectors right? Can it be possible that my injector is already bad? I have an 08 with only 50,600 miles on her...just seems strange no misfire when hit around 10, but when you open her up more than that..boom misfire and then it goes away once you turn her off and on again...any thought?
Appreciate 0
      11-26-2012, 10:17 PM   #2
Dackelone
Moderator
Dackelone's Avatar
Germany
689
Rep
16,663
Posts

 
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

iTrader: (1)

Did you use BMW bought plugs? See my Spark Plug DYI for why. Aftermarket plugs are known to cause issues.

IF your plugs are good, then it can be coils or injectors.
Appreciate 0
      11-26-2012, 10:36 PM   #3
Tee-Dub
Captain
Tee-Dub's Avatar
United_States
11
Rep
753
Posts

 
Drives: 2008 135i
Join Date: May 2009
Location: Vancouver, WA

iTrader: (9)

My car had 3 injectors replaced under a recall, all before hitting 35k miles.
Appreciate 0
      11-26-2012, 11:04 PM   #4
renesis27
Private First Class
13
Rep
143
Posts

 
Drives: '08 135i Coupe Black Saphire
Join Date: Apr 2012
Location: Philadelphia

iTrader: (0)

I don't think it's the coils because I've swapped them around and it only occurs in cylinder 5. I bought a oem BMW plug and will install it tomorrow so ill keep everyone posted. My guess is if that doesn't fix it it has to be an injector but idk how to change that myself
Appreciate 0
      11-27-2012, 11:31 AM   #5
Fed P
Private First Class
7
Rep
111
Posts

 
Drives: 135i
Join Date: Mar 2012
Location: Russia

iTrader: (0)

It's not too hard actually. You unscrew the fuel pipe going from the main rail to the injector (careful, it can spray fuel, especially if you haven't let it all cool), unplug the electric cable that supplies the injector, unscrew a plate holding down the injectors (3 plates, each one holds 2 injectors, 1-2, 3-4, 5-6), pull the injector up and out, replace with new. If going with new it's much simpler and you need less special tools, because if replacing existing then you need to do a bit more work with the seal on the end of the injector which has to be replaced if you don't reinstall the injector within 5 minutes of taking it out (supposedly the sealing ring swells up).

I would do this on a cold car and I would unplug the battery just in case, it's never a bad idea IMO.

However, since your issue started after changing the plugs, it's probably not a coincidence!
Appreciate 0
      11-28-2012, 09:20 PM   #6
renesis27
Private First Class
13
Rep
143
Posts

 
Drives: '08 135i Coupe Black Saphire
Join Date: Apr 2012
Location: Philadelphia

iTrader: (0)

So quick update...I replaced the plug and beat the shit out of my car when it was warmed to proper temps and didn't misfire yet. Hopefully that fixed it. My other question is that the car feels sluggish and I'm not sure if it is due to the cold weather here in Philly right now...about 35 degrees. Also, anyone know any other possible issue with idle not being as smooth as it should be? I replaced plugs already and have replaced the valve cover gasket. Don't know if this has anything to do with it, but I was watching my spark advance and it was jumping from -3 to 2 and wasn't sure if that was normal or not..Thanks for the help guys!
Appreciate 0
      11-30-2012, 10:00 AM   #7
slow35i
Enlisted Member
0
Rep
47
Posts

 
Drives: 13' glacier silver 328xi
Join Date: Oct 2012
Location: Grandview, WA

iTrader: (0)

Have your intake ports carbon blasted @ 50k I'm suprised you lasted this long , we've had to perform carbon blasting on cars as low as 15k miles ,also perform a fuel injection flush with BMW FUEL SYSTEM concentrate (blueish/greenish bottle )
Appreciate 0
      11-30-2012, 10:02 AM   #8
slow35i
Enlisted Member
0
Rep
47
Posts

 
Drives: 13' glacier silver 328xi
Join Date: Oct 2012
Location: Grandview, WA

iTrader: (0)

Were starting to recommend it as a service interval of every 30k
Appreciate 0
      11-30-2012, 10:17 AM   #9
Dackelone
Moderator
Dackelone's Avatar
Germany
689
Rep
16,663
Posts

 
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

iTrader: (1)

Quote:
Originally Posted by renesis27 View Post
So quick update...I replaced the plug and beat the shit out of my car when it was warmed to proper temps and didn't misfire yet. Hopefully that fixed it. My other question is that the car feels sluggish and I'm not sure if it is due to the cold weather here in Philly right now...about 35 degrees. Also, anyone know any other possible issue with idle not being as smooth as it should be? I replaced plugs already and have replaced the valve cover gasket. Don't know if this has anything to do with it, but I was watching my spark advance and it was jumping from -3 to 2 and wasn't sure if that was normal or not..Thanks for the help guys!
Any oil leaks, like a valve cover gasket(VCG) will also cause a vacuum leak. Vacuum leaks will cause a rough idle. Maybe your VCG is still leaking. ?

It could also be the winter blends of fuel in your area. Maybe change fuel brands. ?

Sounds like the spark plugs were your issue.
Appreciate 0
      11-30-2012, 11:11 PM   #10
Tee-Dub
Captain
Tee-Dub's Avatar
United_States
11
Rep
753
Posts

 
Drives: 2008 135i
Join Date: May 2009
Location: Vancouver, WA

iTrader: (9)

If you were at 50k on original plugs it was past time to replace them all, especially if you're tuned. I've heard guys recommend every 25k on a tuned car. BMW says 45k as a stock recommendation. Running a tune will show weaknesses in your ignition system from what I've been reading.
Appreciate 0
      12-02-2012, 07:35 PM   #11
renesis27
Private First Class
13
Rep
143
Posts

 
Drives: '08 135i Coupe Black Saphire
Join Date: Apr 2012
Location: Philadelphia

iTrader: (0)

I've changed the plugs..guess the one new plug I bought was foul and causing issues. The car is boosting as high as 15 lbs...could be the cold weather. I don't know what other gas to use. I only go to shell or sunoco and ONLY use 93. SLOW35I where do I get this fuel system concentrate? and do you work at a dealership or something that you are saying WE are starting to recommend it? Thanks guys!
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 10:42 PM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST