1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Intermittent stalling, I'm stumped

Discussion in 'General Tech and Maintenance' started by jja2116, Jul 20, 2012.

  1. jja2116

    jja2116 New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Jul 20, 2012
    This is a B16B swapped into an 00' Si. Just completed it, had it running great, was traveling for 2 weeks and now I have a weird stalling problem, and sometimes hard starting.
    -If I give it gas very gradually it's fine
    -When I wind it up into VTEC no problems (plenty of power)
    -If I hit the throttle quick from idle or in the lower 1/2 of the RPM range sometimes it hesitates/stalls. If I take my foot completely off the accelerator it recovers immediately.

    The hard starting would make me think IACV, but the fact it stalls in the 2-4k rpm range makes me think it's something else, can IACV cause problems at partial throttle? I feel like the clue is in the fact it will be running fine and when the throttle plate opens quickly letting in more air it's like it doesn't fuel it correspondingly and just dies, but then sometimes it doesn't do it at all. TPS is fine, fuel pressure looks OK, No air blockages, No codes, plugs look great.

    I think the two clues are in the fact it sat for 2 weeks, and that sudden changes in throttle position cause this. Please help.
     
  2. Magana559

    Magana559 The Warden

    Messages:
    2,568
    Likes Received:
    42
    Joined:
    Aug 9, 2008
    Location:
    fresno Ca
    Time for a tune up, that would clear most factors.

    change plugs, cap, rotor, pcv valve and wires. Also clean out TB, IVAC, and IM. Check for vac leaks
     
  3. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

    Messages:
    30,024
    Likes Received:
    3,951
    Joined:
    Sep 28, 2002
    Location:
    CT
  4. jja2116

    jja2116 New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Jul 20, 2012
    I was hoping for some magical insight beyond completely overhauling all my ignition and fueling components, many of which were done as a matter of course with the swap already. I finally figured it out, the intermittence and duality was driving me nuts and pointing at something beyond the usual suspects. Turned out it was the MAP sensor, I had checked my sensor, but it was an issue with the connector, a bad contact was causing it to flake out, and flicker. Fixed the connector, all better. Thanks,
     
  5. civicious

    civicious FüK-VTEC VIP

    Messages:
    9,855
    Likes Received:
    629
    Joined:
    Jun 15, 2003
    Location:
    Houston, TX
    Hook up a scanner and monitor TPS and MAP voltage, and check fuel pressure with KOEO and KOER.


    edit: nevermind, looks like you already got it
     
Verification:
Draft saved Draft deleted

Share This Page