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.
Intake Manifold Change-Over (IMCO) Valve
1995 Audi 90 Base, 2.8 K, AutomaticSECTION Intake Manifold Change-Over (IMCO) Valve
- Increase engine speed to more than 4100 RPM. If IMCO valve vacuum motor is actuated, system is okay. If IMCO valve vacuum motor is not actuated, disconnect electrical connector from IMCO valve control solenoid. See ELECTRICAL COMPONENT LOCATIONS .
- Measure resistance across terminals of IMCO valve control solenoid. If resistance is not 25-35 ohms, replace IMCO valve control solenoid. If resistance is 25-35 ohms, apply battery voltage across terminals of IMCO valve control solenoid. Replace IMCO valve control solenoid if it does not operate. If IMCO valve control solenoid operates, check PCM and wiring.
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.