[Harold_89_911]

I lost compression in my # 3 cylinder on my way to work. Pulled the head last Wednesday and found the problem. My big question is what could have caused this, so I can fix the real problem instead of just the consequence. The car is a 91 Saab 900 non-turbo with 180k miles. The ignition/fuel system is the Bosch Jetronic, which is very similar to the Motronic on my p-car. The engine ran for maybe a total of 15 minutes after I lost compression but I don't think that would have created the difference in deposits shown on the pics. Any expert combustion chamber deposit detectives here?