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No spark but I have power and ground ?

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Old 04-21-2019, 09:16 PM
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Default No spark but I have power and ground ?
Coils and injectors have power but won’t fire. Any suggestions besides a crank position sensor?
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Old 04-21-2019, 10:13 PM
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Check all grounds. I had a similar issues while back with a new 6.0l I put in a friends truck. Ended up being a ground on the driver side by the motor mount that never was hooked back up
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Old 04-22-2019, 08:44 AM
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Are you getting an RPM signal when cranking?
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Old 04-22-2019, 09:49 AM
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Originally Posted by LilJayV10
Are you getting an RPM signal when cranking?
I don’t think so , my gauge doesn’t move at all
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Old 04-22-2019, 09:52 AM
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[QUOTE=Drj8787;20084286]Check all grounds. I had a similar issues while back with a new 6.0l I put in a friends truck. Ended up being a ground on the driver side by the motor mount that never was hooked back up[/QUOTE

okay what if I grounded the block from battery and my other grounds (besides the one close to the starter ) I grounded to my fire wall ? Would that be the reason ? It still has a good bare metal to the fire wall and my battery is also grounded good to chassis
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Old 04-22-2019, 09:53 AM
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If you’re not getting rpm signal then it’s gonna be something to do with crank sensor. Could be the sensor it’s self or wiring even the reluctor on the crank
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Old 04-22-2019, 09:59 AM
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Originally Posted by Drj8787
If you’re not getting rpm signal then it’s gonna be something to do with crank sensor. Could be the sensor it’s self or wiring even the reluctor on the crank
i hope it’s not the crank! Hopefully it’s just the sensor . Does the sensor send the pcm a certain voltage ? If so what wire does this ?
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Old 04-22-2019, 10:10 AM
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Originally Posted by Cbmaddox33
i hope it’s not the crank! Hopefully it’s just the sensor . Does the sensor send the pcm a certain voltage ? If so what wire does this ?
whats the vehicle it’s in or came out of? I’m not sure if the signal wire is the same pin on different years and model
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Old 04-22-2019, 10:19 AM
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Originally Posted by Drj8787
whats the vehicle it’s in or came out of? I’m not sure if the signal wire is the same pin on different years and model
its around a 2002-2003 and a Tahoe
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Old 04-22-2019, 11:13 AM
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Originally Posted by Cbmaddox33
its around a 2002-2003 and a Tahoe
k it will be later today but I think I have the wiring diagram for the pcm and harness somewhere
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Old 04-22-2019, 11:20 AM
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Originally Posted by Drj8787
k it will be later today but I think I have the wiring diagram for the pcm and harness somewhere
okay I appreciate it man
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Old 04-22-2019, 11:42 AM
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Originally Posted by Cbmaddox33
okay I appreciate it man
do you know pcm you have?
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Old 04-22-2019, 01:22 PM
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Originally Posted by Drj8787
do you know pcm you have?
po1 I think and it’s red and blue connectors
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Old 04-22-2019, 02:22 PM
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Looks like dark blue/ white stripe will be the crank position signal
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Old 04-22-2019, 05:22 PM
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Originally Posted by Drj8787
Looks like dark blue/ white stripe will be the crank position signal
okay I appreciate it!
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Old 04-22-2019, 08:21 PM
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have to checked for DTC's? Are you able to data log it at all?
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Old 04-23-2019, 03:32 PM
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Originally Posted by LilJayV10
have to checked for DTC's? Are you able to data log it at all?
i have no tuner or anything, I can try to borrow a code reader , my check engine light is flashing also but I deleted egr stuff and maf is unplugged
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Old 04-23-2019, 03:34 PM
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Originally Posted by Cbmaddox33
i have no tuner or anything, can I use a code reader to find out ?
Yes a code reader should pull any PCM DTC's.

I see it's a LS swap. Has VATS been turned off?
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Old 04-23-2019, 03:35 PM
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Originally Posted by LilJayV10
Yes a code reader should pull any PCM DTC's.

Is this a LS swap project or OEM vehicle?
ls swap
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Old 04-23-2019, 03:54 PM
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Originally Posted by LilJayV10
Yes a code reader should pull any PCM DTC's.

I see it's a LS swap. Has VATS been turned off?
i new to all of this and it’s my first build , do I need a tuner to turn vats off ?
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