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 MANUALSVOLKSWAGEN1991JETTA L4-1984CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSSPECIFICATIONS
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Emission Control Systems: Specifications
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Specifications
EGR VALVE
Vacuum To Open Valve 0.7 - 0.8 in. Hg
Thermostatic Air Cleaner (TAC)
Open To Warm Air 68° F (20 ° C)
Open To Cold Air 86° F (30 ° C)
Thermo-Vacuum Valve (EGR)
Valve Open Below 81° F (27° C)
Valve Closed Above 120° F (49° C)
Vacuum Amplifier (EGR)
VACUUM AT IDLE
With Tee In Red Vacuum Line 0.3 in. Hg.
AMPLIFIED VACUUM AT IDLE
With Tee In Blue Vacuum Line 1.5 - 3.5 in. Hg.
RENDER: 1.0x
NO RELATED
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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.