ive got 02 super crew with 140,000 miles on it should i replace them or wait till they start throwing codes or how ofter should they be replaced

 

I would wait until 1 starts acting up, then replace them all with OEM Motorcraft COP's

 

Wait ..

 

thanks

 

Depends on how it's running. If it's not running smooth and you have tried testing/cleaning/fixing/replacing everything else you can think of (like me), I'd say replace them. You can get 8 new ones off of e-bay for about $105 with shipping. Hopefully I get mine on Monday.