Need some help with an injector problem in my swap
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 66
Likes: 4
From: Pennsylvania
Need some help with an injector problem in my swap I have a 67 Camaro with an LS1. Engine,harness, ECU are out of a 2000 Trans Am. I just started it for the first time. I had it running about 15 minutes. Went to start it again and found my injectors are not firing. I put noid lights in the plugs and found if I move the harness going through the firewall to my ECU they would fire. I have 12 volts at each injector. It would seem that I have some sort of connection problem. I pulled the blue plug and checked continuity for the ground wires. That was fine. What wire or wires share a common bond with the injectors?
Check the 12v side also, and then check when you move the wires to see if it drops power or ground. Not sure how you have it all spliced or wired. 12v side is split to each injector and coil pack bank, per side.
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 66
Likes: 4
From: Pennsylvania
So I rechecked my voltage at the injectors again. My battery was at 11.7 volts. Each injector had 11.6 volts. Also checked when I cranked and everything stayed the same. My battery was getting low when I checked the signal. Each injector had around 9.6 volts while cranking.
Try a different battery or have it load tested.. might be a bad cell.
Hard to say without seeing the car how you have it wired. I ground everything, like double and triple grounds with 00 Cable
Hard to say without seeing the car how you have it wired. I ground everything, like double and triple grounds with 00 Cable
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 66
Likes: 4
From: Pennsylvania
It's a brand new odyssey battery. My main ground wire is 1 gauge if I remember correctly. Both heads grounded,block grounded frame grounded multiple places. I was **** about grounds...
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sounds like you got a couple things going on at once. i wanna see 12.5 in any decent battery. 11 volts can make ecm triggered relays act funny.
but a .1v drop to the injector aint bad.
what kind ohm drop do you get on the injector control circuit (from the injector to the ecm) ? affix your probes to each and and wiggle the harness and see of you lose continuity.
how's it run with a jump box connected?
but a .1v drop to the injector aint bad.
what kind ohm drop do you get on the injector control circuit (from the injector to the ecm) ? affix your probes to each and and wiggle the harness and see of you lose continuity.
how's it run with a jump box connected?
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Staging Lane
Joined: Sep 2018
Posts: 66
Likes: 4
From: Pennsylvania
So with untaping the harness and moving things around I can no longer get the noid lights to light when I crank it over. I did check continuity on all 8 injector wires and had a reading of 0 on all of them. I checked all of the wires on the blue ecu plug and have continuity to every one of them at their destination.
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 66
Likes: 4
From: Pennsylvania
So I checked the voltages on the pins in the picture. I have the values written along side of them. Not sure what pin#3 for the injectors should be? Pin#15 on the red connector, for the generator turn on signal seemed low too. I couldn't find what these values should be.
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 66
Likes: 4
From: Pennsylvania
I pulled the starter and checked the resistance on the crank sensor, obviously good. Put everything back together, when I cranked it over the noid lights lit. Had my buddy crank it over, moved the wires and they stopped. Pulled it apart and removed the conduit and found the signal wire damaged about 2 inches from the plug.