1983 Plymouth Horizon 2.2 C, StandardFACTORY OEM SERVICE PROCEDURE

Spark Control Computer Spark Test

  1. Warm engine to normal operating temperature. Disconnect carburetor switch or unground it. Be sure coolant temperature switch/sensor is connected and working properly.
  2. Remove and plug vacuum hose at vacuum transducer. Connect an auxiliary vacuum supply to vacuum transducer and apply 16 in. Hg. Increase engine speed to 2000 RPM and wait 1 minute before checking specifications. Advance specifications are in addition to basic advance. See Spark Advance Test Specifications table.
    NOTE: On some systems with an accumulator (timer), the specified time must be reached with the carburetor switch ungrounded before checking for specified spark advance schedule.
  3. If computer fails to obtain settings, replace computer.
SPARK ADVANCE TEST SPECIFICATIONS (1)

Application Computer Part No. (2) Advance
1.6L 5213641 19-27°
1.7L 5213438 26-34°
2.2L
Rampage/Scamp
Fed. 5213691 24-32°
Calif.
Man. Trans. 5213834 24-32°
Auto. Trans. 5213832 24-32°
High Alt. 5213840 30-38°
All Others
Fed.
Man. Trans. 5213834 24-32°
Auto. Trans. 5213832 24-32°
Calif.
Man. Trans. 5213838 27-35°
Auto. Trans. 5213836 30-38°
High Alt. 5213840 30-38°
(1) Engine speed of 2000 RPM and 16 in. Hg vacuum applied.
(2) All readings plus or minus 4°. If amount of advance differs from control label, use label as accurate listing.
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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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