Power Loss Under Heavy Pull - Detroit Diesel Series 60 EGR Technician Manual

DDEC IV TESTING

Power Loss Under Heavy Pull

With power loss under heavy pull and in extreme cold ambient conditions, the engine will operate
in Condensation Protection. During this mode of operation, the engine boost will be reduced
and there is no reduction of power. Operating in this mode is a normal operating condition
and will not affect engine life or performance.
NOTE:
Trucks operating with winter fronts will experience this condition less often. DDC's
recommendations have not changed regarding winter front usage.
Perform the following steps for Power Loss Under Heavy Pull.
1. Check for diagnostic trouble codes. If Fault Codes are logged, diagnose the logged codes
first.
2. Visually inspect the air filter restrictions. If the air filter is clogged or dirty, replace the
air filter.
3. Visually inspect the air inlet hoses for soft or collapsed areas. If the air inlet hoses are
damaged, replace as necessary.
4. Visually inspect the air inlet for restrictions. If the air inlet has restrictions, clean as
necessary.
5. Visually inspect the entire length of the breather tube for kinks. If the breather tube has
kinks, repair as necessary.
6. Measure the fuel pressure under heavy loads.
[a] If the fuel pressure was spiking or decreasing, perform step 7.
[b] If the fuel pressure was not spiking or decreasing, testing is complete.
7. Remove the fuel pump.
[a] If the fuel pump is damaged, replace the fuel pump.
[b] If the fuel pump is not damaged, perform step 8.
8. Remove the fuel injectors and inspect for combustion passing the seat.
[a] If seats are damaged, replace as necessary.
NOTE:
The fuel injector may need to be replaced also.
[b] If the seats are not damaged, testing is complete.
5-4
All information subject to change without notice. (Rev. June 2005)
7SE60 0506 Copyright © 2005 DETROIT DIESEL CORPORATION