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Thread: first start turbo problems

  1. #51
    Join Date
    Apr 2015
    Location
    Tennessee
    Posts
    908
    My Cars
    1998 BMW 328i
    Quote Originally Posted by IR M5 View Post

    Btw your vacuum at idle is super low. Something isn't right.
    Thats What I'm thinking too. My idle vacuum is somewhere around 20 in/hg and his is like 8

    Sent from my VS987 using Tapatalk

  2. #52
    Join Date
    Jul 2009
    Location
    Montreal, QC Canada
    Posts
    65
    My Cars
    95' 240sx, 98' 328is
    Synapse sells an adapter for the BOV that keeps it closed at idle, i got that and it helped me a little bit. more driveability wise though i was getting stuttering while driving on minimal throttle. Im regretting that BOV though i feel like it is causing other issues.

  3. #53
    Join Date
    Dec 2013
    Location
    Raleigh
    Posts
    76
    My Cars
    1993 325is
    i actually ordered that antistall kit directly from synapse, and 3 days later i got a refund so not sure if they are discontinued or not. i was able to adjust the preload spring in and remove one vacuum line from the back and now its closed at idle.

    bit of an update though, looking over my maf wiring the black wire maf side was straight up not even connected if not intermittently connected. it looked like it was in the butt connector but i was able to pull it right out. fuck. corrected that no change to anything. i can unplug it and watch the afr go from solid 8 to a fluctuating 9.5-10.5 with a hunting idle. plug it back in and it corrects back to 8. measured voltage @ maf and was getting 1.2v. technica is saying thats way too high and it should be at about .75v. so new maf on the way. hopefully that should get me closer to stoich.

    image1.JPG

  4. #54
    Join Date
    Jan 2016
    Location
    Littleton, Co
    Posts
    89
    My Cars
    E36 S52 M3/4/5 Cos. Blk.
    Maybe that maf is bad, or broken now. You ordered a new from technica? Maybe solder it this time? Really hope that is the 'simple' issue. Fingers crossed.
    '97 BMW M3/4/5, Cosmos Black.

    '05 Volvo S40 T5 AWD.

  5. #55
    Join Date
    Dec 2013
    Location
    Raleigh
    Posts
    76
    My Cars
    1993 325is
    Replaced the maf, new plugs and shes running better than ever. spins through third. thanks for all the help guys.

  6. #56
    Join Date
    Sep 2013
    Location
    Roxbury, MA
    Posts
    522
    My Cars
    1995 M3 Turba
    This ^^^ vacuum reading is certainly the route. On start up it should be lowest 15 and will increase numerically I have the same HG setup and noticed no change. Average 20 at operating temp. The rich afr throws me off but the is a large vacuum leak somewhere, also has to do with pressure releasing so fast on the boost test.
    1995 M3 Alpine on Dove
    AA Stage 1 Turbo
    Porsche BBK
    Low & Slow

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