1992 Volvo 740 L4-2320cc 2.3L SOHC Turbo VIN 87 B230FT
Turbo Boost Pressure Test
CAUTION: Excessive boost pressure can damage your engine.
NOTE: First check all turbo related hoses and connections for good condition.
Replace if needed.
1. Connect pressure gauge Volvo tool #5230 (or equivalent) between line to boost pressure gauge and intake manifold connection.
2. Run gauge into passenger compartment.
3. Start engine and run until it reaches operating temperature.
4. Drive vehicle in 3rd gear (2nd for A/T) at approx 1500 RPM.
5. Press accelerator pedal to the floor (but do not engage kick-down).
6. Apply brakes at approx. 3000 RPM while still holding the accelerator pedal in the full load position. Do not apply brakes for more than five seconds. Read boost pressure on gauge.
Reading: 50 ±4 kPa (7.1 ±0.6 psi)
If boost pressure is correct, turbo system operates correctly. Disconnect all testing equipment and reinstall hose. If boost pressure is incorrect, adjust wastegate valve (refer to ADJUSTMENT PROCEDURES ) and retest.
7. If valve adjustment does not fix the problem, check the following: Download File PDF
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