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Re: Changed the whole head gasket on a 2004 Mitsubishi...
Compression test cyclinder may have cracked head or warped head .I think that car has an Astron motor from my memory which has an alloy head that can warp or crack if the engine has been overheated ?
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OK, you want to know if the 2004 Galant is an interference engine, because of a broken timing belt. Your car has the 2.4L engine, and its not quite an interference engine, but its very close. A broken belt MIGHT not have damaged valves when the belt failed. Your garage should be able to look at the valve gear and see if any valves are jammed. It's also possible to look in each cylinder with an endoscope camera for any valve damage. A new belt can be fitted, and the engine turned over to test compression. If there are problems spotted, then the head has to come off and the the damaged valves replaced.
Catalytic convertor is just an emission control device, It help eliminate harmful gases into our atmoshper,as for the engine knock it had nothing to do with it,
I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.
Both white smoke coming from the tailpipe and the engine temperature overheating are signs the cylinder head gasket is blown. You should have a block test performed to verify.
if there is no blueish smoke from the exhaust then the oil is leaking. if there is, then the engine is burning it. was a new head gasket installed? it should have been. was the head bolts properly torqued to specification. the mating surfaces (head and block) might have been gouged
it could also be the oil pan gasket, or the manifold gasket. if it's the manifold gasket, when you remove the manifold to replace it, take the time to clean out the mixing chamber. it'll be filled with gunk and cleaning will improve gas mileage.
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