Holley Terminator No Start
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Teching In
Joined: Apr 2024
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Holley Terminator No Start Good Morning,
Ive been digging through forums and have found similar issues but nothing that has helped so far. Ive got a fully built LM7 I cant get to start and have done every bit of troubleshooting I can but to no avail. Holley Terminator x. One issue Im having in particular I dont know where to start, so heres what ive got:
All new engine components, I am 99% sure the engine is mechanically good but starting to second guess myself.
When cranking, the engine usually backfires but never starts.
Cam and Crank sensors flash blue and green indicating pulses seen, but regardless of crank position they both drop out after about 1 second and show no status at all?
Crank sensor has been replaced with AcDelco, havent replaced the cam sensor yet.
Verified all voltage, have run wires straight to the battery during testing
Have added grounds all over the place - frame to block, block to battery, battery to frame, etc etc
Have fuel and spark, verified coil order and injector sequence
Rpm at startup shows 150ish
It all seems to lie in the cam and crank sensor not staying on, when cranking for a few seconds continuously, occasionally they will momentarily light back up and it backfires once again but immediately drops out. Diagnostics 6&7 in the terminator x software indicate they both either count to 1 or occasionally make it to 2. I also see a sensor 49! caution in the program data table but cant find a reference to what that means
Ive been digging through forums and have found similar issues but nothing that has helped so far. Ive got a fully built LM7 I cant get to start and have done every bit of troubleshooting I can but to no avail. Holley Terminator x. One issue Im having in particular I dont know where to start, so heres what ive got:
All new engine components, I am 99% sure the engine is mechanically good but starting to second guess myself.
When cranking, the engine usually backfires but never starts.
Cam and Crank sensors flash blue and green indicating pulses seen, but regardless of crank position they both drop out after about 1 second and show no status at all?
Crank sensor has been replaced with AcDelco, havent replaced the cam sensor yet.
Verified all voltage, have run wires straight to the battery during testing
Have added grounds all over the place - frame to block, block to battery, battery to frame, etc etc
Have fuel and spark, verified coil order and injector sequence
Rpm at startup shows 150ish
It all seems to lie in the cam and crank sensor not staying on, when cranking for a few seconds continuously, occasionally they will momentarily light back up and it backfires once again but immediately drops out. Diagnostics 6&7 in the terminator x software indicate they both either count to 1 or occasionally make it to 2. I also see a sensor 49! caution in the program data table but cant find a reference to what that means
Last edited by mongose99; Apr 2, 2024 at 08:08 AM.
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Joined: Aug 2010
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From: Ann Arbor, MI
Have you used Sparkplug and Injector test lights to confirm they are operating while you crank?
We have had several posts about ACDelco sensors being "fake". When buying sensors from Amazon make sure they are supplied by Amazon and some "cheapoautoparts" vendor.
We have had several posts about ACDelco sensors being "fake". When buying sensors from Amazon make sure they are supplied by Amazon and some "cheapoautoparts" vendor.
Thread Starter
Teching In
Joined: Apr 2024
Posts: 3
Likes: 0
Sorry for the delay, still no go on anything and finally getting back to it. All spark plug/ignition coil wiring has been verified and the cheap harnesses have been replaced. Sensors have been replaced with genuine AC delco as well. I've narrowed it down to either some programming issue or maybe the cam timing is physically off. Any assistance is appreciated
