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 EXTENDED, 6.9 1REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISFUEL INJECTION SYSTEM - 6.9L DIESELADJUSTMENTSFAST IDLE SPEED
1987 Ford Econoline E350, Van Display Extended, 6.9 1
Fast Idle Speed
1987 Ford Econoline E350, Van Display Extended, 6.9 1SECTION Fast Idle Speed
- Start and run engine until it reaches normal operating temperature. Disconnect wiring harness from fast idle solenoid. Apply battery voltage to solenoid to activate it. Rev engine momentarily to set solenoid plunger. Fast idle speed should be 875-900 RPM.
- Adjust fast idle speed if necessary by turning solenoid plunger. Rev engine and recheck fast idle speed. Readjust if necessary. Remove battery voltage from solenoid and reconnect harness. See Fig 1 .
RENDER: 1.0x
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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.