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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.
have the OBD codes read you may have left a lead off somewhere the code reader should point you in the right direction , dont want to alarm you but if the timing belt breaks whilst engine running it will almost certainly cause some sort of damage so might not be as simple as no spark
The Galant has an interference engine, when the timing belt breaks the valves stop and the pistons strike them. At the least you need a new head. There is really no way to tell how much damage was done without tearing the engine apart.
Timing belts should be changed at around 60,000 miles on engines with timing belts-especially on 'interference engines', which are engines that, when the belt breaks while the engine is running, will at least damage the valves and sometimes even pistons. You do not say what engine or model car your Mitsubishi engine is, but most Mitsubishi engines are interference engines. Better safe than sorry.
Most timing belt suppliers recommend 50k to 60k miles for replacement. Your Galant has a interference engine meaning that if the belt fails your will incur major engine damage up to and including replacement of the entire engine.
So if you have over 60k miles on the car go ahead and change the belt, and while you have it apart replace the water pump.
Should be on your 2nd timing belt. If you have the 4cyl engine there is a balance belt that needs to be changed also. Mitsubishi recomends replacement at every 60,000 miles, your 10k over. Most of the time these motors are not interferance engines, But I have seen a few that broke a belt at high rpm that did bent valves......
Go to Google and put in Mitsubishi 4G63 or 4G64 assuming that is your engine type. You will find a number of sites from which you can download an engine manual for free. That will tell you exactly what to do.
However if you are not experienced in this type of work do not try it. It is not easy and if you make any mistakes you can wreck your engine.