Diesel Tech Questions: weird shifting, steering wobble and more. Photo Gallery
Top Tech: You've Got Questions? We've Got Answers!
Bruce W. Smith –
Jan 6, 2017
Photo 1/5 | Weak Turbo Top Tech
Photo 2/5 | 001 Mystery Steering Wobble Top Tech | Super Duty 4x4 front axles turn even when the hubs are unlocked. If a bound-up or rusted U-joint gets in the right position while cornering, it’ll cause the axleshaft to bind, which results in a violent shaking of the steering wheel.
Photo 3/5 | 002 Egr Cooler Resistor Top Tech | Sometimes, aftermarket EGR coolers on 6.7L Cummins engines will throw a P2457 diagnostic trouble code, indicating the cooler isn’t doing its job. In actuality it is—just not to the exact degree the OEM computer likes. One trick to overcome the code-throwing is to solder a ¼-watt 10 K ohm resistor (brown, black, orange, gold bands) to the brown and white wire that comes out of the EGR orifice temperature sensor.
Photo 4/5 | 003 Coolant Hose Rub Top Tech | Check the heater core return line on your ’04-to-’07 Super Duty to make sure the heater core hose/tube that crosses the firewall isn’t ready to pop a leak. It has a tendency to rub on the FICM. Rotating the hose/pipe slightly will provide clearance and stop the potential coolant leak.
Photo 5/5 | 004 Weak Turbo Top Tech | Knowing if a turbo is functioning properly isn’t easy to tell unless you can monitor the boost—and know what pressure is normal and what isn’t for that application.