In the past few week I've been getting some black smoke from the exhaust at a cold start. It's a 2007 5.4 chipped with Cai and dynamax bullet exhaust. The truck runs fine and its not throwing any codes. Any ideas?

 

black smoke can be a rich indication. possible leaky injector?

 

Is there any way I can check the injectors?

 

bump

 

Pull plugs and look at them...