Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB19869000 STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMTURBOCHARGEROPERATIONBOOST PRESSURE REGULATORROAD TESTING
1986 Saab 9000 Standard
Road Testing
1986 Saab 9000 StandardSECTION Road Testing
- Run hose of pressure gauge (83 93 514) from passenger compartment to engine compartment. Position pressure checking gauge vertically. Connect hose of pressure gauge to connection of vacuum hoses placed beside expansion tank. Disconnect APC system by detaching electrical wiring from solenoid valve.CAUTION: Checking maximum boost pressure in a road test must be performed as quickly as possible (approximately 3-5 seconds) to avoid abnormally high temperatures building up in brake linings.
- On cars with manual transmissions, start test by driving car in 3rd gear at an engine speed lower than 1500 RPM. On cars with automatic transmissions, start test by driving car with gear selector in position "1" at an engine speed lower than 1500 RPM.
- Depress accelerator pedal to floor. When engine speed approaches 3000 RPM, apply brakes with accelerator pedal pressed to floor. Read boost pressure from gauge with engine held under full load at 3000 RPM.NOTE: A boost pressure surge may be noted when engine is accelerated to maximum, i.e. boost pressure will momentarily exceed preset maximum figure when accelerator is floored.
- Once stabilized, pressure reading should be .3 Bar. Basic pressure setting is only initial setting for function of APC system and has no direct effect on maximum boost pressure level. Engine output is not increased by raising basic boost pressure above .3 Bar.
- If basic pressure setting falls outside tolerance, adjust boost pressure regulator basic pressure. If basic pressure setting falls within specified tolerances regulator valve lever stud should be sealed with a tamper-proof seal. Reconnect wiring to solenoid valve. Remove pressure reading equipment.
- Car should be driven at least 1/2 of a mile between each test and after testing is completed in order to allow brake linings to cool.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.