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Re: HELP!!! Intermittent spark 2002 suburban 5.3
I checked the trigger pulse with an LED that I had laying around, good consistent pulse. So I changed coil packs again with a known good coil, and #1 is still firing less than half the time. Looked at grounds, g103, g104, and g105 all appear to be in good shape. I also ran a temporary ground from the bank 1 pigtail to neg terminal with no change. I pulled most of the looming off of the harness with no frayed/broken wires found. I Forgot to mention in the original post that the other reason I thought ground issue is some random dash lights that come and go including ABS, brake, and Service 4wd.
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68 3/4 ton  (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged  build thread
41 3/4 ton (wife's)-flatbed, fully restored to original
01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's
02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's
Last edited by Jacfourteen; 11-08-2022 at 10:54 PM.
Reason: new diagnostic info
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