Rough Or Rolling Idle, Stalls, Misses, Hesitation Or Surge

WARNING: This page is about a different car, the 2002 Ford Pickup and 2002 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Check vehicle for any driveability symptoms in gasoline mode. Repair any driveability symptoms in gasoline mode before diagnosing ALT fuel system. Go to SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE & NGV article.

NOTE: If engine stalls after start up and base gasoline engine system has sufficient fuel, diagnose for a no-start. Go to TEST AC: NO START - ALT FUEL SWITCH INDICATOR IS ON, THEN OFF under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - BI-FUEL article.

Check fuel delivery system. See TEST HC: FUEL DELIVERY SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - BI-FUEL article.
Check secondary ignition system. See TEST JB: SECONDARY IGNITION under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check exhaust system for restriction. See TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check PCV system. See TEST HG: PCV SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check automatic transmission operation. See FORD 4R70W DIAGNOSIS or FORD 4R100 DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
Check EVAP emission system for blockages (engine stalls) or leaks (excessive fuel odor). See SYSTEM TESTS (EVAPORATIVE EMISSION) in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check engine mechanical condition. Check compression, camshaft, valve train components, etc. Repair as necessary. See appropriate article in ENGINES.
Check air intake system. See TEST HU: AIR INTAKE SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.
Check Mass Air Flow (MAF) sensor and related circuits. See TEST DC: MASS AIRFLOW SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.

Additional Checks

Check for correct PCM Vehicle Identification (VID) block information. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE under PROGRAMMING PCM in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. Check drivelines. Check charging system. See GENERATORS & REGULATORS - BLACKWOOD, EXPEDITION, F150 & NAVIGATOR article in STARTING & CHARGING SYSTEMS. Check A/C system for surge with A/C on, and check A/C compressor diode, if equipped, for rolling idle. See AUTOMATIC AC-HEATER SYSTEMS - BLACKWOOD & F150 or MANUAL A/C-HEATER SYSTEMS - F150 article in AIR CONDITIONING & HEATING. Check speed control system for surge with speed control on. See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT. Ensure engine RPM/speed limiting functions of PCM are operating properly. Check for incorrect high vehicle speed signal. If no problems are indicated, return to SYMPTOM DIAGNOSIS to identify any additional symptoms or check for intermittent faults. See TEST Z: INTERMITTENT under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.