Cutlass Ciera Cruiser V6-231 3.8L (1985)
Fuel Injector: Technical Service Bulletins
Fuel - On-Car Injector Cleaning Procedure
SUBJECT
ON-CAR MPFI INJECTOR CLEANING PROCEDURE
NUMBER: 85-T-47
DATE:
October 10,1985
MODELS/YEARS
1984 CUTLASS CIERA; 1985 FIRENZA,
CALAIS, CUTLASS CIERA & NINETY-EIGHT
SECTION: 6C
WITH 2.8L 3.0L & 3.8L V-6 ENGINES
Whenever a driveability condition is encountered on a MPFI equipped Oldsmobile, obvious items such as a disconnected vacuum hose or disconnected
spark plug wire should be checked. Then, prior to any system and/or component diagnosis, the injector cleaning procedure as outlined in this bulletin
should be performed.
Various types of injector cleaning equipment are available to clean injectors on the car; however, the following procedure was developed using the
Kent-Moore J-35800 Fuel Injection System Cleaner to be available approximately November 11, 1985. Follow the equipment manufacturer's
instructions for introducing the solution to the fuel rail.
To clean injectors effectively, use a solution of 95 percent gasoline and 5 percent GM Top Engine Cleaner, part number 1050002 or AC Delco
Carburetor Tune Up Conditioner, part number X66-P (16 oz. cleaner and 2 gallons of gasoline). Use 1-1/2 quarts of the solution for adequate injector
cleaning.
IMPORTANT:
DO NOT EXCEED THE 5 PERCENT CONCENTRATION OR 1-1/2 QUARTS OF SOLUTION TO PREVENT POSSIBLE
DAMAGE TO THE CAR'S FUEL SYSTEM.
NOTICE:
DO NOT ADD GM TOP ENGINE CLEANER OR AC DELCO CARBURETOR TUNE UP CONDITIONER TO VEHICLE'S
GASOLINE TANK, AS DAMAGE TO FUEL SYSTEM MAY RESULT.
SERVICE PROCEDURE:
IMPORTANT:
The fuel system MUST hold system pressure for this procedure. If the system does not hold pressure, repair as required.
1.
Mix 16 ounces of GM Top Engine Cleaner or AC Delco Carburetor Tune Up Conditioner with 2 gallons of clean no-lead gasoline.
2.
Put 1-1/2 quarts of this solution into the cleaning equipment container and pressurize to 25 pounds pressure with outlet valve closed.
NOTE:
DO NOT EXCEED 25 POUNDS PRESSURE.
3.
Connect cleaning equipment to fuel rail pressure test port.
4.
Cycle ignition switch to energize fuel system prime cycle.
5.
Open outlet valve of cleaning equipment.
6.
Cycle ignition switch again and observe pressure gage. Pressure will read approximately 40 pounds and hold steady. If pressure drops to 25
pounds, (solution container pressure) repair vehicle fuel system for pressure loss.
7.
Disable the car's in-tank fuel pump. On some cars it may be necessary to disconnect the connector at the fuel tank.
8.
Start engine and run at approximately 2,000 rpm until the solution is used up and engine stops running (approximately 15 to 20 minutes).
9.
Turn ignition switch off, close cleaning equipment outlet valve, disconnect cleaning equipment, install fuel pressure test connector cap, and
reconnect car's fuel pump.
10.
Start and run engine to verify idle quality and check for leaks.
WARRANTY INFORMATION
Trouble Code
Labor Operation
Labor Hours
78
T4085
.5
If the driveability condition still exists after cleaning the injectors, diagnosis using existing chassis service manual procedures should be performed.
