Golf GTI L4-1781cc 1.8L SOHC (HT) (1985)
Technical Service Bulletin # 258603
Date: 860501
CIS With OXS System - New Checking/Adjusting Procedures
Applies To
GOLF
JETTA
1985-1986
Group
25
Subject CIS With OXS System
Part Identifier N/A
Key Points New checking/adjusting procedures
Supercedes Product Circular, Group 25, 86-02
A228
Number
86-03
May 7, 1986
Note
The 1.8L "GX" engine will be offered in two versions. One version with CIS/E and a second version with CIS.
For repairs on the CIS injection system Group 25 "CIS" applies, as well as the repair instructions listed here.
Idle Adjusting
Note
Idle speed, ignition timing and OXS-duty cycle (CO value) must be checked and adjusted together.
^
The oxygen sensor must remain connected during testing or adjustment
Testing and adjustment conditions
^
engine oil temperature min. 80~C (176~F)
^
electrical consumers turned off (including radiator fan)
^
A/C off
^
fuel pressure measuring equipment not connected
^
if fuel lines were disconnected or replaced, bring up idle speed to 3000 rpm several times and let engine idle for at least 2 minutes
^
there must be no leaks in exhaust system
^
oxygen regulation OK
-
clamp hose (1) of idle speed boost valve together tightly
-
pull off crankcase breather hoses and place so that only fresh air can enter
^
hose (2) from intake manifold