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

9) 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 (rpm) by using fully charged battery.
Compression pressure
Standard : 14.0 – 16.0 kg/cm
1600 kPa)
2
Limit : 13.0 kg/cm
Max. difference between any two cylinders : 1.0 kg/cm
(14.2 psi, 100 kPa)
10) Carry out Steps 7), 8) and 9) on each cylinder to obtain 6
readings.

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 and make
sure that engine idle speed is within specification.
2) Stop engine and disconnect vacuum hoses from fuel pres-
sure regulator valve (3) or intake collector (1) to EVAP canis-
ter purge valve (2).
3) Connect special tools (Vacuum gauge and hose joint) and
3way joint between vacuum hose and valve.
Special tool
(A) : 09915-67311
(B) : 09918-08210
SUZUKI GENUINE PARTS
(C) : Hose 09355-35754
(D) : 3way joint 09367-04002
4) Start engine and run engine at specified idle speed, and
read vacuum gauge. Vacuum should be within specification.
Vacuum specification (sea level)
450 – 600 mmHg (17.7 – 23.7 in.Hg) at specified idle speed
5) After checking, remove vacuum gauge and hose joint.
6) Connect vacuum hoses to fuel pressure regulator valve.
ENGINE MECHANICAL (H25 ENGINE) 6A2-5
2
(199.0 – 227.5 psi, 1400 –
(185.0 psi, 1300 kPa)
2