It could be valves or piston failure. The cylinder head will then have to be removed to inspect the damage.
Roy
Mar 12, 2019 at 3:43 AM
STRAILER
CAR REPAIR CONTRIBUTOR
54,328 POSTS
Hello,
Here are diagrams and instructions on how to remove the cylinder head start by draining the coolant and disconnecting the battery. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Mar 12, 2019 at 12:14 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.