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.
1982 Saab 900 S, 2D Hatchback, Automatic TransFACTORY OEM SERVICE PROCEDURE
Exhaust Gas RECIRCULATION: Testing
- Warm engine to normal operating temperature. Connect tachometer to engine. Increase engine RPM. Check that EGR valve opens at 1900 RPM on Turbo models or 2600 RPM on Non-Turbo models.
- Return engine to idle. Disconnect EGR hose at thermal vacuum valve. Create a vacuum in the EGR valve using a vacuum pump or by sucking on the hose. Engine should run rough or stall. If not, replace valve.
- Disconnect hoses from EGR valve and throttle housing vacuum port(s). Blow through hoses. Air should not pass when engine is cold, but should pass with engine warm.
Factory Service Tools
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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.