Sometimes the additives are only a bandaid for stiction. Hopefully its done sticking though.
Looking at purchasing a 6.7 with 400,000kms , cel on and code P0266 , plus thumping noise coming from the exhaust!I've uploaded a video and hope it works. This is at idle with no one touching the pedal. Just starts and stops on its own. I'm waiting on my CTS to arrive for codes. Just wondered if anyone has seen this. I can hear there is an injector down but I've never heard the popping noise.
you have a valve train issue. Either from a failed rocker arm, flat cam/bad lifter.Looking at purchasing a 6.7 with 400,000kms , cel on and code P0266 , plus thumping noise coming from the exhaust!
Front of the engine has no thumping noise , truck still starts great , idles and drives perfectly , any ideas of what the issue might be? I have attached a audio file f the noise& a link to the youtube video , thanks in advance.6.7 thumping noise out exhaust