Engine - Pulsating or Clicking from RF of Vehicle
GROUP: 24NUMBER: 94-04
DATE: February 9, 1994
SUBJECT:
Pulsating, clicking sound from engine or right front of vehicle
Model(s):
Golf III, Jetta III, From 1993 M.Y.
CONDITION
A prominent clicking, pulsating sound coming from the EVAP Canister Purge Regulator Valve (N80), or in vehicles so equipped, from the EGR Vacuum Regulator Solenoid Valve (N18). The situation may exist on one system or can be a combination of both. Hoses hardened by lower ambient temperatures can transmit normal valve pulsations into the body of the vehicle.
PRODUCTION
The EVAP Canister Purge Regulator Valve-to-EVAP Canister hose has been changed to the softer rubber hose as of VIN 3VWRA218RM021853.
SERVICE
EVAP Canister Purge Regulator Valve
- Check the hose connecting the EVAP Canister Purge Regulator Valve (N80) (Figure 1) to the EVAP Canister. If it is clear hard plastic, replace with hose Part No. 535 201 179 (remove 100 mm from the straight end of the replacement hose before installation).
USE HOSE CLAMPS:
Part No. N024 528 1 at EVAP Canister Purge Regulator Valve end
Part No. N101 393 01 at EVAP Canister end
EGR VACUUM REGULATOR SOLENOID VALVE
EGR Vacuum Regulator Solenoid Valve (N18) hose routing modifications are also necessary to ensure that valve pulsations do not transmit into the vehicle.
- Re-route the EGR Vacuum Regulator Solenoid Valve-to-EGR valve hose and the EVAP Canister-to-fuel tank hose as shown in Figure 3.
- Secure the EGR Vacuum Regulator Solenoid Valve-to-EGR Valve hose to the vacuum source hose using retainer
Part No.191 201 449.
Note
Please contact the VW Helpline if there are questions about this modification.
Caution
Part numbers are for reference only. Always check with your Parts Dept. for the latest information.