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 MANUALSMITSUBISHI1989SIGMA AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMTESTS W/O CODESTROUBLE SHOOTING (TBI)HESITATES OR MISSES - TBI
1989 Mitsubishi Sigma Automatic
Hesitates Or Misses - TBI
1989 Mitsubishi Sigma AutomaticSECTION Hesitates Or Misses - TBI
- Ensure vacuum hoses are not disconnected or damaged.
- Ensure electrical harness, connectors and wires are not broken or loose.
- Ensure there are no codes in memory.
- Check that fuel pressure meets specification.
- Check injector operation.
- Check airflow sensor voltage output.
- Check barometric pressure sensor voltage output.
- Check engine coolant temperature sensor operation.
- Check engine speed sensor operation.
- Check intake air temperature sensor operation.
- Check throttle position sensor operation. Adjust or replace if necessary.
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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.