I have a 1997 Chevy Cavalier 2.2engine,timing chain broke and I replaced it but the engine runs rough. I checked the compression and found that #1 has very low,#3 has no compression on #2 & #4 are good. What should I DO NEXT?
The good news is that this engine is not an interference engine so the likely hood that your valves are bent is very slim. I would look at the timing chain again. You can set the timing marks and them release the tensioner pin and it will influence the timing marks. The marks must line up with the tensioner pressure on it. You need to spin the motor over several times and recheck the marks afterwords before you put it back together.
The lack of compression is because the timing is off and the valves are partially open when they shouldn’t be.
*note* most of these timing chains break in this engine because the chain guide/tensioner have broken and the guide/tensioner should be replaced at the same time as the chain.