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Doesn't explain why it goes away when unplugging the coil but the V6 in these cars has a high pressure fuel pump that I believe is mounted in the rear of the driver side cylinder head and it makes one hell of a tick because its generating over/around a thousand pounds of fuel pressure. It is driven off the camshaft. I noticed it pretty readily on my 2012 V6 I had.
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2015 Camaro 2SS/RS SIM
2016 Jeep Wrangler 2DR Willys Wheeler
1993 C1500 Single Cab Stepside 5.3L LS Swap
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