A couple days ago, about 10 minutes into a drive around town I started to hear a clicking noise in the engine. When I pulled it over and put it in park it was idling really hard but would mellow out as I revved it. I had it at one shop where they did a compression test (30 on 1 and 2, 170 on 3 and 4) and told me it was a blown head gasket and quoted me $500 for parts and 5 hours labor. Uh. No. Towed it to a Volvo exclusive shop and they called today to tell me very matter-of-fact that I'd thrown a rod in the engine, based on the noise alone.
I've been in contact with my trusted mechanic back home (I am a grad student going to school out of state) and he is baffled and unconvinced. As I understand it, throwing a rod in 240 is extremely uncommon.
My question is, what would cause a thrown rod in this car? And would this cause/these causes have had an warning indicators?
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