CADILLAC SEVILLE 1994 4.G Owners Manual

Downloaded from www.Manualslib.com manuals search engine SPECIFICATIONS
4.6 Liter 32 Valve (DOHC) Northstar Engine
The engine is a 4.6 liter (279 cu.in.) 90' V-8 featuring Dual Overhead
Cam
(DOHC), 32 valves, and-tuned sequential port fuel injection. This
design results in a powerful, refined engine which is well suited to even
the most demanding driving conditions.
Engine weight is minimized by the use
of low mass alloy materials. The
crankcase, cylinder heads and oil pan are made from cast aluminum. The
induction system housing, cam covers and oil filter adapter are cast
magnesium.
The reduced engine mass enhances vehicle handling,
responsiveness and fuel economy.
318

Downloaded from www.Manualslib.com manuals search engine The Northstar engine is designed to minimize the need for routine
maintenance while incorporating systems to remind the driver when
service is required.
An oil life index indicator monitors ongoing operating
conditions and reminds the driver when an oil change is needed.
A low
coolant warning message keeps track of the level of this vital fluid. Direct
acting hydraulic tappets provide maintenance free zero lash operation of
the
32 valves from idle to the 6500 rpm redline. The camshafts are driven
by a
two stage roller chain assembly which is designed to provide quiet
maintenance free operation. Platinum tipped spark plugs increase the
replacement interval to
100,OO miles.
The four valves per cylinder design provides more efficient engine
breathing, resulting in higher power than comparable
two valve engines.
The induction system uses smooth thermoplastic tubes
to channel air into
the cylinders. These smooth tubes simulate the elaborate port polishing
methods used on racing engines. The shape and length
of the tubes
boosts horsepower by using sonic pressure waves created by the motion of
the inlet valves to increase the amount
of air entering each cylinder. Once
the intake charge has entered the cylinder, the centrally located spark
plug ensures fast and efficient burning of the fuel/air mixture.
This engine is designed to be very durable. The aluminum block has
cast-in-place iron cylinder liners for greater wear resistance. High
strength connecting rods support the
free floating piston pins in bronze
bushings for superior high speed performance.
The fillets of the nodular
iron crankshaft undergo a high pressure compression rolling operation to
improve their resistance to fatigue.
Quiet operation is enhanced by the use
of special materials and designs.
The front cover of the engine is stamped from laminated steel which
damps out noise. Special cam cover gasket seals isolate va1v.e train
operation. The fuel injectors are placed inside the induction system
housing to eliminate the clicking noise which
is common to other fuel
injected engines.
The Northstar engine is designed to provide years
of efficient, reliable,
satisfying operation.
319

Downloaded from www.Manualslib.com manuals search engine 4T80E Transaxle
The Hydra-Matic 4T80E transaxle has been designed to complement the
output characteristics of the Northstar engine. The innovative design
incorporates several features which enhance its overall operation.
This transaxle is the first
of a new generation of “SMART” transmissions.
The computer which controls the electronic shift solenoids adapts to
changing environments while you drive. This provides consistent high
quality shifts under all conditions. Communication between the engine
and transaxle through this computer controls engine output during
activation
of torque management or traction control. Smooth shifting is
ensured by design. Hydraulic accumulators control shift pressures and all
shifts are made to free wheeling elements.
The 4T80E uses a
dry sump lubrication system with a scavenger pump.
This unique feature er,ables the transaxle to maintain adequate
pressurized oil supply during all maneuvers.
320
l-
l-

Downloaded from www.Manualslib.com manuals search engine Spirited performance with very efficient cruising operation are provided
by the combination
of 4 speed overdrive gearing, a torque converter
clutch, with a
3.71:l final drive ratio on the STS and a viscous converter
clutch with a
3.11:l final drive ratio on the Seville SLS.
Front Suspension
Your fully independent front suspension is a combination strut and spring
design. The frame is isolated from the body with
six rubber mounts.
Rubber bushings are used at the lower control arm pivots. The upper end
of the strut is isolated by a rubber mount which contains a bearing to
allow for wheel turning. The Road Sensing Suspension automatically
controls the damping rate of the struts.
The lower end of the steering knuckle pivots on a ball joint riveted to the
control arm. The ball joint
is connected to the steering knuckle with a
castellated nut and cotter pin.
321

Downloaded from www.Manualslib.com manuals search engine ShortlLongArm Suspension (SLA)
Your vehicle uses an independent shortflong arm rear suspension. All the
rear suspension components are mounted on a suspension support which
is attached to the body at four points and is fully isolated with bushings
and insulators to minimize road noise. Each rear wheel is connected to
the suspension support through the suspension knuckle using
an upper
and lower control arm and toe link.
The control arms and toe
link are attached to the suspension support on
the inboard side, and to a suspension knuckle on the outboard side. The
hub and bearing assembly is mounted to the knuckle and is a single,
non-serviceable unit which eliminates the need for wheel bearing
adjustment. The load leveling
(ELC) shock absorbers are attached to the
lower control arm, with the upper end
of the shock attached to the
suspension support. The springs are held in position between the lower
control arms and a pocket
in the suspension support.
322

Downloaded from www.Manualslib.com manuals search engine The suspension system also incorporates a new damping system know as
Road Sensing Suspension. This system control the damping forces in the
shock absorbers and struts, in response to various road and driving conditions.
The systems are capable
of making these damping changes extremely fast.
A computer receives inputs from vertical acceleration sensors, whee\
l to body
position sensors, vehicle speed sensor, lift and dive signals. This computer
evaluates the inputs from these sensors, to control the damping of each
of the
struts and shocks independently to provide varied levels
of suspension control.
The system also has the capability of providing Speed Sensitive Steering
control. This system changes your steering effort based on your vehicle speed.
Speed Sensitive Steering
This system varies the amount of steering effort proportionate to your vehicle
speed. Steering is easier at a lower speed for increased maneuverability and
parking
ease. As your vehicle speed increases, the steering effort is also
increased to provide a manual like steering feel for maximum control and
enhanced vehicle stability.
The power rack and pinion steering system has a rotary spool valve\
which
directs hydraulic fluid coming from the power steering pump to one side or
the other side
of the rack piston. The integral rack piston is attached to the
323

Downloaded from www.Manualslib.com manuals search engine rack. The rack piston converts hydraulic pressure to a linear force which
moves the rack left or right. The force is then transmitted through the
inner and outer tie rods to the steering knuckles, which turn the wheels.
If hydraulic assist is not available, manual control is maintained. However
under these conditions more steering effort is required.
4.6 LITER NORTHSTAR ENGINE
Displacement ............................... .4.6L (279 cu.in.)
No. of Cylinders .............................. 8 - 90 Degree V
Power (ACC. to
SAE 51349) ............... 270 (bhp) @ 5600 rpm
Torque (ACC. to
SAE 51349) ............ 300 (lbs. ft.) @ 4000 rpm
SLS
...................................... 204 (kW) @ 5600 rpm
...................................... 407(N*m) @ 4000 rpm
STS
Power (ACC. to SAE 51349) .1. ............ 295 (bhp) @ 6000 rpm
Torque (ACC. to
SAE 51349) ............ 290 (lbs. ft.) @ 4400 rpm
...................................... 220 (kW) @ 6000 rpm
...................................... 393 (Nom) @ 4400 rpm
Bore
........................................ 93mm (3.66 in.)
Stroke
...................................... .84mm (3.31in.)
Compression Ratio
................................... 10.3:l
Cylinder Heads
............................... Cast Aluminum
Cylinder Block
...... Die Cast
Aluminum with Iron Cylinder Bores
Intake Manifold
............ Die Cast Magnesium / Thermoplastic
........................................ Air Induction Tubes
Valve System
................... Direct Acting Hydraulic Tappets
Intake Valve
................................. 33mm (1.29 in.)
Exhaust Valve
................................ 29mm (1.14 in.)
Firing Order
.................................. 1-2-7-3-4-5-6-8
Pistons
...................................... Cast Aluminum
Left Bank
.......................................... 2-4-6-8
324

Downloaded from www.Manualslib.com manuals search engine Right Bank ......................................... 1-3-5-7
Camshaft
................... Induction Hardened Cast Grey Iron
Drive Type
........ Single Row / Staged Drive 8 mm Roller Chain
Main Bearings
......................................... Five
ENGINE LUBRICATION SYSTEM
Type of Intake ..................................... Stationary
Filter System
...................................... Full-Flow
ENGINE COOLING SYSTEM
Surge Tank Cap Relief Pressure ............... 15.0 psi (103 kPa)
Water Pump
Type ................................. Centrifugal
Drive Belt
....................................... Serpentine
Radiator Core
................................... Aluminum
Radiator Cooling Fans (2)
............................ Electric
Thermostat Starts
To Open
................ 192-199°F (89-93 "C)
FUEL SYSTEM
Induction Type ............ Sequential Port Fuel Injection (SPFI)
System Pressure .................... .33.4-43.5 psi (230-300 kPa)
Idle Speed
.................................. ECM Controlled
Filter Type
............................... Paper Type Element
Fuel Pump
................................. Electric (In Tank)
Fuel Required
................. Premium Unleaded (91 Octane)
AUTOMTIC TRANSAXZE
SLS (Trade Name ) ....................... Hydra- Matic 4TSOE
Type
..................................... 4-Speed Automatic
.................................... Viscous Converter Clutch
STS (Trade Name
) ....................... Hydra- Matic 4T80E
Type ..................................... 4-Speed Automatic
.................................... Torque Converter Clutch
325

Downloaded from www.Manualslib.com manuals search engine Fluid Required .............. DEXRON IIE' or DEXRON 111'
Axle Ratio (SLS) ..................................... 3.11:l
Axle Ratio (STS) ..................................... 3.71:l
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation .................... Controlled Flow
Catalytic Converter
......................... Ceramic Monolith
Evaporative Emission Control
................ Charcoal Canister
Crankcase Emission Control
....................... PCV Valve
Electronic System
..................... Open and Closed Loop
EXHAUST SYSTEM
Type ............................... Single with Crossover Pipe
Muffler
.................................. One-Reverse Flow
Resonator
............................................ None
Exhaust Pipe
.................................. Stainless Steel
Intermediate Pipe
............................. Stainless Steel
Tail Pipe
..................................... Stainless Steel
ELECTRICAL SYSTEM
Voltage ................................................. 12
Ground
........................................... Negative
Generator
......................................... 144 Amp
MR CONDITIONING SYSTEM
Refrigerant-R134a ......................... .2.375 lbs. (1.08 kg)
Not all air conditioning refrigerants are the same.
If the air condi-
tioning system in your vehicle needs refrigerant,
be sure.the proper
refrigerant is used.
If you're not sure, ask your Cadillac dealership.
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Downloaded from www.Manualslib.com manuals search engine FLUID CAPACITIES
Transaxle (4T80E) .............................. 30 pts. (14 L)
Engine Oil
................................... 7.0 qts. (6.6 L)
With Filter Change
............................ 7.5 qts. (7.2 L)
Engine Cooling System ....................... 12.5 qts. (11.8 L)
Fuel Tank .................................. 20 gallons (76 L)
Power Steering
.............................. 1.3 quarts (1.2 L)
Windshield Washer Reservoir
.................. 4.2 quarts (4.1 L)
TIGHTEN TORQUE
Spark Plugs ................................ 15 Nom
Oil Pan Drain Plug
.......................... 20N-m
VEHICLE DIMENSIONS
(11 lbs. ft.)
(15 Ibs. ft.)
SLS/STS
Shipping Weight (SLS)
Shipping Weight (STS)
Wheel Base
..........
Length ..............
Height ..............
Width ...............
.................... 3740 lbs. (1696.4 kg)
.................... 3802 lbs. (1724.3 kg)
...................... 111 in. (2819 mm)
.................... .204.1 in. (5183 mm)
..................... .54.5 in. (1384 mm)
..................... .74.2 in. (1884 mm)
Front Track
............................... .60.9 in. (1546 mm)
Rear Track
............................... .60.9 in. (1546 mm)