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 MANUALSSAAB1987900 BASE, 2D HATCHBACK, 2.0 J, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR SYSTEMTESTINGPROPORTIONAL EGR SYSTEM
1987 Saab 900 Base, 2D Hatchback, 2.0 J, Automatic
Proportional EGR System
1987 Saab 900 Base, 2D Hatchback, 2.0 J, AutomaticSECTION Proportional EGR System
- Operate engine to normal operating temperature. Disconnect port "A" hose from signal converter at throttle valve housing. See Figure . Disconnect and plug port "C" hose from signal converter at intake manifold.
- Install vacuum pump on hose disconnected from port "A". Operate vacuum pump and note idle speed. If system operation is correct, engine idle should drop.
- Reconnect hose to port "C". Operate vacuum pump on hose disconnected from port "A". Engine speed should not be affected with vacuum application. Check EGR valve or thermostatic valve if system fails to operate.
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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.