Section 06
ENGINE MANAGEMENT (DI)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
06-03-36
SMR2002-075 _06-03A.FM
The “hot” type plug has a longer insulator nose
and transfers heat more slowly away from its firing
end. It runs hotter and burns off combustion de-
posits which might tend to foul the plug during
prolonged idle or low speed operation.
1. Cold
2. Hot
CAUTION:
Severe engine damage might occur
if a wrong heat range plug is used.
A too “hot” plug will result in overheating and pre-
ignition, etc.
A too “cold” plug will result in fouling or may cre-
ate carbon build up which can heat up red-hot and
cause pre-ignition or detonation.
Fouling
Fouling of the spark plug is indicated by irregular
running of the engine, decreased engine speed
due to misfiring, reduced performance, and in-
creased fuel consumption. This is due to a loss of
compression. Other possible causes are: pro-
longed idling, or running on a too rich mixture or
incorrect fuel. The plug face of a fouled spark plug
has either a dry coating of soot or an oily, glossy
coating given by an excess either of oil or of oil
with soot. Such coatings form a conductive con-
nection between the center electrode and ground.
Spark Plug Installation
Prior to installation make sure that contact surfac-
es of the cylinder head and spark plug are free of
grime.
1. Using a wire feeler gauge, set electrode gap ac-
cording to the following chart.
2. Apply anti-seize lubricant over the spark plug
threads to prevent possible seizure.
3. Hand screw spark plug into cylinder head. Then,
tighten the spark plug clockwise an additional
1/4 turn with a proper socket.
1. Proper socket
2. Improper socket
CRANKING SYSTEM
See above for start/stop switch and the DESS post
testing. Refer to STARTING SYSTEM section for
other tests.
DI SYSTEM TEST SUMMARY
Pressure Tests
A00E09A
1
2
ENGINE
SPARK
PLUG
TORQUE
GAP
mm (in)
DI
NGK
ZFR4F-11
Hand tighten
+ 1/4 turn with
a socket
1.1
(.043)
COMPONENT
VALUE
kPa (PSI)
Air compressor
621 ± 14 (90 ± 2) at cranking
Fuel pressure
regulator
185 ± 14 (27 ± 2)
when installing safety lanyard
Fuel pressure
738 ± 14 (107 ± 2)
inline test at cranking or
when engine is running
Fuel pump
721 (105) minimum at cranking
A00E0BA
2
1
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Summary of Contents for GTX 4-TEC 5573 2002
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