Engine - Idle Fluctuations or Hunting

87VW04

GROUP

25

NUMBER

87-07 August 24, 1987

MODEL(S):

All 1.8L WaterCooled Engines, all m.y.
SUBJECT:

Unstable idle/hunting - All

1.8L water cooled engines

Supercedes Technical Information Group 25, 87-03 of July 31, 1987.



Idle fluctuations or hunting can be caused by a vacuum leak in the air shrouded injection system. Possible causes:

- Distorted O-Ring
- Distorted or cracked plastic connecting flange

^ Install white connecting flange, Part Number 049 103 499G, and green O-Ring, Part Number 026 103 487A.
Production Change:

Press fit steel pipe installed in place of plastic connecting flange as of:

9/85 VIN 16GW243946 - Jetta 15GK006942 - Cabriolet 53GK009480 - Scirocco 17GV021483 GTI 12/85 VIN 3 GE087819 - Quantum 17GV029444 Golf KE w/auto trans
Note: Steel pipe used in production cannot be service installed.