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Test HC: Fuel Delivery System: Testing

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.

  1. 1) Check System Integrity

    Perform SYSTEM INSPECTION  before proceeding. Make any repairs as necessary. If all checks are okay, go to next step.

  2. 2) Perform Road Test

    Road test vehicle at highway speeds with ALT fuel switch in ALT position. If no surge is present while driving, go to next step. If a surge is present while driving, fuel is contaminated. Release fuel pressure. See FUEL SYSTEM VENTING in REMOVAL, OVERHAUL & INSTALLATION - F150 PICKUP - BI-FUEL article. Replace fuel system filters. Road test vehicle. If surge is no longer present while driving, test is complete. If surge is still present while driving, perform COMPUVALVE CHECK  under QUICK TEST. If fault still exists, replace compuvalve.

  3. 3) Perform Cylinder Power Balance Test With ALT Fuel Switch In GAS Position

    Perform cylinder power balance test with ALT fuel switch in GAS position. If there is a noticeable power loss in one or more cylinders, go to LACK/LOSS OF POWER under SYMPTOMS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article. If there is no noticeable power loss from any one cylinder, go to next step.

  4. 4) Perform Cylinder Power Balance Test With ALT Fuel Switch In ALT Position

    Perform cylinder power balance test with ALT fuel switch in ALT position. If there is no noticeable power loss from any one cylinder, go to next step. If there is a noticeable power loss in one or more cylinders, clear blockage from indicated cylinder's injector sleeve.

  5. 5) Check AFCM MAP PID

    Ensure MAP sensor damper tube is installed properly and inserted flush against compuvalve body. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, access AFCM and select MAP PID from PID/DATA MONITOR & RECORD menu. With KOEO, monitor MAP PID and record value. Start engine and warm to normal operating temperature. Allow engine to idle at normal operating temperature (hot idle) and record new MAP PID value. MAP PID value should be 13.5-15.0 psi with KOEO, and 3-7 psi at hot idle. If MAP PID value is within specification, perform TEST DB: MAP/BARO SENSOR . If MAP PID value is not within specification, go to next step.

  6. 6) Check MAP Tap Assembly

    Ensure MAP sensor damper tube installed on vehicle is an original production part. Ensure damper tube is not plugged and that damper tubes are not crimped. If MAP tap assembly is okay, perform COMPUVALVE CHECK  under QUICK TEST. If fault still exists, replace compuvalve. If MAP tap assembly is not okay, replace MAP tap assembly with a calibrated service part as necessary.
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