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Home >> Plymouth >> 1986 >> Horizon Base, 1.6 A >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Carburetor CEC Tests W/Codes >> Testing >> Electronic Spark Control System Tests >> Spark Control Computer Spark Test

Spark Control Computer Spark Test

  1. Warm engine to normal operating temperature. Set basic timing. Disconnect carburetor switch or unground it. Ensure coolant temperature sensor is connected and working properly.
  2. Remove and plug vacuum hose at vacuum transducer. Connect a vacuum pump to the vacuum transducer and apply 16 in. Hg vacuum. Increase engine speed to 2000 RPM and wait one minute before checking specifications. Advance specifications include 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.
  3. If computer fails to obtain settings, replace computer.
SPARK ADVANCE TEST SPECIFICATIONS (1)

Application Computer Part No. (2) ° Advance
1.6L 5226411 33
2.2L (Exc. Shelby)
Federal & High Altitude
M/T 5226439 40
A/T 5226433 40
California
M/T 5226455 40
A/T 5226451 36
2.2L (Shelby)
Federal 5226449 38
California 5226645 36
(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 emission label, use label as accurate listing.
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