Engine Vacuum Check - Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual

6) Disengage clutch (to lighten starting load on engine) for M/T
model, and depress accelerator pedal all the way to make
throttle valve full-open.
7) Crank engine with fully charged battery, and read the highest
pressure on compression gauge.
NOTE:
For measuring compression pressure, crank engine at
least 250 r/min. by using fully charged battery.
Compression pressure
Standard
Limit
Max. difference between any
two cylinders
8) Carry out Steps 5) through 7) on each cylinder to obtain four
readings.
9) After checking, install spark plugs and ignition coil assem-
blies and connect injector wire harness connector securely.

Engine Vacuum Check

The engine vacuum that develops in the intake line is a good indi-
cator of the condition of the engine. The vacuum checking proce-
dure is as follows :
1) Warm up engine to normal operating temperature.
NOTE:
After warming up engine, place transmission gear shift
lever in "Neutral" (shift selector lever to "P" range for A/T
model), and set parking brake and block drive wheels.
ENGINE MECHANICAL (G16 ENGINE) 6A1-5
Compression pressure
1400 kPa
2
(14.0 kg/cm , 199.0 psi)
1200 kPa
2
(12.0 kg/cm , 170.0 psi)
100 kPa
2
(1.0 kg/cm , 14.2 psi)