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Rich84 · 07-17-2018, 10:25 AM

The O2s appear to be functioning properly. The pcm goes into closed loop quickly. My tuner was not concerned with the heater circuit issue. He made it sound like it was throwing a code due to something he did or did not do with the tune.

Is it correct that the heater circuits are most important at startup to get the system into closed loop quickly ?

07-17-2018, 10:25 AM	#18
Rich84 Registered User Join Date: Mar 2012 Location: Woodbury, Ct. Posts: 1,665	Re: 6.0 Swap Stumbling Idle The O2s appear to be functioning properly. The pcm goes into closed loop quickly. My tuner was not concerned with the heater circuit issue. He made it sound like it was throwing a code due to something he did or did not do with the tune. Is it correct that the heater circuits are most important at startup to get the system into closed loop quickly ?