The Chevy dealer recently replaced the intake manifold gasket in my
1993 S-10, 4.3L V6, engine code Z (that is, not the high output version) because coolant was slowly disappearing (but there was never any water in the oil, nor on the ground).The next morning after I brought it home, when I first started it up, it sounded as if I'd just changed the oil: it clattered for a second or two, then sounded normal.
Next morning, same thing. So, I changed the oil and filter, even though the dealer had done that as part of the intake manifold gasket job.
Next morning, same thing. And every morning thereafter.
A couple days later, the engine started making very bad sounds while driving at normal operating temperature. I took it back to the dealer (having driven it 300 miles since the gasket job), and they said it sounds as if I have a bearing in the bottom end going out. They offered to put a used engine in it and to split the cost with me. ("Without admitting any fault," they said.)
I think that they know they did something wrong. Does anyone have any ideas about what may have happened?
Thank you very much!