Engine - Hesitation or Stumble On Acceleration

9235ford02

Article No.
92-14-9

07/01/92


^ HESITATION - 3.0L - DURING LIGHT TO HEAVY TIP-IN ACCELERATION AFTER INITIAL COLD START FOR THE FIRST MILE OF DRIVING AT AMBIENT TEMPERATURE OF 40 DEGREES F (4 DEGREES C) OR BELOW - VEHICLES WITH AUTOMATIC TRANSMISSION

^ STUMBLE - 3.0L - DURING LIGHT TO HEAVY TIP-IN ACCELERATION AFTER INITIAL COLD START FOR THE FIRST MILE OF DRIVING AT AMBIENT TEMPERATURE OF 40 DEGREES F (4 DEGREES C) OR BELOW - VEHICLES WITH AUTOMATIC TRANSMISSION


LIGHT TRUCK:
1992 RANGER


CALIBRATION:
2-56F-R00

WARNING:
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE. PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.

ISSUE:
A hesitation or stumble may occur on acceleration during the first mile of driving after initial cold start. This condition is most noticeable at ambient temperatures of 40~ F (4~ C) or below. This condition may be caused by the EEC-IV processor strategy.

ACTION:
Install a new EEC-IV processor with revised fuel delivery strategy.


1. Perform the diagnostic procedures in the 1992 Powertrain Control/Emissions Diagnosis Service Manual. Service as required.

2. If the hesitation/stumble still exists, install a new EEC-IV processor with a revised fuel delivery strategy (F29Z-12A650-AB).





Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.


PART NUMBER PART NAME CLASS

F29Z-12A650-AB EEC-IV Processor C

OTHER APPLICABLE ARTICLES:
NONE
WARRANTY STATUS:
Eligible Under Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
921409A Perform 1.9 Hrs.
Diagnostics/Replace
EEC-IV Processor/Install
Modification Decal
DEALER CODING
BASIC PART NO. CONDITION CODE
DRIVE 08
OASIS CODES:
611000, 611500