Hombre S Regular Cab 4WD V6-4.3L (1999)
Technical Service Bulletin # SB03-02-S002
Date: 030401
Campaign - Fuel Injector Warranty Extension
TSB SBO3-02-S002
Special Policy Adjustment SCPI Failures in California Only (YF5 Emission Equipped) (Supersedes SB00-02-5003)
Special Policy Adjustment, Sequential Central Port Fuel Injector (SCPI) Failures in California Only (YF5 Emission Equipped) (This Bulletin Supersedes
Bulletin SB00-02-S003)
ISSUE DATE: APRIL 2003
Affected Vehicles
1997-2000 Isuzu Hombre (TH) models equipped with a 4.3L engine, that are registered in California.
Service Information
Condition:
Some customers with vehicles that are registered in California may experience a "Service Engine Soon" light, misfire, and rough idle or hard start due to
a deposit build-up on the Sequential Central Port Fuel Injector (SCPI) poppet valve(s). The deposit build-up may cause injector poppets to stick closed.
Certain fuels have been found to interact with the SCPI system to cause the deposits.
Correction:
To correct this condition, follow the procedures for cleaning and servicing injector(s) to restore poppet valves to an as new condition. If the injectors
have previously been cleaned and the vehicle has again experienced sticking poppet nozzles, refer to Service Bulletin SB03-02-S003 and replace the
SCPI fuel assembly with the MFI fuel assembly.
Owner Notification
American Isuzu Motors Inc. (AIMI) will send a notification letter to the owners of affected vehicles notifying them of the terms of the warranty
extension; refer to Special Warranty Policy Adjustment towards the end of this bulletin. The letters will be mailed out on or about May 02, 2003.
Service Procedure
System Check:
Use strategy-based diagnoses listed in the front of the Driveability and Emissions section of the Service Manual. If the SCPI system is operating
properly, inform the customer that the vehicle does not have the condition listed in the owner letter. If poor driveability conditions persist, inform the
customer that any further diagnosis and repairs will be at their expense if the vehicle is outside the parameters of the New Vehicle Warranty.
SCPI Injector Cleaning Procedure:
If diagnosis leads to sticking poppet nozzles, use the service procedure from Service Bulletin SB03-02-5003 in order to clean the SCPI poppet nozzles.
Please note that the service bulletin term for SCPI is Central Sequential Fuel Injection (CSFI), but is referring to the same fuel assembly. If the poppet
nozzles have previously been cleaned and the sticking condition has reoccurred, refer to the correction paragraph below.
Correction:
If, after cleaning the SCPI poppet nozzles, the normal service manual diagnosis still indicates that the SCPI is the cause of the customer complaint, or if
the injectors have previously been cleaned and the vehicle has again experienced sticking poppet nozzles refer to Service Bulletin SB03-02-S003 and
replace the SCPI fuel assembly with the MFI fuel assembly. Please note that the service bulletin term for SCPI is Sequential Central Fuel Injection
(CSFI), but is referring to the same fuel system assembly.
