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Thread: Intermittent Misfire Issue

  1. #1
    Join Date
    Oct 2015
    Location
    Gonzales, LA
    Posts
    17

    Default Intermittent Misfire Issue

    Hi guys. I'm trying to figure out a misfire that has become worse over he last few months. It's to the point now where I'm not even sure if I can make a clean pass down the track.

    The setup is a 408W SBF with LSx coil packs and a Price Motorsports cam sensor with an Innovators West crank trigger and Holley Hall-Effect crank sensor.

    If I leave closed loop on, it's much worse as the ECU tries to correct for the misfire. A while back, I was making a pass and it was a clean p**** until the final 1/8th when the car almost felt like it was shutting off and back on again. More recently, it misfired hard off of the line and I just sputtered and banged my way back to the pits.

    On the attached datalog, I have turned closed loop off and ran a system log to see if I'm getting crank or cam sensor errors. It looks fine to me, but you can clearly see the RPM dip. I'll try to get a regular datalog today to see what that tells me, but is there anything that looks off on this system log that I'm not seeing?

    It's so strange as the car will be running totally fine then suddenly it will just go nuts on me, then revert back to normal.
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