Jump to content
Ad: Genuine BMW parts & accessories from the BMW official store on eBay ×

'07 335i P0312E and P0174 with no P0171

titandavid2008

By titandavid2008,
in BMW 3 Series Forum

 Share

Recommended Posts

titandavid2008 Newbie

titandavid2008

Posted
Posted

I have been getting misfire codes from cylinder 1, I did the whole switching the coils around to other cylinder to see if the misfire would follow, sometimes it does, sometimes it doesn't. Decided to go ahead and replace the coils and the spark plugs as I do not know when it had been done last if at all. I got the NGK's and the BAV Auto coils from ECS Tuning. Now it is throwing a P0312E and P0174. The reason I mention no P0171 is because that is what I keep getting asked when I mention P0174. I have called a few shops around me and they are just trying get me in the shop. I'm not driving it anywhere; so nobody is of any help.
For troubleshooting I have swapped the new coils out for the old ones; it runs just as rough, and I did reset the codes, they just came right back on. Went ahead and pulled the new spark plugs and verified the gaps on all 6. One thing to note though: ever since I changed out the coils and spark plugs, the engine has been running for less then 10 mins total time. When I pulled cylinder 1 the new spark plug was nasty looking, not wet at all, but dark brown and almost black. The other 5 are looking brand new. Thats as much as I can think of right now. I did a smoke test (hopefully I did it right) to see if maybe I messed something up, but that seemed to be fine. I'm looking for any and all ways I can troubleshoot this issue more. One thing I might do is call BMW and see what they think could be the problem. I'm really lost here.

Greydog Grand Master

Greydog

Posted
Posted

Welcome David

What your seeing are Generic codes you really need a BMW specific code reader like BMW 1.4.0, INPA, Autologic or similar they will be more specific in their description.

Regarding the codes your seeing they are associated with vacuum leaks 171 and 174 normally appear together which is why your being asked about 171 particularly as your engine is inline.

Have you checked for air and vacuum leaks include the crank case breather, I would also check the loom to the coils for any cracks or faults.

Dave

Latest Deals

BMW Official Store for genuine BMW parts & accessories

Disclaimer: As the club is an eBay Partner, The club may be compensated if you make a purchase via eBay links

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing




  • Latest Topics

    1. 0

      Rough idle problem

      Looking for some help. 2010 116i M sport with the 2.0na engine. When cold, car ticks over perfectly. After about 15 mins of driving when idling you can feel it getting a little bit rough. Nothing too bad, but the longer you idle the worse it gets. No EML. When running car runs perfectly not a flicker. Today left it idling for 10mins after I felt it and then revs started to fluctuate but still no eml. OBD scanner can’t pick anything up. Turned it off and back on and was still rough but only a little bit like when it just starts. Anyone had anything similar or can point me in a direction of where I should start looking?
      BLM06 in BMW 1 Series Forum
    2. 0

      E53 petrol fail safe again.

      Right… changed the throttle body, now goes like stink… didn’t start… new battery, now starts and goes like stink…. now drops into fail safe and says the idle valve is mechanically stuck open. where is it, how much is it… can I kick it?
      X5smw in BMW X5 Series Forum
    3. 2

      3.0i starter motor

      I stand corrected…. It wasn’t the starter. I could hear it clicking so checked the battery, amps were about 10… new battery and fired straight up…. So much for Halfords and yuasa battery testing! ….now to the next issue…
      X5smw in BMW X5 Series Forum
    4. 0

      Bmw x1 2012 won't start

      I recently had a problem with my bmw x1 2012, failed to start,fault code came up , got the foot control module and battery replacement, not even two days of driving the car won't start again and the engine light is on .mechanic is now saying it's the starter
      Marvin chui in BMW X1 Series Forum
    5. 6

      X3 2.0 automatic

      Many thanks for the help I've hot the car booked in for a full health check but it seem that the transfer box oil as not been changed for nearly 3 years so I'm hoing to do that first to see if it helps
      Davesally in BMW X3 Series Forum

  • Recent Achievements

    • Conversation Starter
      BLM06
      BLM06 earned a badge
      Conversation Starter
    • Conversation Starter
      Marvin chui
      Marvin chui earned a badge
      Conversation Starter
    • Week One Done
      Davesally
      Davesally earned a badge
      Week One Done
    • One Year In
      Backmarker
      Backmarker earned a badge
      One Year In
    • Week One Done
      Karlos70
      Karlos70 earned a badge
      Week One Done

×
×
  • Create New...

Forums

News

Membership