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.
1987 Plymouth Horizon AutomaticFACTORY OEM SERVICE PROCEDURE
2.2L & 2.5L Engines (Except Turbo)
NOTE:
To ensure proper operation of the EGR system all passages and moving parts must be free from plugging or sticking as a result of deposits. Clean or replace components and hoses as necessary.
- With engine at operating temperature, allow the engine to run an additional 70 seconds. Attach a tachometer to the engine. Accelerate the engine abruptly to approximately 2000 RPM, but not over 3000 RPM.
- During this procedure check the EGR valve stem for movement. Visible movement of the valve stem should occur. Repeat test to confirm operation. Movement of the stem indicates that the control system is functioning correctly. If faulty operation is indicated, see TROUBLE SHOOTING .
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.
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