Chrysler Concorde 1993 Service Manual page 494

ACCELERATOR PEDAL AND THROTTLE CABLE . . 18
FUEL DELIVERY . . . . . . . . . . . . . . . . . . . . . . . . . 2
FUEL TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SEQUENTIAL MULTI-PORT FUEL INJECTION—
GENERAL DIAGNOSIS . . . . . . . . . . . . . . . . . . 35
SEQUENTIAL MULTI-PORT FUEL INJECTION—
GENERAL INFORMATION
Throughout this group, references may be made to
a particular vehicle by letter or number designation.
The Introduction Section at the front of this manual
explains the different designations.
This Group contains several different sections.
Each section has an Index of the systems and compo-
nents it addresses.
Group 25 describes the function of the Evaporation
Control and Exhaust Gas Recirculation systems. Re-
fer to Group 25, Emissions.
FUEL REQUIREMENTS
3.3L ENGINE
The vehicle is designed to meet all emission regu-
lations and provide excellent fuel economy when us-
ing high quality unleaded
minimum octane rating of 87.
3.5L ENGINE
The vehicle will operate satisfactorily on fuels
ranging from regular unleaded gasoline having a
minimum octane rating of 87 to premium unleaded
with a minimum rating of 91. However, midgrade
unleaded fuel with a minimum octane rating of 89 is
recommended. The use of premium unleaded gasoline
will further improve performance.
Light spark knock at low engine speeds is not
harmful to your engine. However, continued heavy
spark knock at high speeds can cause damage and
should be reported to your dealer immediately. En-
gine damage resulting from operating with a heavy
spark knock may not be covered by the new vehicle
warranty.
In addition to using unleaded gasoline with the
proper octane rating, gasolines that contain deter-
gents, corrosion and stability additives are recom-
mended. Using gasolines that have these additives
will help improve fuel economy, reduce emissions,
and maintain vehicle performance. Generally, pre-
mium unleaded gasolines contain more additive than
regular unleaded.
FUEL SYSTEMS
CONTENTS
page
gasoline having a
ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . 47
SEQUENTIAL MULTI-PORT FUEL INJECTION—
SERVICE PROCEDURES . . . . . . . . . . . . . . . . . 55
SEQUENTIAL MULTI-PORT FUEL INJECTION—
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . 20
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 72
Poor quality gasoline can cause problems such as
hard starting, stalling, and stumble. If you experi-
ence these problems, try another brand of gasoline
before considering service for the vehicle.
GASOLINE/OXYGENATE BLENDS
Some fuel suppliers blend gasoline with materials
that contain oxygen such as alcohol, MTBE and
ETBE. The type and amount of oxygenate used in
the blend is important.
The following are generally used in gasoline
blends:
Ethanol - (Ethyl or Grain Alcohol) properly
blended, is used as a mixture of 10 percent ethanol
and 90 percent gasoline. Gasoline blended with eth-
anol may be used in your vehicle.
Methanol - (Methyl or Wood Alcohol) is used in a
variety of concentrations when blended with un-
leaded gasoline. You may find fuels containing 3 per-
cent or more methanol along with other alcohols
called cosolvents.
Do not use gasolines containing Methanol.
Use of methanol/gasoline blends may result in
starting and driveability problems and damage to
critical fuel system components.
Problems that are the result of using methanol/gas-
oline blends are not the responsibility of Chrysler
Corporation and may not be covered by the new ve-
hicle warranty.
MTBE/ETBE - Gasoline and MTBE (Methyl Ter-
tiary Butyl Ether) blends are a mixture of unleaded
gasoline blended and up to 15 percent MTBE. Gaso-
line and ETBE (Ethyl Tertiary Butly Ether) are
blends of gasoline and up to 17 percent ETBE. Gas-
oline blended with MTBE or ETBE may be used in
your vehicle.
Clean Air Gasoline
Many gasolines are now being blended that con-
tribute to cleaner air, especially in those areas of the
country where pollution levels are high. These new
blends provide a cleaner burning fuel and some are
referred to as reformulated gasoline.
FUEL SYSTEMS 14 - 1
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