Turbine Doc
Just Another Diesel Guy
Stock exhaust ???, mine did that when I had Banks exhaust, with it's cross flow muffler, had it and lived with it for years, never understood what was going on but mostly happened with hard acceleration, replaced with a Heath exhaust and it stopped, Heath exhaust is straight thru flow muffler, I don't understand why the high boost on the S truck and just stock programming.
(this truck new to you?) does it have a boost fooler on it or a 3 BAR map sensor which is lying to the PCM what the actual boost is, have you checked boost with a scan tool to see what boost the PCM is actually seeing, bad MAP sensor going low could account for extra boost and just stock programming.
Has this boost drift been there since the gauge install or is this something recent.
(this truck new to you?) does it have a boost fooler on it or a 3 BAR map sensor which is lying to the PCM what the actual boost is, have you checked boost with a scan tool to see what boost the PCM is actually seeing, bad MAP sensor going low could account for extra boost and just stock programming.
Has this boost drift been there since the gauge install or is this something recent.