1990 VOLVO 240 air filter

Volvo 1990 240 Model
l Avoid using automatic transmission kick-down feature unless necessary.

Other factors which decrease gas mileage are:
l Worn or dirty spark plugs
l Incorrect spark plug gap
l Dirty air filter
l Incorrect valve clearance
l Incorrect idle speed
l Dirty engine oil and clogged oil filter
l Dragging brakes
l Incorrect front end alignment
l Low tire pressure

Shift indicator light

(manual transmission models only)

The Volvo shift indicator light (S.I.L.) is a device designed to help \
you get even better gas mileage from
your Volvo car. Studies have shown that the best fuel economy is obtaine\
d by shifting gears at low
engine rpm and high relative engine load. The Volvo S.I.L. is calibrated\
to show you when to shift for
improved mileage without sacrificing smooth acceleration .

Use of the S.I.L. is simple. Shift to next higher gear as soon as the li\
ght comes on. You may find after
using the S.I.L. for some time that your natural shifting rhythm will ad\
apt to the S.I.L.'s suggestion.
Some drivers may even shift before the light comes on.
Obviously, there will be times when you need to shift later than the lig\
ht would indicate (for example,
when climbing hills or trailer towing). Using the light regularly, howe\
ver, should result in a mileage
improvement of six percent or more, depending on how you normally drive.\


Programming instructions for shift indicator

If the current supply to the control unit is cut (battery disconnected)\
, the control unit will have to be re-
programmed as the control unit memory will be erased.
Drive the car in each gear (first gear not necessary) for approximatel\
y 8 seconds.
The gear change indicator light will flicker once (0.5 seconds), as ea\
ch gear is programmed.
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Volvo 1990 240 Model
EMISSIONS
SYSTEM
MAINTENANCE
Engine oil and oil
filter R
R R R R R R R R R R R R
Cooling system
hoses and
connections I
Engine drive belts A I I
Torque manifold
nuts A
Valve clearance I I
Timing belt A R (3)
Vacuum fittings,
hoses and
connections I
Air cleaner filter R R
Idle RPM I
Fuel system cap,
tank, lines and
connections I
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Volvo 1990 240 Model
pg. 65 Servicing
Engine Fuel System


The fuel injection system is all-electronic and is microprocessor contro\
lled. It can continually
compensate for variations in engine load, speed and temperature to give \
the best economy and power.
The most unique feature of the system is the air mass meter which measur\
es the mass of the inducted air
instead of the volume. In this way the system can make instantaneous adj\
ustments for changes in air
temperature or density, thus always assuring the best economy with the l\
owest possible exhaust
emissions. pg. 66 Servicing
Special Instructions for work on the fuel injection system

Extreme cleanliness is essential when working on the injection system. G\
reat care must be observed.
Injection system service should be handled by qualified technicians, usi\
ng equipment intended for this
service.

Fuel (line) filter

We recommend that this filter be changed every 60,000 miles (96,000 km)\
. The filter is replaced as one
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Volvo 1990 240 Model
complete unit.
Replace more frequently if contaminated fuel was introduced into the tan\
k.

Fuel system cap, tank, lines and connections

The ability of the fuel system to control hydrocarbon emissions is depen\
dent largely on a leak-free
system. Check for proper sealing of gasoline filler cap which contains "\
O"-ring type seals. Check all
evaporative hoses in vehicle for tightness. Check fuel lines under vehic\
le. Repair if necessary.

Air cleaner

Replace the air cleaner cartridge every 30,000 miles (48,000 km). The \
cartridge should be replaced more
often when driving under dirty and/or dusty conditions.
The filter cannot be cleaned and should always be replaced with a new on\
e.

Checking and adjusting idle speed

Your Volvo is equipped with an electronically controlled idle speed syst\
em that requires no period
checking or adjustment.

Lamda-sond (oxygen sensor) system

This is an emission control system designed to reduce emissions and impr\
ove fuel economy. An oxygen
sensor monitors the composition of the exhaust gases leaving the engine.\
The exhaust gas analysis is fed
into an electronic unit which continuously influences the amount of fuel\
injected. This adjusts the air-
fuel ratio to provide optimum conditions for combustion and efficient re\
duction of the three major
pollutants (hydrocarbons, carbon monoxide and nitrogen oxides) through\
a 3-way catalytic converter. pg. 67 Servicing
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Volvo 1990 240 Model
Spark plugs, high tension leads or distributor
cap worn (defective) Clean distributor cap and leads, check the cap for
cracks. Replace defective or worn parts.
Worn spark plugs. Remove. Clean or replace spark plugs.
Condition: Engine stalls at irregular intervals
Possible cause Correction
Defective wires. Check wire terminals at: fuel pump, fuse No. 5 and 7, coil, distributor,\
ignition
switch and relays.
Intake system
leaking. Check vacuum hose connections at manifold and auxiliary air valve.
Fuel filter clogged. Clean fuel tank filter and replace line fuel filter.
pg. 95 Service diagnosis
Condition: Excessive fuel consumption
Possible cause Correction
Fuel lines
leaking. Check
tightness.
Spark plugs
worn. Replace plugs.
Condition: Misfiring at highway driving speed

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