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 MANUALSFORD1985ECONOLINE E350, VAN DISPLAY EXTENDED, 5.8 GREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSIS5.0L/5.8L FEEDBACK CARBURETOR TESTS W/CODESQUICK TESTSTEST T - SPARK TIMING CHECK
1985 Ford Econoline E350, Van Display Extended, 5.8 G
Test T - Spark Timing Check
1985 Ford Econoline E350, Van Display Extended, 5.8 GSECTION Test T - Spark Timing Check
- If spark advance was not 27-33° in Engine Running Self Test, place system in Self-Test. After last Self-Test service code is displayed, system returns to normal after 2 minutes and spark timing will no longer be locked at 30°.
- Connect timing light to engine. Locate spark output circuit to TFI module and open the connection. Start engine and check base timing. Base timing is 7-13° BTDC. If timing is correct, go to step 3 . If timing is not correct, reconnect spark output circuit and set base timing. After timing is adjusted, repeat Self Test.
- Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect. Connect breakout box. Turn ignition on. With DVOM on 20 volt scale, measure voltage from box pin 37 to pin 40 and from box pin 57 to pin 60. If either reading is less than 10.5 volts, perform TEST B - VEHICLE BATTERY . If both readings are 10.5 volts or more, go to step 4 .
- Turn ignition off and wait 10 seconds. Disconnect harness connector at TFI module. With DVOM on 200 ohm scale, measure spark output circuit from spark output pin (pin 2) on TFI harness connector to box pin 36. If 5 ohms or less, continue to next step. If more than 5 ohms, repair open circuit. Check timing as described in step 1 .
- Install breakout box, leave TFI harness disconnected. With ignition off, place DVOM on 200 ohm scale. Measure resistance from box pin 16 to TFI harness connector ignition ground pin (pin 6). If less than 5 ohms, go to TEST A - NO START , step 7). If 5 ohms or more, repair harness as required and repeat Self Test.
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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.