Erratic RPM and Cam/Crank sensor issues.

[mrmumbels]

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.

[mrmumbels]

Thanks, calling now.

[Danny Cabral]

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)

[mrmumbels]

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?