Timing Question?????
 

i have an s4 n/a and i just rebuilt the engine but i have one problem the timing marks or worn out how would i be able get the timing right. and i tried starting the car and the second time i cranked the engine over there was a loud ass backfire what does that mean ?????

The timing marks on the main crank pulley are worn? If you can't see the color of the mark, you should still be able to see the indentation where the marks are. If you install the pulley,the first mark (when rotating the pulley clockwise as seen from standing at the front of the car) is the leading mark and the next mark is the rear timing mark. You can get some paint, a marker, or fingernail polish to mark these again to make them easier to see under a timing light.

Ass for the back fire, I can only guess what would have caused it, but it could possibly be related to the misaligned timing of the engine.

ok thanks i did that and the engine doesnt start i have fuel spark and i have the timing as close as i can i dont know what else it could be because everything worked before i rebuilt the engine