Engine Exhaust; Running The Vehicle While; Parked; Diesel Particulate Filter - Cadillac XT4 Owner's Manual

Engine Exhaust

Warning
Engine exhaust contains carbon
monoxide (CO), which cannot be
seen or smelled. Exposure to CO
can cause unconsciousness and
even death.
Exhaust may enter the vehicle if:
The vehicle idles in areas with
poor ventilation (parking garages,
tunnels, deep snow that may
block underbody airflow or
exhaust pipes).
The exhaust smells or sounds
strange or different.
The exhaust system leaks due to
corrosion or damage.
The vehicle exhaust system has
been modified, damaged,
or improperly repaired.
There are holes or openings in
the vehicle body from damage or
aftermarket modifications that
are not completely sealed.
Warning (Continued)
If unusual fumes are detected or if
it is suspected that exhaust is
coming into the vehicle:
Drive it only with the windows
completely down.
Have the vehicle repaired
immediately.
Never park the vehicle with the
engine running in an enclosed area
such as a garage or a building that
has no fresh air ventilation.

Running the Vehicle While

Parked

It is better not to park with the engine
running.
If the vehicle is left with the engine
running, follow the proper steps to be
sure the vehicle will not move. See
Shifting Into Park 0 209 and
Engine Exhaust 0 211.
DRIVING AND OPERATING

Diesel Particulate Filter

The exhaust system has a Diesel
Particulate Filter (DPF) to reduce
vehicle emissions. On some exhaust
systems with a DPF, the exhaust
cooler mixes air with the exhaust to
lower the temperature before it leaves
the tailpipe.
The DPF, the tailpipe, and other
exhaust system components must not
be altered. Regularly inspect and clean
any mud or dirt from the exhaust
cooler, especially where the exhaust
cooler connects to the tailpipe and the
openings where fresh air enters the
cooler.
The DPF will clean itself as part of
normal operation. Several factors,
including fuel consumed, hours of
engine operation, and miles driven,
are monitored by the Engine Control
Module (ECM). The self-cleaning
occurs approximately once per tank
of fuel.
Vehicles with the DPF have specific
fuel and engine oil requirements. See
Fuel for Diesel Engines 0 264 and
Engine Oil 0 291.
211