Engine Runs Rich: Check ECM & O2S Ground Connections (GROUP 24, NO. 93-10)
Publication date: 1993-12-15Reference number: GROUP 24, NO. 93-10
ENGINE RUNS RICH: CHECK ECM & O2S GROUND CONNECTIONS
TECHNICAL SERVICE BULLETIN
Reference Number(s): GROUP 24, NO. 93-10, Date of Issue:
December 15, 1993
RICH ENGINE RUNNING CONDITION
Model(s): 1990-93 Volkswagon Cabriolet With Digifant MFI
Group: 24 - Multiport Fuel Injection
Bulletin No.: 93-10
Date: December 15, 1993
CONDITION
A rich engine running condition may be caused by an improper or loose Engine Control Module (ECM) and Oxygen Sensor (O2S) Ground (GND) connection.
SERVICE
- Check the Ground (GND) connection on the engine at the coolant flange mounting stud. See Fig 1 -arrow-.
- Ensure that the coolant flange mounting stud is installed tightly in the Cylinder Head and tighten if necessary.
- Torque to 10 N.m (87 in-lb)
- Ensure that the Ground (GND) Connection on the stud is clean and tight. Clean and tighten the Connection as necessary.