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Thread: start sputter, help

  1. #1

    start sputter, help

    6l l76 in g8 , supercharged lsa 1.9 blower ID 1050 injectors ,btr2 cam, 340lph fuel pump. runs great! good power , plugs gapped at .035 as per tune request (copper- dont remember heat br7?),no complaints except starting.
    running email tune by PatG.
    My problem:
    Cranks about right time before fires up, but then fires up and sputters a bit after starting. about half second to 1 second after fires runs smooth on all 8. cold or hot. Bit worse hot. 95%Always starts. missed a few on remote start. IF doesn't start, then have to clear flood start.
    No catalytic's, but can really smell rich fuel exhaust right after startup anytime its started: hot/cold
    Always start sputter= seems like a start with engine with few leaky injectors (. I'd love it to fire up like the newer gen 5 direct injected engines but realize it is unlikely/impossible. Those fire up real nice! )
    I have a wideband- but guess that's useless on cold starts, restarts.... as stoich is different. not to mention airflow in exhaust is almost non existent on start so wideband wouldnt be accurate

    Question is : how does one tune for cranking fuel? lower only that. Can i cut fuel for half second while cranking then enable? What tables should I be playing with for e38 ecm to lean cranking fuel a bit.
    - if that is even my problem.
    Like I said, runs great after actual start so don't want to mess with that part. running combined maf and ve tune.
    any help would be highly depreciated.

  2. #2
    Wow. nobody wants to take a jab at it?
    alright. I'll try to figure this out myself but still need help:
    Can somebody tell me if when cranking.: for CRANKING FUEL- table 12320 ...cranking fuel add amount .... does it default to the MAF table or the VVE table as base reference? The definition for cranking fuel as listed in HPtuners says FA ("fuel add multiplier" then mixes me up as it refers to "AFR") ?