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.
1987 Volkswagen Vanagon Base, AWDFACTORY OEM SERVICE PROCEDURE
Full Throttle Enrichment Function
- Operate engine until engine oil temperature is at a minimum of 176°F (80°C). Stop engine and connect CO tester and tachometer. Start engine and allow to idle for 2 minutes.
- Remove connector from double sided connector at throttle valve switch. See Figure . Slowly accelerate engine to approximately 4500 RPM. Note and record CO level reading.
- Bridge connections of double sided connector using Adapter (VW 1490 ). Note CO reading. Reading should increase at least 1% over recorded CO reading.
- If reading did not increase, check for defective wiring, engine temperature sending unit or control unit.
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.