DD15 Coolant Pipe (from Coolant Collecting Pipe to Oil Coolant Module). Takeoff EGR Venturi Pipe w/ Sensor Call the following number for the part. Inspect the EGR pipes (Hot Pipe, Venturi and Delivery Pipe) for leaks. Are leaks present? Yes; repair and/or replace as necessary and verify repairs. No; Go to step 12. NOTE: Oil residue at the turbo compressor wheel is normal. Excessive oil can be caused by excessive idle time, high air inlet restriction, or high crankcase pressure. Exhaust Pipe 19. Water Manifold 20. Support Bracket 21. Connector Hose 23. Coolant Crossover Pipe 25. Seal Ring Figure 1. DD15 and DD16 Exhaust Gas Recirculation Cooler and Related Parts 2 Description and Operation of the DD15 and DD16 Exhaust Gas Recirculation Cooler 4 All information subject to change without notice. This may be caused by plugged ports in the EGR Venturi Pipe. This slows down the response of the sensor but sometimes produces no codes because the unit is in Smoke Control, often for several seconds at a time. This will cause no throttle response or poor acceleration. CORRECTION: Clean the two Venturi ports and replace the Delta Pressure sensor. Ventury flow meter works on the principle of Ventury Effect. A reduction in fluid pressure occurs when a fluid flows through a constricted section of pipe. This happens mainly due to increased flow velocity because of reduced cross section. Reduction in pressure is related to actual fluid velocity as well as density of the fluid.
COMPLAINT:
Driver may experience poor acceleration and throttle response on DD engines. Code SPN 2659/FMI 1 EGR Flow Target Error Diagnostic/Low Flow may be logged, but at times no codes may be logged at all.
CAUSE:
This may be caused by plugged ports in the EGR Venturi Pipe. This slows down the response of the sensor but sometimes produces no codes because the unit is in Smoke Control, often for several seconds at a time. This will cause no throttle response or poor acceleration.
Venturi Smoking Pipe
CORRECTION:
Venturi Tobacco Pipe
Venturi Pipe Design
Clean the two Venturi ports and replace the Delta Pressure sensor.