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 MANUALSFORD1999WINDSTAR BASE, VAN CARGO, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TROUBLE SHOOTING - NO CODES - EEC-VSYMPTOMSLOW IDLE (STALLS ON DECELERATION)SYMPTOM CHECKS
1999 Ford Windstar Base, Van Cargo, 3.8 4
Symptom Checks
1999 Ford Windstar Base, Van Cargo, 3.8 4SECTION Symptom Checks
Check the following items:
- On A/T models, torque converter may not be functioning properly. See appropriate article in AUTOMATIC TRANSMISSIONS.
- If idle is low (with A/C on) on F250 (less than 8500 lbs. GVW), F350 (less than 8500 lbs. GVW), Econoline 5.4L and Econoline 6.8L, check ACCS Parameter Identification (PID) value. See PIN VOLTAGE/PID VALUE CHARTS article. With A/C clutch engaged, ACCS PID value should indicate ON. If PID value indicates OFF, go to TEST KM, step 10) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article.
- Check fuel delivery fuel system. See TEST HB (natural gas vehicles) or TEST HC (except natural gas vehicles) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article.
- Check air intake system. See TEST HU under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article.
- Check engine mechanical condition. Check compression, camshaft, valve train components, etc. If mechanical condition is okay, return to SYMPTOM DIAGNOSIS to identify any additional symptoms or go to TEST Z under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V article and check for intermittent faults.
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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.