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 MANUALSFORD1987CUTAWAY 6.9 1REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDECELERATION CONTROL SYSTEMADJUSTMENT
1987 Ford Cutaway 6.9 1
Deceleration Control System: Adjustment
1987 Ford Cutaway 6.9 1SECTION Adjustment
NOTE:
This adjustment is to be performed when replacing components found defective during "Testing" sequence.
- With engine at normal operating temperature, set transmission in Neutral (all transmissions).
- Adjust carburetor to specified curb idle speed. On Auto. Trans. vehicles, this will be set to 150 RPM higher than specified curb idle speed (which is set with transmission in "D"), although transmission will remain in neutral. This is to keep minimum load on engine.
- Disconnect system vacuum hose from throttle positioner diaphragm, and plug hose. Using "slave" hose, connect manifold vacuum source to diaphragm.
- Allow one minute for engine speed to stabilize. If engine speed is within specifications, modulator is properly set. Go to step 7).
- If RPM was not within specification, adjust throttle positioner by loosening lock nut and turning it until speed is within limits. Retighten lock nut.
- Detach manifold vacuum hose from positioner diaphragm, and allow engine to return to idle condition. Repeat procedure from step 2) as required until proper function occurs.
- Disconnect manifold vacuum hose from positioner diaphragm and allow engine to return to normal idle. Remove plug from original hose and reconnect it to throttle positioner fitting.
- On Auto. Trans. vehicles, reset idle to specifications with transmission in "D". On all vehicles, stop engine. Install air cleaner assembly.
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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.