2010 Burb Misfire

[intheburbs]

PB blaster, and let it sit overnight.

Last time I used it was when I replaced the shocks and struts of my Denali. All bolts/nuts came right off.

 

[solli5pack]

Not sure how well you can see it but found coolant on top of the intake valve on cyl 4..still digging.

 

[solli5pack]

Drivers side valve cover...I guess I should do both sides...Money is tight and I was hoping go get away with just the RH side

 

[donjetman]

That is the updated driverside valve cover.

You got a coolant leak into your crankcase.

After you find and fix the coolant leak, cleanup that valve cover (submerged in solvent) and reuse it. Do the same with the passenger side.

 

[solli5pack]

Well there you go..I can't believe this thing was actually running...Now how did it get in.

 

[Geotrash]

Well there you go..I can't believe this thing was actually running...Now how did it get in.

View attachment 402515

You’re always going to have coolant in the cylinders when you remove a cylinder head. You break the seal between the water jacket in the combustion chambers the moment you pull that head off… And coolant will settle in the cylinders.

 

[solli5pack]

Well there you go..I can't believe this thing was actually running...Now how did it get in.

View attachment 402515

I'm thinking most of that coolant spilled in when I took the head off. Cyl 4 is much cleaner than the others. That's the one that was misfiring with coolant on the plug.

 

[solli5pack]

You’re always going to have coolant in the cylinders when you remove a cylinder head. You break the seal between the water jacket in the combustion chambers the moment you pull that head off… And coolant will settle in the cylinders.

You're right. I'm gonna clean it real good, check for cracks and then drivers side tomorrow. I wish I had the funds to eliminate the AFM but that's not happening. Do you think I should inspect the lifters or just leave them be? I haven't had an issues with them in the past.

 

[solli5pack]

Check out the difference between left side and right side. Right side is the suspected failed side. Much cleaner thanks to the steam clean from the burning coolant. Another sign to look foe when you're chasing something like this.

 

[j91z28d1]

You're right. I'm gonna clean it real good, check for cracks and then drivers side tomorrow. I wish I had the funds to eliminate the AFM but that's not happening. Do you think I should inspect the lifters or just leave them be? I haven't had an issues with them in the past.

if you can do something with the afm, or at least inspect the lifters and replace the plastic holders. I'd hate to do all that work for a lifter to fail 6 months from now.

if you can't drop in new lifters and the holders, I'd atleast do the holders, and inspect everything. I've seen a YouTube of taking lifters apart but not sure if I'd do it.

oem afm lifters or I've read millings made the lifters for the oem, so they are the same quality. I don't know how true that is but millings seems to be accepted as a replacement. I've seen threads about using the no name Amazon/eBay ones and having to pull it right back a part.