Engine - Stalls On Transmission Gear Engagement

9220ford02

Article No.
92-9-13

04/22/92


^ MISS - 4.9L - RANDOM MISFIRE - VEHICLES WITH AUTOMATIC OR MANUAL TRANSMISSION

^ STALL - 4.9L - DURING TRANSMISSION GEAR ENGAGEMENT - E40D ONLY

^ LATE GEAR SHIFTS AND ENGINE MISS


LIGHT TRUCK:
1991-92 BRONCO, ECONOLINE, F-150-350 SERIES


CALIBRATION:
2-52R-R00, 2-52J-R00, 2-52S-R00, 2-52H-R00, 2-52Q-R00, 2-52K-R00, 2-51F-R00, 2-51G-R00, 2-51H-R00, 2-51E-R00, 2-51R-R00, 2-52L-R00, 1-72J-R10, 1-71J-R10, 2-72M-R00, 1-52R-R00, 1-52J-R00, 1-52S-R00, 1-52H-R00, 1-52Q-R00, 1-52K-R00, 1-51F-R00, 1-51G-R00, 1-51H-R00, 1-51E-R00, 1-51R-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 random engine misfire. an engine stall during transmission gear engagement (E40D only) and late gear shifts may occur. An engine miss may occur on a heavy accel when tipping out of the throttle.

^ The delayed gear engagement and late shifts may be due to the interaction between the engine calibration and the transmission.

^ The engine misfire, stall and/or engine miss could be characteristic of the EEC IV Processor strategy.

ACTION:
Perform the EEC IV Self Test and, if necessary, install a new EEC IV Processor with improved strategy. Refer to the following procedure for service details.


1. Confirm the customer concern.

2. Perform the EEC IV Self Test. Correct service code(s) as necessary. Refer to the 1992 Powertrain Control/Emissions Diagnosis Service Manual for diagnostic procedures associated with the service codes.








3. If after correcting the service code(s), the condition still persists, replace the EEC IV Processor. Refer to the Application Chart for correct parts usage.





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.


The 1992 alternate module will supplement the 1991 and 1992 processor. (*) The 2-51G processor will be used to service the 1-51F and 2-51F calibrations.


OTHER APPLICABLE ARTICLES:
NONE
WARRANTY STATUS:
Eligible Under Basic Warranty Coverage For 1991 Models, Bumper To Bumper For 1992 Models, Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
920913A Test Drive, Perform EEC IV 1.1 Hr.
Self Test, Replace EEC IV
Processor
DEALER CODING
BASIC PART NO. CONDITION CODE
12A650 08
OASIS CODES:
503000, 505000, 607000, 609000, 609500, 610700