angus99
Guru
"I wonder how to tell if it’s carbon,"
Getting rid of carbon in the cylinder head is simple.
After a run with the engine warm , use a "flit" gun a hand held insecticide pump from decades ago filled with tap water.
Idle the engine about 1200-1500 RPM and spray tap water in the intake with enough volume that the engine stumbles , but does not stop.
The water steam cleans the carbon out , on a vehicle a piece of newspaper behind the exhaust will show the results.
Doing this before the next oil change is quick and simple.
Thanks, Fred. The higher pitched metallic rattling you can hear late in the vid above has got me wondering if it’s carbon.