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Erratic RPM and Cam/Crank sensor issues.

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  • Erratic RPM and Cam/Crank sensor issues.

    I'm just finally getting my LSx swap up & running, and I'm having issues with Erratic RPM with CAM/Crank sensor issues. Engine starts & runs, just doesn't idle great due to this erratic RPM. With engine running, LED # 6 is red and # 7 blinks. With engine running Diag # 6 numbers climb quickly, Diag # 7 sits at 0, Diag # 1 stays steady at 1000000. Swapped in new GM CAM/Crank sensors to no avail. Swapped pin A & C on the cam sensor to no avail. Cam pins with key-on/engine-off read 12.4 on red, perfect ground on black, and 6 mV on purple. Not sure if I need to test this with the engine running or not. I'm at a loss here, any ideas?
    Attached Files
    Last edited by mrmumbels; 01-24-2023, 09:59 PM.

  • #2
    Contact Holley Tech Service (LINK).

    Originally Posted by Danny Cabral
    The Terminator X doesn't record System Logs because it's only capable of external datalogging (PC software or 3.5" TSLCD).
    If a regular datalog indicates an "RPM Error" when scrolling through the problem area, then troubleshoot why the crank or
    cam sync unit isn't transmitting a signal. Troubleshoot the crank & cam sensors, wiring, reference voltage & ground, reluctor,
    alignment, air gap (LINK), radial run-out problems (LINK), etc. Troubleshooting 3-wire Hall-Effect sensors:
    https://www.yumpu.com/en/document/read/ (Understanding/Troubleshooting Hall-Effect Sensors - "Troubleshooting", Page 2)
    https://www.team-bhp.com/forum/attac...e-beatbook.pdf (Fluke Multimeter Testing - "Hall-Effect Sensors", Page 17)
    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 crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM 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 Ford AOD, 10" 3000 RPM C6 billet 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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    • #3
      Thanks, calling now.

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      • #4
        Just wanted to add a resolution to this issue. Holley support had me disable the cam sensor to see how it would run without the ECU looking for a cam sensor signal. It ran great. I then started tracing out the pins for the cam sensor and found a short. I had shortened this cable, so I removed all the heat shrink and found absolutely nothing wrong with any of the wires, the short did go away though. I have no clue where it was, but it's fixed. At least I know what's wrong if it happens again.

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