Cummins X15 after treatment issues

[marek4792]

Do you know if your exhaust manifold/turbo gaskets are leaking? These things are good about not leaving any soot behind when they leak. Unless you cold start your truck and spray it down with soapy water you'll never find them. I found one on mine and after removing the manifold found another I never knew about.. Just something to consider.. If removed check for heat cracks...