my friends 00 si won't start, it has fuel, and spark, but for some strange reason it doesn't start, it turns over and sparks and there's fuel leaving the return line, but it just won't start, any other suggestions?

 

the timing is off, see if it skipped a tooth

 

an engine needs...

compression

timing

fuel

spark

.. if its missing one, it wont start. if it has fuel and has spark, check the timing, if the timing is factory, check your compression...

also, if your coil is out, it will still allow the spark to jump the gap on the plug, but loses its spark under compression... check and make sure the coil is good... if its got any black/brown spots... it got no sparky