Chart 10

WARNING: This page is about a different car, the 2004 Ford Pickup Heritage. However, it is still accessible from the selected car via links, so may be relevant.

Lack/Loss of Power

NOTE: Verify the symptom reported is under normal driving conditions without excessive engine/vehicle load. Also, be aware of the engine rpm/speed limiting functions of the PCM.

SYSTEM/COMPONENT	REFERENCE (PINPOINT TEST - BI-FUEL CNG unless noted)
Intake Air System	Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
Secondary Ignition	Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
Fuel Delivery System	GO to Pinpoint Test HC .
Exhaust System	Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
EGR System	Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
Base Engine	Refer to appropriate ENGINE article.
Drivetrain	Refer to the appropriate AUTOMATIC TRANSMISSION article.
Brakes	Refer to the appropriate DISC & DRUM and/or BRAKE SYSTEM articles.
Automatic Transmission Fluid Throttle Linkage Air cleaner element	Visual.
Check the following PCM PIDs: DPFEGR (if equipped) (hot idle value within 0.15V of KOEO value) LONGFT1 / LONGFT2 (value between -20 and +20)	DPFEGR PID value not within 0.15V of KOEO value: Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE . LONGFT1 / LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. LONGFT1 / LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean.
Mass Air Flow (MAF) Sensor	Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
Additional Checks: Customer driving habits Correct PCM vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM . Charging System Engine speed limiting functions of the PCM (look for incorrect high vehicle speed signal)	Refer to the appropriate service information article.