Turbocharger Boost Pressure; Waste Gate; Air Bypass Valve; Intercooler - Mazda 626 MX-6 Workshop Manual

4B
TURBOCHARGING SYSTEM
4B-52

TURBOCHARGER BOOST PRESSURE

1. Be sure the engine is cool.
2. Disconnect hose A from the solenoid valve and
connect the SST as shown.
3. Warm up the engine to normal operating tem­
perature.
4. Increase the engine speed to 4,000 rpm and
check that the boost pressure is within specification.
Specification:
• Above 0 kPa (0 kg/cm2, 0 psi)
(any positive pressure)
86U04B-043

WASTE GATE

1. Be sure the engine is cool.
2. Remove the exhaust manifold insulator and side
insulator.
3. Remove the hose (connected to actuator) and con­
nect the SST as shown.
4. Apply 58.9 kPa (0.6 kg/cm2, 8.5 psi) of com­
pressed air.
5. Check that the rod moves when disconnecting and
reconnecting the hose supplying the compressed
air.
Caution
Do not apply compressed air over 98 kPa (1.0
kg/cm2, 14 psi).

AIR BYPASS VALVE

1. Remove the air bypass valve.
2. Connect a vacuum pump to port A of the valve.
3. Apply vacuum and blow from port B.
4. Check that air flows at the specified vacuum.
5. If not correct, replace the air bypass valve.
Vacuum:
250—400 mmHg (9.8—15.7 inHg)
86U04B-045

INTERCOOLER

1. Remove the intercooler.
2. Inspect it for cracks, restriction, or damage.
3. Replace if necessary.
86U04B-046