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Thread: Here's a fun one to try to diagnose

  1. #1
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249

    Here's a fun one to try to diagnose

    First off, the car is going into the shop tomorrow to find out what's going on with it. I don't have my odb reader with me so I can't check the codes.

    After not seeing many miles for several months, my 05 has been seeing a lot of the highway. This week took me from the NC coast to Central Virginia to Maryland to Northern Virginia to Central Virginia to the NC coast. Driving the final VA to NC leg today something felt a bit off but I wrote it off as the wind. It felt like little minor power dips. Then, on an onramp, I was coasting with the clutch in behind a truck and the engine stalled with the rpm jumping around a bit first. No CEL. Several miles later I just put the clutch in on the highway and let the revs drop down to idle. Spiky rpm and quick to stall. At speed there weren't any problems to speak of. The gear shift was bouncing around a bit more than it should have been and some of the same minor blips in power. After another 40 mins or so the CEL finally lit up.

    When I finally was off the highway any time I was at a stop I had to heel toe to keep the revs over 1500 or it would threaten to stall. At 1500 it was running ugly. Obviously not firing on every cylinder. VANOS rattling sporadically. When I finally pulled into the driveway I still had to keep the revs up to prevent a stall. Eventually coaxed it into barely running at idle. Erratic knocking and wheezing from the engine and a burning rubber smell from somewhere Midway in the engine bay on the driver's side.

    So... Thoughts/bets on what it is.

    Additional probably not relevant information. On the stock navigation screen, nav never loaded in after I stopped to get gas (before the problem appeared). The button to switch between the most recent display would just blank the screen. By the end of the trip the screen would blank on its own but I could wake it up with a button push. The screen going blank only effected the display, not the back light.

  2. #2
    Join Date
    Feb 2011
    Location
    Lexington, KY
    Posts
    4,279
    Since this fun game, I am guessing fuel pump.
    325i, 2005, 5MT, Silvergrey, leatherette, Sport package; CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump

    328i, 2010, 6MT, Spacegrey, dakota leather, M-sport packages; all stock
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  3. #3
    Join Date
    Oct 2017
    Location
    NH - The Live Free or Die State
    Posts
    790
    or even fuel filter.......
    - Pete


  4. #4
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249
    Fuel pump and filter are on my list of possibilities. We'll fuel pressure regulator. Pump is original. Fuel filter was replaced maybe 5 years ago.

  5. #5
    Join Date
    Apr 2018
    Location
    Waco, TX
    Posts
    100
    How many miles? Five years ago for a fuel filter? How many miles in that five years? My bet is lean codes due to vacuum leaks and subsequent misfire(s).

  6. #6
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249
    And out of left field we have.... A spectacularly failed DISA.

    Its right at 148k miles. 4-5 years ago for the fuel filter is the right timerange. Maybe 20k miles on the new filter.

  7. #7
    Join Date
    Feb 2011
    Location
    Lexington, KY
    Posts
    4,279
    Ah, bravo, good one ! It didn't get sucked the there did it?
    325i, 2005, 5MT, Silvergrey, leatherette, Sport package; CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump

    328i, 2010, 6MT, Spacegrey, dakota leather, M-sport packages; all stock
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  8. #8
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249
    They said it hadnt completely come apart yet but I'm sure it wasn't far from trying to make friends with the valve train.

    I'm a little pissed at myself for not considering it. The ugly sound out of intake should have been a clue. I just never would have thought that a problem with the DISA would disrupt idle that significantly. Then again...the part isn't in the car yet so it's not too late for there to be more wrong with it.

  9. #9
    Join Date
    Feb 2019
    Location
    W/S, NC
    Posts
    125
    Sounds like you got lucky at least. Glad it's solved.
    - 2005 Titanium Silver 330i ZHP 6spd -


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