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 MANUALSVOLVO1991940 TURBO, 4D SEDAN, AW71REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/O CODESSYMPTOM DIAGNOSISHESITATION - ACCELERATION
1991 Volvo 940 Turbo, 4D Sedan, AW71
Hesitation - Acceleration
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Hesitation - Acceleration
- Check fuel injectors.
- Check ignition and sensor wires for proper connection.
- Check distributor cap for moisture or carbon tracking.
- Ensure spark plug wires are okay.
- Ensure spark plugs are not fouled.
- Check MAP sensor (if applicable).
- Check throttle switch and connector.
- Check ignition and coil circuit.
- Check engine speed sensor or Hall Effect Sensor (turbo).
- Check idle valve and ensure airflow arrow points in correct direction.
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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.