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Old 02-16-2019, 06:03 PM   #24
2014sierraAT
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Join Date: Aug 2018
Location: Fort Smith, Arkansas
Posts: 163
Re: Sudden LQ4 problem??

The truck ran fine even after changing the air intake. I had been wanting to change the harness anyway just to clean up the engine bay. In the fuse box that’s built into the harness there are 2 relays one for ignition and the other for fuel pump. You can hold your finger on the relay and feel it cycle when the truck idles up.
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