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.
1989 Plymouth Colt BaseFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor/Switch: TBI
- Insert joint "A" of TPS to joint "B" and temporarily tighten screws. See Fig 1. After installing injection mixer assembly to engine, adjust throttle position sensor. Clamp connector into bracket.
- Check for proper installation of TPS. Measure resistance value between terminals No. 1 and 2 or 2 and 3 (2 and 3 or 1 and 3 on Van/Wagon) while moving throttle lever from open to close. If resistance value changes proportionally as throttle lever is moved, TPS is okay.
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.