At how many miles does the opti-spark need to be replaced or normally go bad?

 

Usually, less than 1000 miles after it gets wet.

 

when i went to check out my camaro the detailer had messed the opti up by power washing the motor and it got wet. the car would not start, i was so pissed, but they sent it to their mechanic and i guess he cleaned it out or something but it ran fine after it came back.

 

Is it really a pain in the a$$ to change out?
Has onyone here done this?

 

It is not that difficult, but the water pump needs to be removed first. This is also a good time to put a new water pump in, because a bad pump will leak on top of the opty and mess it up and you will have to replace it again.