- Moderator
- #1
The 2008 f-super duty vehicles equipped with the 6.4L diesel engine are equipped with an oxidation catalytic converter (oc) and diesel particulate filter (DPF). The function and operation of these parts may cause some customers to percieve an issue with their vehicle. ACTION- Review the operating characteristics with the customer. OPERATING CHARACTERISTICS- Diesel particulates in the exhaust are trapped by the dpf. Regeneration is the process by which exhaust temperatures are increased so the particulates are combusted.. The frequency and length of regeneration will fluctuate as both are determined by the drive cycle. For most drive conditions, regeneration frequency will vary from 100-600 miles (161-804 km) between occurence and last from 10-40 minutes. The first regeneration does not require 100 miles and may occur at any time. The length of regeneration is usually reduced if a constant speed above 30 mph is maintained.The following is a list of normal operation while the vehicle is in regeneration, and do not require repair. If you are not sure if the vehicle is in regeneration, IDS can be used to monitor the diesel particulate filter pid. ---Engine idle speed can be 1100 to 1200 rpm in park/neutral with foot off the brake.---High idle speed drops to within 50 rpms of normal idle when the brake pedal is touched, PRNDL is actuated, or clutch is actuated.---White smoke in cold ambients is normal and the amount will be increased during regeneration.---Powertrain power is limited to 325 horsepower.---Engine responsiveness may be slightly different than normal operation.---During initiation of regeneration, exhaust smell may be noticed-especially on new vehicles.---Powertrain sound will be different including air induction noise (including flutter on deceleration or engine shutdown), exhaust noise, and changes in engine radiated noise.---During regeneration, exhaust temperatures are elevated.---The following is also normal and may be observed by a technician using a diagnostic tool. It is not likely that a customer would be aware of these: The throttle body is only active during the regeneration process and during shutdown. Egr is not operating during regeneration.
