Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Results 1 to 7 of 7

Thread: Questions about first data log.. $6E

  1. #1
    Carb and Points!
    Join Date
    Feb 2013
    Posts
    7

    Questions about first data log.. $6E

    With my first data logging session with TunerproRT under my belt, I am trying to understand what I'm looking at and what I'm looking for. I figure before trying to tune I should be sure that everything is mechanicly sound.

    1984 GMC
    Stock manifolds
    2.5 true duals into flowmasters
    LB9 420/443 rv cam (I think, there seems to be some controversy)
    180* thermostat
    89 prom no emissions
    exterior fuel pump, adj. fpr (50lbs at the rail)
    700r4 .373 rear gears (30" tire)
    new bosch 3s and regulator

    My BLM's stay in the 150 range at Idle. At tip in they come right down to the 130 range. At cruise they are around 150 again. When decelerating they come right back to around 128.

    Is this lean enough to cause damage?
    Might I have a fuel delivery problem?
    I have checked for vacuum leaks.

  2. #2
    Fuel Injected!
    Join Date
    Apr 2012
    Location
    West Richland, Wa
    Age
    36
    Posts
    143
    Are you saying you have 50psi of fuel pressure? Or capable of?

  3. #3
    Carb and Points!
    Join Date
    Feb 2013
    Posts
    7
    Yes..I have about 49.5 with vacume off of regulator..
    I know stock should be 43.5, but I tried turning it up to see if it would bring the BLM's down...It didn't work.

  4. #4
    EFI GearHead ! EagleMark's Avatar
    Join Date
    Feb 2011
    Location
    North Idaho
    Age
    57
    Posts
    10,477
    What ECM/PCM? What mask? Where's the log?

    Is 150 lean enough to casue damage? Yes if your max BLM is 150! No if your max BLM is 170...

    Tip in BLM coming down could be from AE. Decelerating coming down to 128 sounds like Open Loop Decel/DFCO.

    Any exhaust leaks before or close to O2 sensor and WHAM, BLM no good.

    There' also a lot of fuel pressure gauges that are off.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  5. #5
    Carb and Points!
    Join Date
    Feb 2013
    Posts
    7
    Sorry about the lack of info..This stuff is all new to me.

    It's a '165 with $6e.

    No exhaust leaks. Fuel pressure was checked with 2 different brand new gauges.
    I'll post up the log ASAP (it's my laptop at home, I'm at work)

  6. #6
    Carb and Points!
    Join Date
    Feb 2013
    Posts
    7
    Thanks for your patience..

    Regarding an exhaust leak..If there was one, it would actually create a rich condition because it would think it was lean..Correct???
    My exhaust stinks lean not rich. It sticks to your clothes.
    Could the timing being off cause high BLM also?

  7. #7

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •