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EM–8
If the compression of one or more cylinders is low, pour a
small amount of engine oil into that cylinder through the
spark plug hole and measure the cylinder compression
again.
•
If adding oil helps the compression to improve,
chances are that the piston rings and/or cylinder bores
are worm or damaged.
•
If the pressure remains low after the operation has
been performed, the valves may be sticking or seated
un properly, or there may be leakage post the gasket.
9. Checking of CO/HC concentrations
Preparation to be made prior to check of CO/HC concentrations.
•
Apply the parking brake fully.
•
Check and adjust the ignition timing.
•
Check and adjust the idle speed.
•
Warm up the engine thoroughly.
•
All accessory switches are turned OFF.
•
The air cleaner element is installed.
•
All pipes and vacuum hose are connected.
•
Ensure that the intake system exhibits no air leakage.
•
Ensure that the exhaust system exhibits no gas leakage.
•
On the automatic transmission vehicle, the shift lever is placed in the [N] or [P] range.
•
On the manual transmission vehicle, the shift lever is placed in the neutral position.
•
Position the steering wheel to the straight-ahead direction.
•
Be sure to prepare the CO/HC meter by following the instruction of its manufacturer, before it is
put into use.
NOTE:
•
This check is used only to determine whether or not the idle HC/CO emission complies with the regu-
lations.
Measure the HC/CO emission by inserting a sampling pipe of the HC/CO meter into the exhaust pipe.
Wait at least one minute before the measurement so as to allow the concentrations to stabilize.
Complete the measurement within three minutes.
If the HC/CO concentrations do not conform to the regulations, see the following table for possible
causes.
JEM00023-00016
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