89 5.7 running rich

Discussion in 'Engine Performance + Maintenance' started by 001pewter, May 14, 2019.

Sponsored By: Car Parts
  1. 001pewter

    001pewter Newbie

    Messages:
    32
    Likes Received:
    4
    Joined:
    Mar 28, 2019
    Location:
    Louisiana
    5.7 is idling pretty bad and smells like gas out of the exhaust. No check engine light and the last time I changed the plugs they smelled like gas. Any common problems with these or any suggestions on what to check out. Tia.
     
  2. JackE

    JackE I'm Awesome

    Messages:
    528
    Likes Received:
    266
    Joined:
    Oct 1, 2018
    Location:
    Nevada
    Check the spray pattern on the injectors and the fuel pressure regulator. There are very few ways for too much gas to get in there.
     
  3. evilunclegrimace

    evilunclegrimace I'm Awesome

    Messages:
    451
    Likes Received:
    139
    Joined:
    Sep 18, 2017
    Location:
    pennsylvaina
    Check for stored codes, Get engine to op temp and hook a scanner up and watch your fuel trims ( Block Learn less than 118?) and O2 sensor( fixed above .7 volts for more than 50 seconds in closed loop?) check your timing (0 degrees with EST by pass disconnected), check your fuel pressure, is it to high? ( 9-13 psi is spec) Disconnect the MAP sensor and see if the rich condition clears up, check for leaking fuel injectors, is the fuel pressure regulator leaking? ( fuel in the vacuum line to the regulator?) faulty TPS? Check your canister purge to see if it is saturated.
     
  4. evilunclegrimace

    evilunclegrimace I'm Awesome

    Messages:
    451
    Likes Received:
    139
    Joined:
    Sep 18, 2017
    Location:
    pennsylvaina
    Actually there are quite a few causes for excess fuel. See code 45 Rich exhaust indicated diagnostic aides Section 3 Page 68 in the Fuel and emissions Service manual:waytogo:
     
    JackE likes this.
  5. JackE

    JackE I'm Awesome

    Messages:
    528
    Likes Received:
    266
    Joined:
    Oct 1, 2018
    Location:
    Nevada
    I kinda agree with that. There are a bunch of things that can cause the problem, but only a few ways for the excess fuel to get in the door. I was suggesting to check those doors first to see where it's coming from, then you can narrow the field to who is opening the door.
     
  6. 001pewter

    001pewter Newbie

    Messages:
    32
    Likes Received:
    4
    Joined:
    Mar 28, 2019
    Location:
    Louisiana
    Thanks guys for the info, I'll check what I can, kinda limited with no diagnostic tools. I tried the jumper wire in the port and it only showed code 12, if I read it right. The trucks been sitting for years after I had a bunch of problems out of it. Finally decided to put a new cluctch in and fuel pump.
     
  7. 001pewter

    001pewter Newbie

    Messages:
    32
    Likes Received:
    4
    Joined:
    Mar 28, 2019
    Location:
    Louisiana
    Spray pattern looked good and disconnected the map sensor and it ran a little worse.
     
  8. randomguy

    randomguy OBS Enthusiast

    Messages:
    87
    Likes Received:
    25
    Joined:
    Feb 25, 2018
    Location:
    Oregon
    If it’s been sitting the gas could be bad and not burning.

    Have you gotten it up to operating temp and driven it at highway speeds?
     
  9. 001pewter

    001pewter Newbie

    Messages:
    32
    Likes Received:
    4
    Joined:
    Mar 28, 2019
    Location:
    Louisiana
    I put a new fuel pump in it, twice, and it has good gas. I've got it up to operating temp but haven't driven it at highway speeds.
     
  10. 001pewter

    001pewter Newbie

    Messages:
    32
    Likes Received:
    4
    Joined:
    Mar 28, 2019
    Location:
    Louisiana
    When it's first cranked and idled up it runs fine, none of the gas smell and slight smoke. If I turn the a.c. on it really bogs it down.
     

Share This Page