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no spark, coils arent getting any power

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Old 07-29-15, 11:57 PM
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no spark, coils arent getting any power

just swapped in a s4 n/a motor and tranny, while trying to start the engine it cranks but doesn't turn over. while checking the leading and trailing coil power wires, my volt meter showed there was no power going to the coils.ive checked the main relay and grounds everythings seems to be good, am i missing something here?
Old 07-30-15, 07:12 AM
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no spark, coils arent getting any power

By "checked the main relay", do you mean you verified its clicking to activate, or you verified its inputs/outputs with a multimeter? Have you checked the fusing in the bay fusebox?
Old 07-30-15, 01:16 PM
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checked its inputs, and no, ive realized this morning ive overlooked a couple things, like grounding and checking the fuse boxes, i assumed since i snagged everything from the running donor car(chasis&ecu harness) that everything would still work, when it stops raining im going to check the fuses, Btw I am a newb to the rotary motor/scene and im using this car to learn, only problem with work and school its taken to long and will need it running by next week
Old 07-31-15, 10:15 AM
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Need help! checked all fuses and changed them, still nothing
Old 07-31-15, 10:30 AM
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If the main relay were working properly w/key to on then the Black/White wire and the Black/Yellow wire coming from it would have 12 volts each. Near the lead coil is a Green check connector w/4 wires and one of them is the B/W wire from the main relay. The B/Y wire can be found at any of the injectors.
Old 08-04-15, 10:12 AM
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fixed the problem thanks!
Old 08-04-15, 11:02 AM
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no spark, coils arent getting any power

Originally Posted by Rxchino
fixed the problem thanks!
Please state what was wrong to help others who search for this problem in the future.
Old 08-04-15, 02:50 PM
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overlooked a loose relay so i bolted that down and i grounded the alternator to the shock tower.
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