The replies from HMAC300 are not conducive to diagnosing your problem. This so called "Retired Mechanic of 40 years" may be one of those "Buyer Beware" type of mechanics that feed people a lot of speculative information DO NOT listen to him.
One of your plugs melted from that cylinder get too lean, **the piston should still be fine**.
The fuel injectors or (spider) on these engines can become faulty and go lean on some cylinders and rich on others. Also the feed and return lines at the injector can start to leak which will cause the engine to run rich, visual inspection will be required look for pools of gas under the fuel feed lines at the injector assembly.
Remove all spark plugs to hand turn the motor if you want to check if will turn over and not seized up.
Your no crank issues could be:
Neutral Safety Switch
Fusible Link (OR) Starter Relay to the starter.
To be completely honest people should never claim to be mechanics of 40 years (retired or not) if they can not give logical diagnostic feedback and not some half baked uneducated opinion of a backyard part swapper.
These are the types of people who will talk you into buying a new engine when it is not necessary.
Thursday, August 31st, 2017 AT 9:59 AM