60k Spark Plug Change

[TRSCobra]

Just hit 60k miles in my 3.5EB and figured I'd change out the spark plugs. Really straightforward job. The original plugs looked pretty decent, with minimal ground electrode wear and only ~.003" increased gap over the brand new ones.

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[Mosey]

That does look good. Thanks for sharing.

 

[Samson16]

Does the dark coloration indicate a slightly rich mixture vs the tan color I’ve seen on plugs before?

 

[JExpedition07]

Does the dark coloration indicate a slightly rich mixture vs the tan color I’ve seen on plugs before?

Yes, in general light means lean and darker means rich. These plugs look totally healthy for 60k, indicating a good mixture.

 

[TRSCobra]

Used oil analysis doesn't show any excessive fuel dilution, and the truck regularly averages 21-22mpg per tank, so I doubt it's running rich.

 

[AutonomousHybridF150]

Used oil analysis doesn't show any excessive fuel dilution, and the truck regularly averages 21-22mpg per tank, so I doubt it's running rich.

Boosted vehicles always run rich on the OEM tune. Even with aftermarket tuning, boosted engines will always be slightly rich when generating max power.

 

[Gros Ventre]

The boost and enrichment for it occurs when the turbos are doing their thing. If you can stay off the gas pedal and stay off the turbos you'll see far less enrichment.

 

[SALEEN961]

The boost and enrichment for it occurs when the turbos are doing their thing. If you can stay off the gas pedal and stay off the turbos you'll see far less enrichment.

Agreed, the factory tune on my 3.5EB targets a default air fuel ratio of 14.08 to 1 and this is what you will see at lower loads. Under WOT, the targeted air fuel ratio can be as rich as 10.13 to 1. In catalyst protection mode, the air fuel ratio can be as rich as 9.57 to 1.

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