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Thread: Hey, no start
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09-01-2014, 11:14 PM #1
Hey, no start
Helped a friend with a motor swap, bought it with a blown motor. We've got it cranking and assuming fuel, but not getting spark. Pulled off the icm plug, got 12v from the left (red) wire, white is next (should pulse when cranked over correct? But its not) Then black (ground) and cant remember the forth. Any ideas of troubleshooting or a good write up?
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09-02-2014, 12:21 AM #2Xtreme Member
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- Apr 2012
- Name
- Cameron
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- 1994 Formula
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White wire should pulse 1-4 VAC when cranking, If i remember right that's the signal wire from the opti. There should be 2 12v wires for the Coil, ground and white signal.
Opti Test is alil more than halfway down
http://shbox.com/1/4th_gen_tech2.html2012 Sierra - 5.3, Summit "Stage 1" Truck Cam
1994 Jimmy - LS? LT? 4wd? AWD? Time? Money?
1994 Formula - 5.3, Terminator X, Billet VS7875, "Best Cam", T56, QP 9"
Formula Build Thread
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09-02-2014, 01:30 AM #3
Ok, im on course. Id think its not the opti because its brand new. But prob worth a test
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09-02-2014, 02:26 AM #4Xtreme Member
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- Cameron
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- 1994 Formula
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- Dover, De
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- 2,076
Did you use a new opti harness too?
2012 Sierra - 5.3, Summit "Stage 1" Truck Cam
1994 Jimmy - LS? LT? 4wd? AWD? Time? Money?
1994 Formula - 5.3, Terminator X, Billet VS7875, "Best Cam", T56, QP 9"
Formula Build Thread
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09-02-2014, 10:34 AM #5
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