INFO. ON 4.3L 'CTF' ENGINE (VIN W - RPO L35). Chevrolet S10 Pickup

SUBJECT: INFORMATION ON 4.3L "CTF" ENGINE (VIN W - RPO L35)

MODELS: 1994 CHEVROLET AND GMC TRUCK S/T UTILITY MODELS 1994 OLDSMOBILE BRAVADA

VEHICLE PRODUCTION FROM PONTIAC WEST ASSEMBLY, BEGINNING SEPTEMBER 19, 1994 THROUGH THE END OF THE CALENDAR YEAR, WILL CONTAIN A 4.3L V6 ENGINE (RPO L35) REQUIRING SPECIAL SERVICE CONSIDERATIONS.

1. VEHICLES WITH THIS ENGINE ARE IDENTIFIED BY THE FOLLOWING:

A. PONTIAC WEST ASSEMBLY (VIN 11TH DIGIT = 0) PRODUCTION STARTING WITH: MODEL NAME VIN ---------- --- CHEVROLET BLAZER 1GNDT13W4R0166573 GMC JIMMY 1GKDT13W0R0524491 OLDSMOBILE BRAVADA 1GHDT13W0R0704558

B. A SPECIAL LABEL HAS BEEN AFFIXED TO THE RADIATOR SHROUD; IT READS:

**ATTENTION GM SERVICE PERSONNEL:** THIS 1994 GM UTILITY VEHICLE IS EQUIPPED WITH "RPO CTF."

THE AUTOMATIC TRANSMISSION USES DEXRON{R}-III AUTOMATIC TRANSMISSION FLUID (ATF).

REFER TO GMSPO PARTS CATALOG FOR "CTF" SPECIFIC ENGINE, TRANSMISSION, CONTROL MODULE AND WIRING HARNESS SERVICE INFORMATION.

C. THE SERVICE PARTS IDENTIFICATION LABEL (RPO LISTING) WILL INCLUDE THE "CTF" OPTION.

2. A SERVICE DOCUMENT (APPROXIMATELY 475 PAGES) ENTITLED **S/T TRUCK 1994 SERVICE MANUAL SUPPLEMENT (WITH RPO CTF)** (NATP-9444/ 29S) HAS BEEN DEVELOPED AND SHOULD HAVE BEEN DISTRIBUTED TO DEALERS BY THE END OF SEPTEMBER 1994.

3. THE ENGINE AND TRANSMISSION (REFER TO SERVICE MANUAL SUPPLEMENT).

A. THE ENGINE IS A 1994 L35 UNIT WITH SOME 1995 L35 ENHANCEMENTS. TWO ENGINE ASSEMBLIES ARE USED: ENGINE GOODWRENCH BODY B/C PART NUMBER ---- ------ ----------- S TKF SEE GMSPO CATALOG "CTF" OPTIONS T TKH LISTINGS (NOTE 5 BELOW)

B. THE ENGINE **IS NOT** OBDII EQUIPPED, ALTHOUGH IT MAY SHARE SOME OF THE SAME HARDWARE.

C. THE TRANSMISSION IS VERY SIMILAR TO THE STANDARD 1994 VERSION, BUT HAS AN INTERNAL PWM SOLENOID (TCC LOCKUP). TWO TRANSMISSION ASSEMBLIES ARE USED. TRANSMISSION SERVICE DRIVETRAIN B/C PART NUMBER ---------- ------------ ----------- 2WD 5TZD SEE GMSPO CATALOG "CTF" OPTION 4WD 5TYD LISTINGS (NOTE 5 BELOW)

4. DIAGNOSTICS (REFER TO SERVICE MANUAL SUPPLEMENT)

A. MOST SERVICE DIAGNOSTICS ARE APPLICABLE TO VEHICLES WITH THE "CTF" OPTION. DIAGNOSTICS INCLUDED IN THE "CTF SERVICE MANUAL SUPPLEMENT" ARE PREFERRED/REQUIRED WHEN LISTED.

B. THE USE OF A TECH I WITH 1994 SCREENS SHOULD SUFFICE FOR MOST DIAGNOSTIC WORK. THE 1994 SCREENS WILL NOT ADDRESS THE PWM TCC.

5. SERVICE PARTS INFORMATION "CTF" RELATED SERVICE PARTS ARE IDENTIFIED IN GMSPO CATALOGS DATED OCTOBER 1994 AND LATER.

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GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.