1987 Plymouth Horizon AutomaticFACTORY OEM SERVICE PROCEDURE

Throttle Control

The throttle control system is used to maintain or raise engine speed for certain conditions. The conditions when engine speed is raised are during A/C or, during timer operation. There are 2 timers used in this system. When the engine is started, one of the timers provides a 2 second delay, during which engine speed is raised. When the throttle is closed, another timer prevents the throttle from closing all the way immediately.

Factory Service Tools

Use the Manual With the Right Hardware

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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