2008 5.3 rough idle

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05-05-2018, 10:33 PM

#11

FFDP

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No, those trims are well within the norm. Getting within 5% of zero with a cam a is great at idle if you ask me. A higher idle at 750-800 seems like it could help though.

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05-06-2018, 12:20 AM

#12

rennat_2006

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I will give that a shot.

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05-06-2018, 06:28 AM

#13

madmann26

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How does it idle in SD mode?

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05-07-2018, 10:43 PM

#14

04gibbstahoe

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Are you getting a check engine light? Could be a vacuum leak.

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05-07-2018, 10:55 PM

#15

rennat_2006

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I will unplug the maf and see how it runs

No check engine lights and no vacuum leaks

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05-08-2018, 08:12 AM

#16

smokeshow

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Enriching the idle AFR can smooth things out. You'd just increase your O2 sensor switching voltage in the idle airflow mode cell(s). I'd start with something like 600-750mv and see how it feels.