Generation III Internal Engine 1997-2006 LS1 | LS6
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No spark on #2,4,6, and 8

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Old 04-04-2004, 11:37 AM
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Default No spark on #2,4,6, and 8

Sorry if this is the wrong spot for this. Finished Head install, and right side is getting no spark. I swapped coils and injectors and nothing changed. I also tried a new o2 sensor. What should I try next?
Old 04-04-2004, 12:02 PM
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I am assuming that you made sure to plug the big connector back in? I did this once in my haste to fire her up!!! I would also check that connectors wiring. You could have broken/grounded one of the wires killing the signal to the coils.
Old 04-04-2004, 12:21 PM
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The big plug for the coil rail looks damage free. Should I pull out the wire from the loom and look for damage? Do any of the ground wires that attach to the back of the driver's side head affect this? They are bolted down, but maybe I damaged one of them.
Old 04-04-2004, 01:10 PM
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Look for a broken ground wire on the back of the heads.
Old 04-04-2004, 01:18 PM
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And then check your fuse panel. Each bank has a fuse, which feeds both the injectors and coils for that bank. Find it, replace it even if it looks OK, and re-test.
Old 04-04-2004, 04:33 PM
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Originally Posted by crainholio
And then check your fuse panel. Each bank has a fuse, which feeds both the injectors and coils for that bank. Find it, replace it even if it looks OK, and re-test.
BINGO! Nice call. 15amp fuse for right bank was toast. Replaced, and all is well. Of course, now I wonder what caused it to go. Guess I'll keep extras in the car.

Thanks to all that responded!
Old 04-04-2004, 05:24 PM
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Woo hoo! Glad it helped. Swapping an LS1 into an old chassis definitely gets you up close 'n personal with the wiring harness and 12VDC feeds.




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