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 Maintenance |
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In-depth APPS resetting
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For those needing or unfamiliar with the process...
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APPS Reset Procedure
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This procedure has shown to help 24 valve ISB engines. It is basically
teaching the fly by wire accelerator on these trucks to reread the
position of the pedal and it's limits. Most complaints this will help
with is poor acceleration, improper shifting, bucking in 5 and 6
speeds. Has been known to increase fuel mileage in some instances.
- Set parking brake
- Disconnect negative battery cables on both batteries
- Turn ignition key to run(to drain any remaining capacitors)
- Let truck sit for 30 minutes( this is the recommended minimum)
- Return ignition to OFF position
- Reconnect both batteries and secure, not a timed event
- Turn key to run position(not start) and depress accelerator
- Allow pedal to return to top position slowly
- Turn ignition switch OFF
- Release parking brake
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Intake Air Temp IAT
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Applys to all 98.5 and up Cummins.The intake air temp sensor is located
on the drivers side of the motor just above the lift pump and rearward
of the fuel filter on the intake manifold. The IAT sensor reads the
manifold air temp and sends a signal to the ECM to regulate intake ait
grid heaters,fuel timing,fuel control, As fuel to air temps vary the
sensors resistence changes the signal to the ECM. It has been my
experience that if an exhaust brake is used that the IAT can become
fouled with soot and the sensor becomes inaccurate, I personally clean
mine every 10k miles with carburator cleanor, this make the allmighty
Cummins happy and idles better as well as better overall performance
including MPG.
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Manifold Air Temp (MAP)
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The map sensor found on all 98.5 and up Cummins equipted trucks is very
important as your fuel delivery rate is partially determined by the
MAP.The MAP sensor is located on the drivers side of the motor just
above the lift pump and rearward of the fuel filter side of the intake
manifold,Its just below the IAT sensor. The MAP sensor reads the
manifold air pressure and sends a signal to the ECM to regulate fuel
timing,fuel control, As air pressures vary the sensors resistence
changes the signal to the ECM. It has been my experience that if an
exhaust brake is used that the MAP can become fouled with soot and the
sensor becomes inaccurate, I personally clean mine every 10k miles with
carburator cleanor, The torque spec on the sensor is 10 ft. lbs.this
makes the allmighty Cummins happy and idles better as well as better
overall performance including MPG.
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Advanced Servicing of the BHAF
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My BHAF was getting kinda grundgy on the outside so I thought I would give it a cleaning.
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