09-16-2014, 06:28 PM
Check for a boost leak or bad boost sensor. I think lower boost may be causing black smoke (unburned fuel) if those two events coincide.
1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.