Diesel Tech Questions: Duramax Losing Power, 6.0L Ford Engine Ramping Up, and P0299 Codes Photo Gallery
Top Tech: You've Got Questions? We've Got Answers!
Bruce W. Smith –
Sep 1, 2016
Photo 1/3 | Turbochargers | Later-model Duramax engines are very finicky when it comes to making turbocharger upgrades, requiring custom tuning even when a stock turbo is swapped with a ’charger of a slightly higher performance level. If a custom tune isn’t used, a P0299 diagnostic-trouble code and the ECM activating “limp-home” mode are the likely outcomes under heavy loads.
Photo 2/3 | Wear Spot On Engine | A “wear spot” on the accelerator-pedal-position-sensor rheostat is one common issue that affects 24-valve Cummins engines that run primarily at constant highway speed for long periods of time as they wear.
Photo 3/3 | Engine Data Logging | A diesel engine’s sudden rpm ramp up and return to normal is often a sign of an accelerant being induced into the fuel stream. Tracking down the exact source, however, would be impossible without data-logging engine activity.