Engine Break-In; Fast Idle System - freightliner WALK-IN VAN CHASSIS Operator's Manual

GM Gasoline Engine
•
Make sure the fuel cap is fully installed. The
diagnostic system can determine if the fuel cap
has been left off or is incorrectly installed. A
missing or loose fuel cap allows fuel to evapo-
rate into the atmosphere. A few driving trips
with the fuel cap properly installed should turn
the MIL lamp off.
•
If the vehicle has been driven through a deep
puddle of water, the system could be wet. In-
spect the electrical system and make sure it is
not wet. This condition is usually corrected
when the electrical system dries out. A few
driving trips should turn the MIL lamp off.
•
Make sure to fuel the vehicle with quality fuel.
Poor fuel quality causes the engine not to run
as efficiently as designed and can cause—
– stalling after start-up;
– stalling when the vehicle is changed into
gear;
–
misfiring;
– hesitation on acceleration; or
– stumbling on acceleration.
If one or more of these conditions occur, change the
fuel brand used. At least one full tank of the proper
fuel will be required to turn the MIL lamp off. See
Fuel in this chapter for information on the proper fuel
to use.
If the MIL lamp will not go off after performing the
above steps, your dealer can check the vehicle. The
dealer has the proper test equipment and diagnostic
tools to fix any mechanical or electrical problems that
may have developed. A GM dealership can also
check gasoline engines.

Engine Break-In

The engine will perform better over time if the guide-
lines below are followed.
•
Keep the vehicle speed at 55 mph (88km/h) or
less for the first 500 miles (805 km).
•
Do not drive at one constant speed, either fast
or slow, for the first 500 miles (805 km). Do not
make full-throttle starts. Avoid downshifting to
brake or slow the vehicle.
•
Avoid making hard stops for the first 200 miles
(322 km). During this time, the new brakes are
15.3
not yet broken in. Making hard stops with new
brakes can lead to premature wear and early
replacement. This guideline should be followed
each time new brakes are installed.
•
Do not tow a trailer during the break-in period.
Once the break-in period has been met, engine
speed and load can be gradually increased.

Fast Idle System

NOTE: If the vehicle has this feature, it is avail-
able for use only with cruise control. There are
three preset speeds (800, 900, or 1000 rpm)
available.
The fast idle system can be used to increase engine
idle speed whenever the following conditions are
met.
•
The brake pedal is not pressed.
•
The vehicle must not be moving and the
throttle must not be pressed.
Fast Idle Operation
1.
To enable the fast idle system, press and release
the cruise control ON/OFF switch.
2. For the preset fast idle, press and release the
cruise control set switch. This will set the preset
fast idle speed.
IMPORTANT: The fast idle system does not
have any type of light activation in the instru-
ment panel. The only light that will be illumi-
nated is the cruise indicator.
Any of the following actions will turn off the fast idle
system.
•
Applying the brake.
•
The transmission shifter is moved out of Park
(P) or Neutral (N); this will engage the trans-
mission.
•
Selecting the cruise control ON/OFF switch
when it was previously on.