TROUBiESHOOTlNG
IGNITION SYSTEM
The cause of hard engine starting is not always in the
ignition system. Defective parts may exist in the fuel
system, exhaust emission control system, starting
system or the engine itself.
The role of the ignition system is to generate suffi-
cient electric sparks at the proper time. To check the
ignition system, therefore, ,it is. necessaiy that the
spark check and timing measurement are carefully
For on-vehicle troubleshooting of the ignition system,
the short cut is to determine on the basis of symptoms
which is defective: the power supply, primary low-
tension circuit or high-tension circuit. For example,
when all spar& plugs fail to produce sparks, the pro-
bable cause is in power. supply or primary circuit.. If
misfiring occurs only at a specific spark plug, the high
tension circuit is likely to be defective.. If misfiring
performed. _
occurs ‘octiasionally, loose leads or spark plugs may be
_.
suspected.
Check
starting system
‘S-25
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