3.6 Carbon Buildup on heads just under 90k miles

[Shellbird01]

I’ve got some before n after pics. Todays are better. I learned how to turn the crank - 27 mm socket does it
P1 before

P1 after liquid seafoam thru brake vac

P1 after seafoam spray thru intake

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[Shellbird01]

P3 before (I know…)

P3 after liquid sf thru brake vac

P3 after sf spray thru intake

 

[Shellbird01]

P6 before

P6 after liquid sf thru brake vac

P6 after sf spray thru intake

 

[mwilk012]

Those pistons are fine. That amount of carbon buildup is perfectly normal.

 

[Shellbird01]

Those pistons are fine. That amount of carbon buildup is perfectly normal.

Thanks, appreciate that.

I’ve been getting pinging in the summer’s running lower octane, have you Dealt with that

 

[mwilk012]

Thanks, appreciate that.

I’ve been getting pinging in the summer’s running lower octane, have you Dealt with that

At idle or under load? Automatic or manual?

 

[mwilk012]

Has anyone considered pulling the spark plugs, soaking the piston heads overnight with fav carbon solvent, vacuum-out the next day and change the oil?

GM recommends this, it’s a perfectly good solution. I am very surprised to see Jeep come up with this ridiculous head removal tsb. Just put a good layer of your preferred solvent, then crank it over after a few hours. Change the oil immediately, of course.

 

[Shellbird01]

At idle or under load? Automatic or manual?

Automatic 3.6 in under load say around 3rdish gear on summer days

 

[Shellbird01]

GM recommends this, it’s a perfectly good solution. I am very surprised to see Jeep come up with this ridiculous head removal tsb. Just put a good layer of your preferred solvent, then crank it over after a few hours. Change the oil immediately, of course.

Might be dumb to ask, crank with plugs still out?

 

[mwilk012]

Might be dumb to ask, crank with plugs still out?

Yes, definitely. Don’t hydrolock the motor.

 

[Shellbird01]

Got to my 1st oil change with the catch can it’s

oily and milky I figure 3-4 ounces.
I’ve been running 91 and when it got to 80 deg today I thought I heard pinging in 3rd gear. Not sure where to go from here, I used 0w-20 but noticed the 2023 rental I had uses 5w not sure if that would help.

 

[mwilk012]

2 ounces is a quarter cup. That amount of oil isn’t even hitting the lowest mark on your measuring cup.

This is an insignificant amount of oil.

 

[Shellbird01]

Agree. Any opinion about the pinging.

 

[1BadManVan]

Agree. Any opinion about the pinging.

The pinging is definitely interesting if you’re still using 91 octane. Are you at sea level? Lower altitude you are, the more probable it can be.

We use 91 in our consistently with Mobil 1 EP 0w20 and so far zero issues

 

[Rodeoflyer]

I've heard the factory plugs are too 'hot' in this motor. I swear I saw a TSB regarding it.

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