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07-18-2017, 08:19 PM
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#1 |
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Registered User
Join Date: Sep 2016
Location: Downingtown, PA
Posts: 53
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Help! Ls coil issue
I recently did an ls swap on my 72 blazer. It has a 02 5.3l out of a burban and I have a bp wiring harness. Shortly after I got it running I got an error code for coil c primary/secondary issue. I pulled the wire off the plug and used a new plug as a test to ground. Cylinder 3 has little to no spark. Moved the spark plug wire with the plug to cylinder 1 and it had great spark. So I swapped coilso on 1 and 3 and retested with the same results. Also when the issue started I swapped all the coils and brackets from another truck and same issue. I tested the light blue and pink wire at the coil harness connector and I have over 13 volts. I'm lost on whereach to go from here and I was planning on taking it on a trip this Friday. What am I missing?
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Anthony 1972 K5 4x4 1969 Camaro SS 1987 Grand National 1985 Cutlass |
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07-18-2017, 09:44 PM
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#2 |
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BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,255
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Re: Help! Ls coil issue
Sounds like a wiring problem since you swapped coil and works fine on another cylinder.
Clint
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1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress |
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07-18-2017, 11:31 PM
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#3 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: Help! Ls coil issue
I've seen a few "0411" PCM's with bad coil drivers set primary/secondary codes, PCM replacement fixed them.
This where a Lab Scope/oscilloscope comes in handy! |
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