What happens when I run too much ethanol?

Discussion in 'Generation 4 - General Discusson' started by b4black, Feb 11, 2019 at 4:43 PM.

  1. b4black

    b4black New Member

    Joined:
    Dec 7, 2012
    Messages:
    24
    Likes Received:
    15
    Location:
    IL
    Car is stock for now. I sometimes run ~E30. I notice the LTFTs going up, but not that much.

    I was told not to run more than E30. What is the first sign of running out of fuel? The LTFTs or low fuel rail pressure, or AFR at WOT??

    Just wondering what to what to look out for.

    Thanks!
     
  2. 6500rpm

    6500rpm Quality Always Shoots Straight

    Joined:
    Jun 21, 2016
    Messages:
    315
    Likes Received:
    345
    Gender:
    Male
    Occupation:
    Journeyman Fleet Tech
    Location:
    The safe zone outside metro St Louis
    I'd be guessing fuel trim should go up and possibly set a p0171 code. Not sure what effect it has on non FlexFuel fuel pump and related items long term.
     
    SHOdded likes this.
  3. SM105K

    SM105K SHO Member Supporting Member

    Joined:
    May 3, 2018
    Messages:
    752
    Likes Received:
    647
    Gender:
    Male
    Occupation:
    Paper Slayer
    Location:
    Arizona
    I run between 30 and 40 percent. However, I have an E30 tune. You can run into low rail pressure, esp in colder climates.
     
    SHOdded likes this.
  4. b4black

    b4black New Member

    Joined:
    Dec 7, 2012
    Messages:
    24
    Likes Received:
    15
    Location:
    IL
    I'll be tuning this engine myself. I'm sure I can get the LTFTs back in line. Sounds like I should log fuel actual and desired rail pressure. (Maybe fuel pump duty cycle as well.) When the actual pressure can't keep up, it's time for more fuel pump.
     

Share This Page

If you wish to help keep SHOforum running, please click the donation button below