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 MANUALSPLYMOUTH1984HORIZON L4-97 1.6L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMIXTURE CONTROL SOLENOIDTESTING AND INSPECTION
1984 Plymouth Horizon L4-97 1.6L SOHC
Mixture Control Solenoid: Testing and Inspection
1984 Plymouth Horizon L4-97 1.6L SOHCSECTION Testing and Inspection
1. Connect a tachometer to engine and increase engine speed to 2000 RPM on front wheel drive models or 1500 RPM on rear wheel drive models.
2. Disconnect regulator solenoid connector from solenoid. On front wheel drive models without A/C, disconnect green wire only. Do not disconnect the idle solenoid. This can also be done by disconnecting the connector at the module.
3. Average engine speed should increase about 50 RPM.
4. Reconnect regulator solenoid connector. Engine should slowly return to speed set in step 1.
5. Disconnect six pin electrical connector on front wheel drive models, or 12 pin electrical connector from fuel control computer. Using a jumper wire, connect pin 15 at harness connector to ground. Engine speed should decrease a minimum of 50 RPM. If not, check for air leaks, or carburetor.
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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.