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 4 of 4

Thread: Is 146 blm at idle too rich or too lean?

  1. #1
    Carb and Points!
    Join Date
    Apr 2018
    Age
    38
    Posts
    3

    Is 146 blm at idle too rich or too lean?

    I have an 89 Iroc-z that I replaced the L98 with a gmpp 350 H.O. I put in the ford 24# injectors. I used tunerpro to change the injector sizing. I was running really rich looking at the plugs but my ses light came on and threw a code 44 saying it had a lean condition. I know I need to be at 128 blms but not sure which direction to go. Thanks

  2. #2
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    3,719
    BLM's below 128 are rich.

    BLM's above 128 are lean.

    Typically BLM's between 123 to 133 are OK. Typically the closer the BLM is to 128, the better the engine runs.

    HINT: Lowering the injector flow from 24 lb down to 22 lb will make the computer think the injector is flowing less fuel than it actually is. When the computer thinks the injector is 22 lb not 24 lb, the computer makes the 22 lb injector work more to flow more fuel.

    I've said this many times before, there are three things to know about injectors:
    What an injector is rated to flow.
    What an injector is actually flowing.
    What injector flow is programmed into the chip.

    The reality is all three injector values can and usually are different.

    dave w

  3. #3
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    3,719
    Quote Originally Posted by dave w View Post
    HINT: Lowering the injector flow from 24 lb down to 22 lb will make the computer think the injector is flowing less fuel than it actually is. When the computer thinks the injector is 22 lb not 24 lb, the computer makes the 22 lb injector work more to flow more fuel.
    Ok, maybe what I posted above in quotes is confusing. Maybe the information below is less confusing.

    To lower the BLM's, lower the injector flow. If the BLM's are 146, lower the injector flow from 24 lb down to 22 lb.

    To increase the BLM's, increase the injector flow. If the BLM's are 108, increase the injector from 24 lb to 26 lb.

    dave w

  4. #4
    Carb and Points!
    Join Date
    Apr 2018
    Age
    38
    Posts
    3
    Thank you so much. I will change that.

Similar Threads

  1. Replies: 57
    Last Post: 09-08-2018, 02:58 PM
  2. Will AFR change from rich to lean by using ve table?
    By k4chevy383 in forum GM EFI Systems
    Replies: 2
    Last Post: 02-04-2018, 06:30 PM
  3. 94 TBI 350 C1500 rich idle help?
    By Raksj04 in forum GM EFI Systems
    Replies: 6
    Last Post: 08-26-2016, 06:39 PM
  4. Hello! Lt1 issues, rich but lean.
    By 92rslt1 in forum GM EFI Systems
    Replies: 16
    Last Post: 06-20-2014, 06:01 AM
  5. Very rich, no idle
    By 67Nova in forum TunerPro Tuning Talk
    Replies: 0
    Last Post: 05-05-2014, 07:57 AM

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
  •