Results 1 to 5 of 5

Thread: Deceleration RICH condition?

Hybrid View

  1. #1
    Mitsu booster
    Join Date
    May 2016
    Location
    Brighton MI
    Posts
    46

    Deceleration RICH condition?

    Hey guys, So I have this tune basically where I want it, pulls strong up top, part throttle, I am still getting my idle and cruise misfire when below 12inHg of vacuum, AFR on wideband doesn't seem to pick it up fast enough, if that makes sense, But I am starting to think its a RICH misfire, however on deceleration the car seems to actually get richer, rather than lean out and do the gurgle/popping, my question is in MPTune, what tables exactly control the deceleration fuel shutoff? it runs rich on decel and then sometimes it stalls, sometimes not but I believe it to be loading up on fuel causing it to stall, cause it usually has a rich fuel smell at a stop, I have verified that VSS is reporting correctly via scan tool, and O2 feedback is normal. Sometimes at idle it also will oscillate between 11.5-15.5 and usually have to blip the throttle to put it back in its place, but that doesn't always work either. I have a couple videos I can post if I can figure it out, otherwise ill just upload to youtube and post the link. Any suggestions would be appreciated, thanks

  2. #2
    turbo addict
    Join Date
    Dec 2005
    Location
    Mesa, AZ
    Posts
    7,351

    Re: Deceleration RICH condition?

    FuelBaselineFromMap is used when no throttle is applied.

  3. #3
    Mitsu booster
    Join Date
    May 2016
    Location
    Brighton MI
    Posts
    46

    Re: Deceleration RICH condition?

    Quote Originally Posted by tryingbe View Post
    FuelBaselineFromMap is used when no throttle is applied.
    checked out my cal in that section, it pretty much looks like the stage IV maps and most of the TSMEC cals, so I guess it must be something else?

  4. #4
    turbo addict
    Join Date
    Dec 2005
    Location
    Mesa, AZ
    Posts
    7,351

    Re: Deceleration RICH condition?

    Quote Originally Posted by 89CaravanFan View Post
    checked out my cal in that section, it pretty much looks like the stage IV maps and most of the TSMEC cals, so I guess it must be something else?
    Why not just adjust your cal and see what happens?

  5. #5
    turbo addict
    Join Date
    Dec 2005
    Location
    Spokane, Wa
    Posts
    9,046

    Re: Deceleration RICH condition?

    yep, I was able to tune that table to shut the fuel completely off above a certain vac level. Takes all the popping on Decel out which even though I liked it made the car more stealthy, gave it slightly better engine braking and a slight fuel savings. It'd keep the injector pulse width at zero until about 1300rpms on decel when the vac would rise enough to turn the fuel injectors back on.

Similar Threads

  1. Spirit R/T smoking under deceleration
    By Wastelands Warrior in forum "I need help!"
    Replies: 9
    Last Post: 04-24-2019, 10:56 AM
  2. Lean out on deceleration
    By tryingbe in forum EFI Tuning
    Replies: 8
    Last Post: 06-04-2011, 10:53 AM
  3. Effect of rich condition on EGT?
    By guyd_15 in forum Exhaust
    Replies: 14
    Last Post: 11-02-2006, 09:02 AM
  4. Popping During Deceleration
    By Tony Hanna in forum Exhaust
    Replies: 38
    Last Post: 07-31-2006, 07:59 PM

Tags for this Thread

Posting Permissions

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