Take a look at WaitForSeconds. Then, assuming you want the timer to start from when the grenade is thrown, do something like:
In future, you should try scripting it yourself and then post if you have problems (that you can't find a solution for by searching). Otherwise you'll usually have your question tagged as 'write-my-code', and generally they're ignored.
answered Aug 25 '10 at 05:15 AM
Well i will be happy to right your code. But this may not work. But go ahead and try it.
If this does not work for you search up yeild wait for seconds but this should work. You have to code your own particle emiter though. So you got to do a bit coding yourself too you know.
answered May 09 '11 at 09:24 PM
Instantiate the grenade...
Particle Effect the grenade...