It is a 93-97 LT1 Firebird so no cam sensor. Right now, it still has the Commander 950 Pro FI system in it. Yes timing through the C950. But I have the Holley HP system here now. Hopefully within the next couple weeks I can start installing it. Going to order the 554-118 Hull effect crank trigger you suggested and the 558-431 Cam/Crank harness unless you have a better suggestion. I see they say to use the 558-306 universal harness. I don't see a harness that is just for the Hull Effect Crank Trigger. Unless I buy the universal unterminated 306 Harness and make one. Will it hurt anything to use the 431 and just leave the cam sensor connector tied back out of the way?
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Originally Posted by Robin Lawrence
There are a few possibilities here.
I am not a fan of the 2 wire magnetic crank sensor when triggering the Holley EFI.
I assume that you are running the timing through the Holley HP ECU.
I prefer the Holley 554-118 Hall Effect Sensor. It uses the same 4X Wheel and Bracket that you already have from MSD.
In the ignition configuration I would look at the settings for the crank sensor and the output to trigger the MSD box. The default signal output is 1.5ms. I have seen boxes that wanted more dwell time for the MSD box to trigger properly. Try 5ms and then 9ms if the 5 doesn't work.
Be sure that the crank sensor if setup to magnetic with the 2 wire MSD sensor and not digital.
Does this engine use a Cam sensor?
Robin
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