5.3 swap Camaro
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Joined: May 2018
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5.3 swap Camaro Hi, I just swapped a 2003 5.3l into a 78 camaro race car build that I'm doing. It's a standalone harness. Went to fire it up and no spark. Brand new ecm, crank sensor, coils, wires, and plugs. I checked each individual coil plug and I'm getting 12volts on one wire and the other 3 are grounds. I assume one should be a signal wire. I should not have 3 grounds unless I'm wrong? Traced all the ignition coil control wires back to the ecm. So the ground signal is coming from the ecm. Any info I can get on this is appreciated. I've been searching forums and google
for a week now and can't find anything on this.
for a week now and can't find anything on this.
Hi, I just swapped a 2003 5.3l into a 78 camaro race car build that I'm doing. It's a standalone harness. Went to fire it up and no spark. Brand new ecm, crank sensor, coils, wires, and plugs. I checked each individual coil plug and I'm getting 12volts on one wire and the other 3 are grounds. I assume one should be a signal wire. I should not have 3 grounds unless I'm wrong? Traced all the ignition coil control wires back to the ecm. So the ground signal is coming from the ecm. Any info I can get on this is appreciated. I've been searching forums and google
for a week now and can't find anything on this.
for a week now and can't find anything on this.
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Joined: Jan 2018
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From: Dade City, Fl.
Thread Starter
Registered User
Joined: May 2018
Posts: 4
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Thread Starter
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Joined: May 2018
Posts: 4
Likes: 0
I made the standalone harness myself using lt1 swap and bought the BP Automotive diy rework harness to wire it all up. I went through it wire by wire and made sure all the pinks were powered and wired according to BP Automotives instructions.
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On The Tree
Joined: Oct 2015
Posts: 105
Likes: 1
From: Amelia, Ohio
So you bought the harness already made from BP, then wired up the relays and fuses to put power to the harness? If so, you like wired up something incorrectly for the relays/fuses. I'd start there first. Draw up a diagram of the wiring you have right now, (Not the wiring from Lt1swap) so we can help eliminate that potential error. Then if the wiring looks sound, then you may have a harness issue that will need to be corrected with BP Automotive.
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