Thoughts on these spark plugs?

[M32H32IS]

Pulled my plugs to chase down a misfire. I’m not sure what the coloration means, can someone help me figure this out?

Cyl 6 has a small amount of liquid that smells like fuel. I’m guessing I’ve got a leaky injector…

 

[ktm525]

Champion? Throw them away and put in the proper OE plugs (NGK) or Denso. No stupid multi ground gimmick plugs either. Good chance your misfire goes away with the proper plugs. *** is wrong with people? I barely trust them in my mower lol.

 

[djkaosone]

I agree @ktm525... Champions are terrible. I personally prefer Denso over NGK, but that's my personal preference. I like the Denso Long Life, but you'll have to gap them to 0.040". Otherwise, they're pregapped.

Get new plugs in and see if the misfires go away.

 

[M32H32IS]

10-4 I’ll order a new set and report back after some driving.

 

[M32H32IS]

Should I reset adaptations with my GAP tool so the CPU “learns” the new firepower?

 

[ryanjl]

While not excessively difficult, the spark plug job on an LR4 isn't exactly a breeze, either. Boggles my mind that someone would go through the trouble of changing the plugs but use the wrong parts.

 

[M32H32IS]

While not excessively difficult, the spark plug job on an LR4 isn't exactly a breeze, either. Boggles my mind that someone would go through the trouble of changing the plugs but use the wrong parts.

A lot of the work done by the shady car dealer who sold this to me was mind boggling.

 

[ktm525]

How many miles on your rig? Those plugs have been in there awhile and we know they are at least the second set (not original).

 

[powershift]

They look good. You want them to be tan as that indicates the correct air:fuel mixture. If you smell fumes there is a leak somewhere.

 

[djkaosone]

Should I reset adaptations with my GAP tool so the CPU “learns” the new firepower?

I would check out the Live Values on STFT and LTFT on both bank 1 and bank 2 after swapping in the new plugs. IF both banks are really off and/or +/-10%, then yes I would Clear Adaptation Values to reset the ECU into learning mode.

I personally would Clear Adaptation Values when changing sensors like O2, Map, Maf, Crank position, Throttle position, or ANY sensor that has to do with timing and/or fuel curves. Reseting the ecu will force relearning fuel curves over a few drives and few days.