I ordered the tims tool with the spark plug air setup and the fitting that goes into the spark plug hole leaks... any idea what to do... I can not tighten it down anymore... please help asap

 

Have you tried some teflon tape on the threads?

 

it has to have the o-ring to seal

 

yeah still leaks with teflon and there is not a oring for the ls1 spark plugs

 

Um go to Autozone and buy their compression tester kit.... The gauge is removable with a quick disconnect air fitting. Remove the valve stem from int and vioala! You have your own air fitting. It uses and oring fitting as well. If you dont want to do that you could always just jam some rop in the cylinder the size of the spark plug hole and rotate the engine to TDC. This will crush the rope up against the valves holding them in place.

 

with the o-ring you just have to hand tighten. I just done mine last week. you have something wrong with the fitting