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Old 02-19-2022, 02:52 AM   #1
Accelo
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Join Date: Mar 2015
Location: washington
Posts: 2,295
LS1 No start conditon

I purchased two of LS1 coil harness from Ebay some time ago. My motor was missing them when I purchased it.

This week I attempted to start the 1998 LS1 motor, for the first time, and immediately blew a 15A ignition fuse.
It turns out the harness were pined backwards (like they were assembled by looking at the wrong end of the plug) All coils were grounded at ign pin so they were all pulling 6 amps each and of course wouldn't fire any plugs this way.

I have sworn off of any electrical products purchases from eBay. With the column switches the lone exception. Too many junky products without any quality controls.

Good news is the system no longer blows fuses and I have spark and fuel.
Bad news is this evidently isn't the only issue and I still haven't been able to get the motor started.

This is a bugger as the tech that builds harness was unable to find the issue. Computer is powering up. Codes can be read. Coils are hot. Fuel pump comes on for three seconds and stop when the key is on. Fuel pressure is perfect. We have tried more than one computer, re-flashed the computer, confirmed the grounds, the system will flash a noid light, changed out the cam sensor. Has spark. Reading the motor temperature correctly.

Motor has a new stage 1 BTR truck cam other than the cam it's stock.

I am going to confirm the compression as an academic exercise tomorrow.
After that I am unsure what to do. ECM Harness Tech guy is working with me and answers all my questions and is very knowledgeable.

Scratching for anything about now.
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