hi all i am posting here because i cant get any help on any other forums and this seems like a forum with a ton of info! i have a 1990 300zx 5 speed 2 seater with t tops. the car has 174k. i had just bought it from a guy and it had a bad knock sensor and a bad fuel injector after replacing the injector one day, i went to fire the car up and i heard a clunk and it stopped. after that it doesnt try to turn over. id let it sit try again andit had tried to start then clanked to a stop again. i recieved a code 11 and had thought okay timing belt snapped s***, i took off only the drivers side cover and it all seems tight and the belt doesnt look old. i peeked under the upper passenger side cover and from what i can see the belt under there seems to be nice and firm to. so i then replaced the cas. still no start. i then read to test the cas by marking it and then turn the spindle and i should see the spark plugs firing( i pulled a plug and confirmed) and i should hear the injectors clicking which i do, if it does all this that would indicate a good circuit and CAS wouldnt it? i am stumped on this issue. i have reset the code 11 several times and it always comes back, the car is dead set on 11 but i have no clue. heres a video of the car trying to start, it doesnt even try anymore. battery is an expensive brand new aswell ptu was relocated and brand new from z1. also when i was turning the cas to show in the video it made a strange noise that i havent herd anyother time i had tried spinning it.

okay i dont know how to work the picture posting on here so ill put them on my facebook and make a link i guess:(
[fbvideo]
https://www.facebook.com/photo.php?v=841266499231262[/fbvideo]