Jetta L4-1781cc 1.8L SOHC (RV, PF) (1989)
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Fuel Injector: Customer Interest
Engine - Rough Idle, Stalls, Bucking, Poor Acceleration
GROUP
24
NUMBER
89-01
March 31, 1989
MODEL(S):
Jetta, 1987 - present Golf, 1988 - present
SUBJECT:
Digifant II:
Fuel injection system cleaning and intake valve decarbonization
Vehicles equipped with a Digifant fuel/ignition Management system sometimes experience driveability problems such as rough idle, stalling, bucking, or
poor acceleration, primarily during warm-up. Driveability problems are frequently related to the use of gasoline with insufficient cleaning additives
which will lead to the following conditions:
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Fuel injector gum-up, fuel injector tips clogged by varnish and carbon deposits
^
Carbon build-up on intake valves and/or intake ports
This Technical Information Bulletin (broken into 4 steps) provides repair information to eliminate the driveability problems described above.
Step 1. Preliminary Checks, page 2 Step 2. Carbon Build-up Diagnosis, page 2 Step 3. Fuel Injection System Cleaning, page 3 Step 4. Carbon Build-up
Removing, page 6
Required Tools
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VW 1367 Engine Tester
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SUN 105 Exhaust Analyzer SUN 120.239 Adapter Hose
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US G16 Kit for Cleaning CIS Injection Systems and Adapter Fitting for Digifant
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VW 1318 Fuel Pressure Gauge and VW 1318/17 Adapter Hose for Digifant
^
flex light (high intensity)
^
inspection mirror
Note:
