ltklein
Full Member
So....I have had this 2012 Avalanche since new (2nd one). It's now at 86,000 miles.
I'm having the same symptoms that are regularly reported for 2011 and earlier Avalanches, however the TSB for this issues ends with early 2011's.
Now the story...
Last summer had a misfire in #7. Pulled the plug and half the porcelain was missing. Looked into the cylinder...all looked good. Replaced the plug and life was good.
At this point I was oblivious to this being a chronic issue with AFM engines.
Over Christmas, replaced all plugs - including #7. All plugs looked great except for #1 which was oil fouled around the base.
Still oblivious to the TSB, I elected to pull that plug again in a few months and see if it's still an issue.
So, here we are now... pulled #1 and it's oil fouled.
Pulled the left valve cover last night to see if it is the correct one that's supposed to fix these issues. It is...
NOT pulling oil pan to see if the spray deflector is installed there...that issue allegedly was corrected starting int he 2010 model year so I have to assume it's in my engine.
I have an exact set of issues that match the TSB, but apparently the fixes are built into my motor.
The only step I feel I have is to get the **super expensive ($90!!!)** top engine cleaner recommended by the TSB, and put the 4.5 ounces in each cylinder for 2.5 hours and see if that frees up the oil ring in Cylinder 1. The only other thing I've seen done is a factory replacement of rings and pistons.
Being 8 years old I'm clearly out of warranty.
Has anyone else with a 2012 or 13 seen these symptoms? I only found one on the web and he got an engine replacement paid for by GM.
Any other thoughts on this? Engine is way too young for this type of issue!....
I'm having the same symptoms that are regularly reported for 2011 and earlier Avalanches, however the TSB for this issues ends with early 2011's.
Now the story...
Last summer had a misfire in #7. Pulled the plug and half the porcelain was missing. Looked into the cylinder...all looked good. Replaced the plug and life was good.
At this point I was oblivious to this being a chronic issue with AFM engines.
Over Christmas, replaced all plugs - including #7. All plugs looked great except for #1 which was oil fouled around the base.
Still oblivious to the TSB, I elected to pull that plug again in a few months and see if it's still an issue.
So, here we are now... pulled #1 and it's oil fouled.
Pulled the left valve cover last night to see if it is the correct one that's supposed to fix these issues. It is...
NOT pulling oil pan to see if the spray deflector is installed there...that issue allegedly was corrected starting int he 2010 model year so I have to assume it's in my engine.
I have an exact set of issues that match the TSB, but apparently the fixes are built into my motor.
The only step I feel I have is to get the **super expensive ($90!!!)** top engine cleaner recommended by the TSB, and put the 4.5 ounces in each cylinder for 2.5 hours and see if that frees up the oil ring in Cylinder 1. The only other thing I've seen done is a factory replacement of rings and pistons.
Being 8 years old I'm clearly out of warranty.
Has anyone else with a 2012 or 13 seen these symptoms? I only found one on the web and he got an engine replacement paid for by GM.
Any other thoughts on this? Engine is way too young for this type of issue!....