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Hello and thank you for using Just answer! I'm Billy and i will assist you with this. Feel free to ask if you need any further info.
Given the reasons, the symptoms and the fact that you have an "interference engine"......meaning that valve to piston damage is most likely if belt breaks.............i would say that you have valve damage (and possibly pistons) causing this......however,
To confirm, you can check engine compression (as if timing is off, all cylinders must still retain same compression), and you may check the timing marks, make sure the timing is good, or not....
Here are the marks, so you check accordingly:
The marks are timing marks (while lines) on belt itself, to coincide with marks on covers etc....
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