GxT Ferret 54 ENGINE DIAGNOSTIC CENTER - Manual (Page 63)

5-2
DISTRIBUTOR ENGINES, Continued
Note: Use repair manuals and compare similar engines to obtain actual specifications.
Typical readings shown apply to most normal vehicles.
IGNITION
SECONDAR
Y
ST
ARTING / CHARGING
HIST
OR
Y
POWER
BAL
& CONT
.
FUEL
INJ
SENSORS
Measurement Typical Readings Interpretation
Firing KV 8 to 15 KV Checks plug gaps and wire condition.
Burn Time, Live 0.8 to 2.3 mSec Checks condition of secondary ignition
(Engine at Idle) system. Finds open or grounded spark
plug wires.
Burn Time, Minimum More than 0.8 mSec Shows worn or wide gap plugs, breaks
(Accelerate Engine) in spark plug wires, or lean fuel, if less.
Burn Time, Maximum Uniform among cylinders Finds fouled or grounded plugs or wires.
(Accelerate Engine) Locates ignition misfires. Rich fuel mix.
Cranking Volts Not less than 9.6 volts. Checks battery and starter condition,
performance.
Cranking Amps 100 to 300 Amps High amps, possible bad starter.
Low amps, possible bad connections,
or bad battery.
Cranking RPM Over 150 RPM Checks starter performance.
Alternator Amps 50 to 100 Amps Compare alternator output to specs.
Battery CCA est. 500 to 1000 CCA If lower than the rating on the battery,
Compare to Battery the battery is weak and may be ready
Specs. for replacement.
Amps Peak Less than 5 percent Probably low compression, if more
than 8%.
Power Difference All cylinders should be If one or more cylinders are high, compare
per Cylinder less than 5. to the Electronic Compression and
Secondary tests.
%RPM drop when 5 to 15% uniform The higher the number the stronger
each cylinder is the cylinder. A negative number means
shut off the speed increased.
Port Injection 0.4 to 20 mSec Measures on-time of the injector drive.
Solenoid Duty 30
°
to 60
°
M/C, 10 Hertz Checks function of mixture control solenoid.
Throttle Position 0.5 to 5V with no glitches Checks function of throttle position sensor.
Sensor
Oxygen Sensor 0.45V & over 1 Checks activity of the oxygen sensor.
Cross./Sec.