I have a 2008 IC bus with a VT365, it's blowing white smoke at idle and black smoke while driving. I have 4 injectors that are'nt firing, and a loud knock in the engine. My question is, will it smoke that much with 4 injectors out and have a loud knock? I just replaced injectors on a VT365 that had 2 injectors out and it didn't smoke or knock like this one does with 4 injectors out. I've never come across this kind of knock on a VT365. I hope someone can chime in. Thanks.