Ford Cobra 4.6L (4V) Manual

303-01C-1

DESCRIPTION AND OPERATION

Engine

WARNING: Do not operate the engine
with the hood open until the fan blade has been
first examined for possible cracks and separation.
The 4.6L (4V) (281 CID) Cobra engine is a V-8
with the following features:
• intercooled supercharger
• dual overhead camshafts
• four valves per cylinder
• sequential multiport fuel injection (SFI)
• an aluminum intake manifold
• aluminum cylinder heads
• a cast aluminum, 90-degree V- cylinder block
• individually chain-driven camshafts with a
hydraulic timing chain tensioner on each timing
chain
• the electronic ignition system with eight ignition
coils

Identification

Always refer to these labels when replacement parts
are necessary or when checking engine calibrations.
The engine parts often differ within a CID family.
Verification of the identification codes will ensure
that the correct parts are obtained. These codes
contain all the pertinent information relating to the
dates, optional equipment and revisions. The Ford
Master Parts Catalog contains a complete listing of
the codes and their application.
Code Information
The engine code information label, located on the
side of the valve cover and the front side of the
valve cover, contains the following:
• engine build date
• engine plant code
• engine code
Exhaust Emission Control System
Operation and necessary maintenance of the exhaust
emission control devices used on this engine is
covered in the Powertrain Control/Emissions
Diagnosis (PC/ED) manual.
Copyright 2002, Ford Motor Company
Last updated: 6/14/2002
Engine — Cobra 4.6L (4V)

Induction System

The sequential multiport fuel injection (SFI)
provides the fuel/air mixture needed for combustion
in the cylinders. The eight solenoid-operated fuel
injectors:
• are mounted in the lower intake manifold.
• meter fuel into the air intake stream in accordance
with engine demand.
• are positioned so that their tips direct fuel just
ahead of the engine intake valves.
• are connected in series with the fuel pressure
sensor.
• supply fuel from the fuel tank with a fuel pump
mounted in the fuel tank.
A constant fuel pressure drop is maintained across
the fuel injectors by the fuel pressure sensor. The
fuel pressure sensor:
• is positioned upstream from the fuel injectors on
the fuel injection supply manifold.
Valve Train
The valve train operates as follows:
• ball-tip hydraulic lash adjusters provide automatic
lash adjustment.
• roller followers ride on the camshaft lobes,
transferring the up-and-down motion of the
camshafts to the valves in the cylinder heads.
Positive Crankcase Ventilation System
All engines are equipped with a closed-type positive
crankcase ventilation system recycling the crankcase
vapors to the upper intake manifold.
Lubrication System
The engine lubrication system operates as follows:
• oil is drawn into the oil pump through the oil
pump screen cover and tube in the sump of the
oil pan.
• oil is pumped through the oil bypass filter on the
left front side of the cylinder block.
• oil enters the main oil gallery where it is
distributed to the crankshaft main journals and to
both cylinder heads.
303-01C-1
2003 Mustang, 8/2002