1998 HONDA PRELUDE fuel

Malfunction Indicator Lamp

This indicator comes on for a few seconds when yon turn the ignition
switch ON (II). If it comes on at any
other time, it indicates one of the
engine's emissions control systems
may have a problem. Even though
you may feel no difference in your
vehicle's performance, it can reduce
your fuel economy and cause your
vehicle to put out excessive emissions. Continued operation may
cause serious damage. If you have recently refueled your
vehicle, the cause of this indicator coming on could be a loose or
missing fuel fill cap. Check the cap
and tighten it until it clicks. Replace
the fuel fill cap if it is missing.
Tightening the cap will not make the indicator turn off immediately; it
takes three driving trips.
If the indicator remains on past threedriving trips, or the fuel cap was not
loose or missing, have the vehicle
checked by the dealer as soon as
possible. Drive moderately until the dealer has inspected the problem.
Avoid full-throttle acceleration and driving at high speed.
You should also have the dealer inspect your vehicle if this indicator
comes on repeatedly, even though it
may turn off as you continue driving.If you keep driving with the
malfunction indicator lamp on, you can
damage your vehicle's emissionscontrols and engine. Those repairs may
not be covered by your vehicle 's warranties.
Taking Care of the Unexpected
MALFUNCTION INDICATOR LAMP


NOTICE
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Technical Information

The diagrams in this section give you the dimensions and capacities of
your Honda, and the locations of the identification numbers. The expla-
nations of several electronic and mechanical systems on your Honda
are for the more technically-oriented
owner. Identification Numbers................. 252
Specifications................................. 254
Tire Information............................ 256 Tire Size Designation................ 256
Wheel Size Designation............ 256
Tire Speed Ratings.................... 256 Tire Pressure Adjustment For High Speed Driving........ 257
DOT Tire Quality Grading....... 257 Treadwear.............................. 257
Traction.................................. 258
Temperature.......................... 258 Oxygenated Fuels.......................... 259
Driving in Foreign Countries....... 260
Emissions Controls........................ 261
The Clean Air Act...................... 261Crankcase Emissions Control System..................................... 261
Evaporative Emissions Control System..................................... 261
Exhaust Emissions Controls.... 262 PGM-FI System..................... 262
Ignition Timing ControlSystem................................. 262
Exhaust Gas Recirculation (EGR) System.................... 262
Three Way Catalytic
Converter............................ 262

Replacement Parts..................... 262
Three Way Catalytic Converter... 263

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Oxygenated Fuels

Some conventional gasolines are
being blended with alcohol or an
ether compound. These gasolines

are collectively referred to as

oxygenated fuels. To meet clean air

standards, some areas of the United

States and Canada use oxygenated

fuels to help reduce emissions.

If you use an oxygenated fuel, be
sure it is unleaded and meets the

minimum octane rating requirement.

Before using an oxygenated fuel, try

to confirm the fuel's contents. Some
states/provinces require this
information to be posted on the

pump.
The following are the EPA-approved
percentages of oxygenates:
ETHANOL (ethyl or grain alcohol)
You may use gasoline containing up to 10 percent ethanol by volume.Gasoline containing ethanol may be
marketed under the name "Gasohol."
MTBE (Methyl Tertiary Butyl Ether)
You may use gasoline containing up to 15 percent MTBE by volume.
METHANOL (methyl or wood
alcohol)

You may use gasoline containing up to 5 percent methanol by volume as
long as it also contains cosolvents and corrosion inhibitors to protect
the fuel system. Gasoline containing more than 5 percent methanol by
volume may cause starting and/or performance problems. It may alsodamage metal, rubber and plastic
parts of your fuel system. If you notice any undesirable
operating symptoms, try another
service station or switch to another
brand of gasoline.
Fuel system damage or performance
problems resulting from the use ofan oxygenated fuel containing more
than the percentages of oxygenates
given above are not covered under

warranty.

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Driving in Foreign Countries

If you are planning to take your
Honda outside the U.S. or Canada,
contact the tourist bureaus in theareas you will be traveling in to find
out about the availability of unleaded
gasoline with the proper octane

rating.

If unleaded gasoline is not available,
be aware that using leaded gasoline in your Honda will affect perfor-
mance and fuel mileage, and damage
its emissions controls. It will no
longer comply with U.S. andCanadian emissions regulations, and
will be illegal to operate in North
America. To bring your vehicle back into compliance will require the re-
placement of several components, such as the oxygen sensors and the
three way catalytic converter. These replacements are not covered under
warranty.

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Emissions Controls

The burning of gasoline in your vehicle's engine produces several by-products. Some of these are carbon
monoxide (CO), oxides of nitrogen (NOx) and hydrocarbons (HC).
Gasoline evaporating from the tank
also produces hydrocarbons. Con-
trolling the production of NOx, CO, and HC is important to the environ-
ment. Under certain conditions of sunlight and climate, NOx and HC
react to form photochemical "smog." Carbon monoxide does not contri-
bute to smog creation, but it is a
poisonous gas. The Clean Air Act
The United States Clean Air Act* sets standards for automobile
emissions. It also requires that
automobile manufacturers explain to
owners how their emissions controls
work and what to do to maintain them. This section summarizes how
the emissions controls work.Scheduled maintenance is on page 164.
* In Canada, Honda vehicles comply
with the Canadian Motor Vehicle Safety Standards (CMVSS) forEmissions valid at the time they are
manufactured. Crankcase Emissions Control
System
Your vehicle has a Positive Crankcase Ventilation System. This
keeps gasses that build up in the engine's crankcase from going into
the atmosphere. The Positive Crank- case Ventilation valve routes them
from the crankcase back to the intake manifold. They are thendrawn into the engine and burned.
Evaporative Emissions Control
System
As gasoline evaporates in the fuel tank, an evaporative emissions
control canister filled with charcoaladsorbs the vapor. It is stored in this
canister while the engine is off. After
the engine is started and warmed up,
the vapor is drawn into the engine and burned during driving.

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Emissions Controls

Exhaust Emissions Controls
The exhaust emissions controls include four systems: PGM-FI,
Ignition Timing Control, ExhaustGas Recirculation and Three Way
Catalytic Converter. These four
systems work together to control the
engine's combustion and minimize
the amount of HC, CO, and NOx that comes out the tailpipe. The exhaust
emissions control systems are
separate from the crankcase and
evaporative emissions control
systems.

PGM-FI System

The PGM-FI System uses sequential multiport fuel injection.
It has three subsystems: Air Intake,
Engine Control, and Fuel Control.
The Engine Control Module (ECM) uses various sensors to determine
how much air is going into the engine. It then controls how much
fuel to inject under all operating conditions. Ignition Timing Control System
This system constantly adjusts the ignition timing, reducing the amount
of HC, CO and NOx produced.
Exhaust Gas Recirculation (EGR)
System

The Exhaust Gas Recirculation (EGR) system takes some of the
exhaust gas and routes it back into
the intake manifold. Adding exhaust
gas to the air/fuel mixture reduces the amount of NOx produced when
the fuel is burned.
Three Way Catalytic Converter
The three way catalytic converter is in the exhaust system. Through
chemical reactions, it converts HC,CO, and NOx in the engine's exhaust
to carbon dioxide (C02), dinitrogen
(
N2), and water vapor.

Replacement Parts

The emissions control systems are designed and certified to work to-
gether in reducing emissions to
levels that comply with the Clean Air
Act. To make sure the emissions remain low, you should use only newGenuine Honda replacement parts or
their equivalent for repairs. Using
lower quality parts may increase the emissions from your vehicle.
The emissions control systems are covered by warranties separate from
the rest of your vehicle. Read your
warranty manual for more informa-
tion.

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Index

Cleaning
Aluminum Wheels..................... 221Carpeting.................................... 222
Exterior....................................... 220
Fabric.......................................... 222
Interior........................................ 222
Seat Belts....................................223
Vinyl............................................ 222
Windows..................................... 223
Clock, Setting the ............................ 85
Clutch Fluid.................................... 186
Coin Box........................................... 88
CO in the Exhaust......................... 261
Cold Weather, Starting in............. 133
Compact Spare............................... 228
Consumer Information*................ 266
Controls, Instruments and.............. 49
Coolant
Adding......................................... 177
Checking..................................... 124

Proper Solution.......................... 177

Replacing.................................... 179

Temperature Gauge.................... 57
Corrosion Protection..................... 224

Courtesy Lights............................... 90
Crankcase Emission Control

System......................................... 261

Cruise Control Operation............... 65

Customer Relations Office........... 266

DANGER, Explanation of................. ii
Dashboard........................................ 50
Daytime Running Lights................. 60
Dead Battery, What to Do............ 236
Defects, Reporting Safety............. 270
Defog and Defrost........................... 98
Defogger, Rear Window................. 63
DEXRON ®
III Automatic
Transmission Fluid.................... 183
Dimensions..................................... 254
Dimming the Headlights ................ 60
Dipstick Automatic Transmission........... 183
Engine Oil................................... 123
Directional Signals........................... 61
Disabled, Towing Your Car If...... 250
Disc Brake Wear Indicators......... 145
Disposal of Used Oil...................... 176 Doors
Locking and Unlocking............... 72
Power Door Locks....................... 72
DOT Tire Quality Grading........... 257
Downshifting, 5-speed Manual Transmission.............................. 134
Drive Belts...................................... 190
Driving............................................ 131
Economy..................................... 125
In Bad Weather.......................... 150
In Foreign Countries................. 260
Economy, Fuel............................... 125
Emergencies on the Road............. 227 Battery, Jump Starting.............. 236
Brake System Indicator............ 243Changing a Flat Tire................. 229
Charging System Indicator ...... 241
Checking the Fuses................... 245
Low Oil Pressure Indicator...... 240
Malfunction Indicator Lamp.... 242
Manually Closing Moonroof.... 243
Overheated Engine................... 238 CONTINUEDProCarManuals.comMain Menu s t

Index

Emergency Brake............................ 84
Emergency Flashers....................... 63
Emission Controls......................... 261

Engine

Coolant Temperature Gauge ..... 57
Malfunction Indicator Lamp................................. 53, 242
Oil Pressure Indicator......... 53, 240
Oil, What Kind to Use............... 173
Overheating................................ 238
Specifications............................. 254
Ethanol in Gasoline ....................... 259
Evaporative Emission Controls.... 261
Exhaust Fumes................................ 47
Expectant Mothers, Use of Seat Belts by.........................................17
Exterior, Cleaning the................... 220
Fabric, Cleaning............................. 222

Fan, Interior...................................... 92

Features, Comfort and Convenience................................. 91
Filling the Fuel Tank..................... 121 Filters

Air................................................187

Oil................................................175

First Gear, Shifting........................ 142 5-speed Manual Transmission Checking Fluid Level................ 184
Shifting the................................. 134
Flashers, Hazard Warning.............. 63
Flat Tire, Changing a.................... 229
Fluids Automatic Transmission........... 183
Brake...........................................185
Clutch..........................................186

Manual Transmission............... 184
Power Steering........................... 186

Windshield Washer................... 182

FM Stereo Radio
Reception.................................... 105

Folding Rear Seat............................ 79

Foreign Countries, Driving in...... 260 Four-way Flashers........................... 63

Front End, Towing by
Emergency Wrecker................. 250

Fuel..................................................120

Fill Door and Cap....................... 121
Gauge............................................ 57
Octane Requirement................. 120

Oxygenated................................ 259

Reserve Indicator......................... 55
Tank, Filling the......................... 121

Fuses, Checking the...................... 245

Gas Mileage, Improving................ 125
Gasohol........................................... 259
Gasoline.......................................... 120 Fuel Reserve Indicator................ 55
Gauge............................................ 57Octane Requirement................. 120
Tank, Filling the......................... 121
Gas Station Procedures................. 121

Gauges
Engine Coolant Temperature .... 57

Fuel................................................57

Gearshift Lever Positions Automatic Transmission........... 137

5-speed Manual
Transmission.......................... 134
Glass Cleaning............................... 223
Glove Box......................................... 74ProCarManuals.comMain Menu s t