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  1. #1

    Help me prioritize next steps (acceleration shudder)

    I bought my lovely 2004 330ci about six weeks ago and love her. Shortly after buying her an occasional shudder would happen when accelerating between 75-85mph and she didn't pass smog inspection. I replaced the upstream 02 sensors, she passed smog, and the shudder abated (my E39 530 had the same issue and repair a few months ago).

    I did my first HPDE in this car last weekend and had no acceleration shudders in two days of hard driving. It started again on the highway Monday, so I thought it couldn't hurt and put in some Lucas injector cleaner and all was well again until today.

    The shudder only happens about once every 50 miles or so and between 75-85mph. When this occurs all is smooth to 75 then again after 85. Otherwise, the car runs like a dream.

    I'm getting a code that could be due to 02s, MAF, injectors, and so on (01075? Don't have my reader with me). Should I clean the MAF next? Is there a most likely culprit to investigate?

  2. #2
    Join Date
    Mar 2016
    Location
    Madison, Alabama
    Posts
    335
    Check the Fuel Filter.
    Family that races together stays together
    2005 330Ci 6MT SGM (x2)

  3. #3
    Join Date
    Feb 2014
    Location
    Kitchener, ON
    Posts
    6,036
    Quote Originally Posted by Jennshark View Post
    I bought my lovely 2004 330ci about six weeks ago and love her. Shortly after buying her an occasional shudder would happen when accelerating between 75-85mph and she didn't pass smog inspection. I replaced the upstream 02 sensors, she passed smog, and the shudder abated (my E39 530 had the same issue and repair a few months ago).

    I did my first HPDE in this car last weekend and had no acceleration shudders in two days of hard driving. It started again on the highway Monday, so I thought it couldn't hurt and put in some Lucas injector cleaner and all was well again until today.

    The shudder only happens about once every 50 miles or so and between 75-85mph. When this occurs all is smooth to 75 then again after 85. Otherwise, the car runs like a dream.

    I'm getting a code that could be due to 02s, MAF, injectors, and so on (01075? Don't have my reader with me). Should I clean the MAF next? Is there a most likely culprit to investigate?
    are you always in the same gear when it happens - 6th? if so, that RPM range with the stock rear end is about 2600-3000RPM, which some folks have had stuttering issues in. i also experienced it in my ZHP sedan.

    what i've concluded is that it's caused by a worn DMF. my ZHP sedan did this, and after swapping the drivetrain into the Touring, it's gone. 100% gone. i changed the DMF and stock clutch out for the valeo SMF kit, but nothing else changed... not even the software! so i'm really wondering if that's it.

    and i think spenser had the same issue recently, so once he gets the Blue Bandit back up and running with the SMF kit, we shall see if my theory is correct...
    peter

    2004 330i ZHP
    2005 330iT ZHP
    2010 328iT M Sport

  4. #4
    Join Date
    May 2011
    Location
    Jacksonville, Florida
    Posts
    2,202
    Quote Originally Posted by PetesZ View Post
    Check the Fuel Filter.
    OP this is a good starting point. What's the mileage?

    Sent from my Nexus 5X using Tapatalk
    2005 Jet Black 6MT ZHP "Family First"
    ~Rob~

  5. #5
    Join Date
    Mar 2016
    Location
    Madison, Alabama
    Posts
    335
    Family that races together stays together
    2005 330Ci 6MT SGM (x2)

  6. #6
    Join Date
    May 2011
    Location
    Jacksonville, Florida
    Posts
    2,202
    Wait the thermostat would cause those codes? If it's happening at high speeds, maybe the tstat has failed and is stuck open?

    OP do you ever notice your coolant guage showing below 12 o clock when on the highway after it's warmed up?

    Sent from my Nexus 5X using Tapatalk
    2005 Jet Black 6MT ZHP "Family First"
    ~Rob~

  7. #7
    Join Date
    Feb 2011
    Location
    Valparaiso, IN
    Posts
    3,595
    Quote Originally Posted by Newjack View Post
    Wait the thermostat would cause those codes? If it's happening at high speeds, maybe the tstat has failed and is stuck open?

    OP do you ever notice your coolant guage showing below 12 o clock when on the highway after it's warmed up?

    Sent from my Nexus 5X using Tapatalk
    Wouldn't hurt to clean the maf, no? Doesn't seem like the culprit, but it's quick and free.

    Also, your 530 had this same shudder? Same symptoms and everything?


  8. #8
    Join Date
    Mar 2011
    Location
    Independence KY
    Posts
    2,832
    Clean the MAF, check your plugs, check fuel filter
    2005 BMW 330i ZHP - BMWP brakes/intake/strut bar/shifter, Coby wraps interior, BBS CHs, Eagle Eye LED tails, LED fog lights, GC coilovers, Sprint Booster/sport button mod, 4.5 LCM w/ programming, Xtrons 9inch HU, BSW stg1, dynamat, M3 sedan dead pedal, oCarbon CF interior trim, CF seat backs, 2x2 CF MTECH2 diffuser, CF cabin filter cover



  9. #9
    Join Date
    Feb 2011
    Location
    Valparaiso, IN
    Posts
    3,595
    Quote Originally Posted by BADCLOWN View Post
    Clean the MAF, check your plugs, check fuel filter
    I like the plugs for this for some reason. I dunno why, though.


    Sent from my iPhone using Tapatalk


  10. #10
    Join Date
    Mar 2011
    Location
    Independence KY
    Posts
    2,832
    If not, maybe coilpacks
    2005 BMW 330i ZHP - BMWP brakes/intake/strut bar/shifter, Coby wraps interior, BBS CHs, Eagle Eye LED tails, LED fog lights, GC coilovers, Sprint Booster/sport button mod, 4.5 LCM w/ programming, Xtrons 9inch HU, BSW stg1, dynamat, M3 sedan dead pedal, oCarbon CF interior trim, CF seat backs, 2x2 CF MTECH2 diffuser, CF cabin filter cover



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