Just as the title says, is there a way to tell for sure. Everyone always says to replace plugs if there is a chance they could be fouled. Is there a way to tell for sure?

 

Just pull one of them and inspect. If it is wet or oil fouled then you know they're fouled. I have cleaned foulded plugs before with good luck.

 

You make that sound easy. I've tried, and they are tough to get to!

 

after doing it 3 or 4 times u'll b a expert

 

easier with the battery relocated and a front mount intercooler. the back ones top and bottom are still a pita to get to especially with big hands.. so basically if they look clean then just dry them off if they have gas on them and put them back in? ive seen a tester on ebay or autozone that has a light, but that doesnt really indicate if they are working 100% though