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420A Need MS3 help, No Fuel Issue

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midfb6

Proven Member
44
6
Jun 25, 2024
COHUTTA, Georgia
I've currently wired the ms3 to Injectors, TPS, coolant temp sense, IAT and my wideband 02 sensor in. During cranking it's a no start with injectors not firing. Key on it's receiving 0.3v-0.5v on the signal wires going to the ms3, the 12v red black wire that's connected to the stop pcm for power on the ASD relay isn't receiving the 12v, I am getting spark tho.

While cranking I do not see the rpm needle moving. First thought was cam or crank position, I put my stock cam sensor back in no change, currently have a crank sensor on order.

I do have 43psi fuel pressure and test spark with a screwdriver, and it does indeed shock you back to life haha.
Wanted some insight on if anyone has any ideas or thoughts if I'm on the right path or not.

PS. I did wire the injector as Bank1 Wire 1 Injector 1, Bank 1 Wire 2 Injector 4, Bank 2 Wire 1 Injector 2, Bank 2 Wire 2 Injector 3.
 
Last edited by a moderator:
Found out the asd relay is not keeping power to injector when crank not sure what it could be , jumped the relay to have constant power and was able to test in tuner studios and had them all click , Crank shaft postion sense is new tried swaping known good cam sensor in not sure what else to try.
Relay clickon for 3 second durning on postion then clicks off then when starting never kicks back on.
 
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