Ignition Timing; Engine Idle Speed; Engine Compression; Foreword - Subaru SVX 1992 Manual

2-2 [01001 ON-CAR SERVICES
1 . Foreword
This chapter describes major inspection and service
procedures for the engine mounted on the body . For
procedures not found in this chapter, refer to the ser-
vice procedure section in the applicable chapter.
2 . Ignition Timing
5) Check idle speed when loaded . (Turn air conditioner
switch "ON" and operate compressor for at least one
minute before measurement.)
Idle speed (A/C switch "ON" and gears in N position)
800± 50 rpm
(A/C switch "ON" and gears in D position)
700± 50 rpm
A: INSPECTION
1) Warm up the engine (A/C switch "OFF") .
2) Connect "Select Monitor" and measure ignition tim-
ing . (Function mode "07")
If the timing is not correct, check the ignition control
system . (Refer to "2-7 Fuel Injection System".)
Ignition timing [BTDC/rpm] :
20°± 8°/610
3 . Engine Idle Speed
A: INSPECTION
1) Before checking idle speed, check the following :
(1) Ensure that air cleaner element is free from clog-
ging, ignition timing is correct, spark plugs are in
good condition, and that hoses are connected prop-
erly .
(2) Ensure that CHECK ENGINE light is off.
2) Warm up the engine .
3) Connect "Select Monitor" and measure engine rpm.
(Function model "04")
4) Check idle speed when unloaded (with headlights,
heater fan, rear defroster, radiator fan, air conditioner,
etc . OFF) .
If idle speed is outside specifications, refer to General
Troubleshooting chart under "2-7 Fuel
Injection
System".
4. Engine Compression
F-
A-.M
-
EASUREMENT
1) After warming up the engine, turn off the ignition
switch .
2) Make sure that the battery is fully charged.
3) Remove all the spark plugs.
(Refer to "6-1 Spark plug [W4A0]" .)
4) Disconnect connectors from fuel injector .
5) Fully open the throttle valve.
6) Check the starter motor for satisfactory performance
and operation .
7) Connect compression gauge to spark plug hole .
8) Crank the engine by means of the starter motor, and
read the maximum value on the gauge when the pointer
is steady .
9) Perform at least two measurements per cylinder,
and make sure that the values are correct.
Compression (200 - 300 rpm and fully open throttle) :
Standard
1,177 - 1,422 kPa
(12.0 - 14.5 kg/cm', 171 - 206 psi)
Limit
Idle speed (No load and gears in N or D position)
981 kPa (10 .0 kg/cm', 142 psi)
610± 100 rpm
Difference between cylinders
196 kPa (2 .0 kg/cm2, 28 psi)
r
i i Compression gauge
\X
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Fig. 1
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