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Thread: Erratic Datalog Any Advice Appreciated

  1. #1

    Default Erratic Datalog Any Advice Appreciated

    New to the Terminator world. Little info about the car:
    '91 Fox body
    Terminator X TBI
    MSD Dual Sync
    MSD 6AL
    Blaster HV coil
    Ford Racing plug wires. (Possible issue with EMI/RFI?)
    347 Dart block
    Forged and balanced rotating assembly
    Vortech Si trim
    190cc heads
    Dual-plane RPM Air-Gap
    50/50 Water/Meth injection
    Autolite 3923s gapped at .030"
    Shorty headers with H-pipe
    Anderson B-31HR Cam (Mild, boost cam, lays over around 6700 RPM.) 216°/224° duration @ .050"
    LS style Lunati valve springs.

    I'll attempt to attach a datalog, if it does not work please let me know.

    Multiple things in the datalog seem to fluctuate up & down rapidly in the datalog. Car has less than 500 miles since the build. Everything is brand new. The biggest concern is the AFR trace and the RPM trace.

    I have checked for exhaust leaks three times, with soap & water on the last two. It is nice & tight. No leaks. I'm on my third set of plugs. Which all have read decent when they come out. I've swapped WBO2 with a known good sensor off a friends car with the same results. I'm on my second set of plug wires. And second cap & rotor.

    During the datalog I attached, car felt great. No noticeable skips. Nice & smooth.

    Holley harness is well separated from anything that could cause EMI/RFI.

    Terminator is hooked directly to battery in trunk.

    Closed Loop Advance Control is set to 1. I thought maybe the Closed Loop was chasing itself. But I don't know if I can just turn it off as my Base Fuel Table isn't quite perfect yet.

    I've been trying to dial in the Base Fuel Table, but with the erratic AFRs I'm kind of at a loss as I don't want to run lean.

    I appreciate all the advice on this forum. It has definitely helped a ton! Thank you in advance!

  2. #2


    Forgot to mention, the only other odd thing that happens. I have a dual electric fan setup. Both controlled individually by Painless Wiring 40 amp relays, ground triggered by the Terminator. However, when I cycle the key, they come on for a split second. Barely long enough to make then turn 1/2 a revolution. Not sure if this is related.

    I'm well grounded I think, I have one from engine to chassis. Chassis to battery. Engine to battery. Engine to firewall.

    Also, I have installed a separate relay in the truck to power the fuel pump, as I read that the fuel pump relay in the Terminator harness can sometimes cause an issue. Now I'm using the Holley relay to trigger another relay to power the pump.

    In the past three weeks, I have replaced the header gaskets, welded in a new WBO2 sensor bung in a different location, installed a new WBO2 sensor, and installed the Innovate Motorsports heat sink that Danny Cabral suggests. Still doing the same thing.

  3. #3
    Join Date
    Dec 2009


    I suggest someone to help you with a GCF (Global Configuration File) consultation, or by means of a remote tuning session (after installation), I'd contact Andrew B. @projectgattago, Chris Myer at or Richard Nedbal (FastManEFI) at We'll also need to see your Config File.

    Originally Posted by Danny Cabral
    For further assistance, post your Config File and a short datalog of this occurrence for us to analyze.
    Also, review the datalog and inform us of exactly where in the datalog (time/seconds) the problem occurs.
    Datalog & Global Files can be linked to a document hosting website. I use
    Files can also be "zipped" (compressed zipped folder) & attached directly to a forum post ("Go Advanced" & "Attachments").
    Your Config File is in the "Documents", "Holley" folder, "Terminator X" folder, "Global Files" folder (.hefi file).
    Your Datalogs are in the "Documents", "Holley" folder, "Terminator X" folder, "Data Logs" folder (.dl file).
    Someone will analyze/troubleshoot the problem & offer advice. (How To Record & Email A Datalog)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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