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 MANUALSFORD1987ECONOLINE E350, VAN DISPLAY, 4.9 YREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UPIGNITION SYSTEM - DURA-SPARK IITESTINGSPARK TIMINGCENTRIFUGAL ADVANCE MECHANISM TEST
1987 Ford Econoline E350, Van Display, 4.9 Y
Centrifugal Advance Mechanism Test
1987 Ford Econoline E350, Van Display, 4.9 YSECTION Centrifugal Advance Mechanism Test
- Disconnect vacuum advance hose and increase engine speed to 2500 RPM. Check ignition timing with vacuum advance hose disconnected and then allow engine to return to idle. If ignition timing advanced, go to next step. If timing did not advance, replace distributor. After service, repeat this step.
- Check initial (base) timing at specified RPM. If ignition timing is within F2 degrees of specification, distributor centrifugal advance mechanism is okay. Go to next test. If initial (base) timing is incorrect, replace distributor.
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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.