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 MANUALSFORD1988AEROSTAR VAN PASSENGER, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDECELERATION CONTROL SYSTEMADJUSTMENT
1988 Ford Aerostar Van Passenger, Standard
Deceleration Control System: Adjustment
1988 Ford Aerostar Van Passenger, StandardSECTION 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 (A/T) vehicles, this will be set to 150 RPM higher than specified curb idle speed, 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. 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 (A/T) vehicles, reset idle to specifications with transmission in Drive. 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.