AboutRon Wolff Expertise I am proficient in the following areas of VW Air Cooled Models from 1968-1979:
Vehicles: Super Beetle, Beetle, Thing, Karmann Ghia, Bus, Westfalia/Bus
Areas of expertise years 1968-1979
Engine Rebuild advice for all air cooled engines
VW Brake system replacement
Automatic Stickshift transmission
VW KOOL and DPD air conditioning systems (ex. thing)
Westfalia Electrical system dual battery
Westy Refridge Repair
Westy Cabinet Repair
Westy
AFC Fuel Injection system (1975 bugs) (1975 bus/Westys)
Soundproofing
General type 4 engine rebuild/technical data (i.e. 1.7 ltr, 1.8., 2.0) for buses
VW Air Cooled Beetle and Bus Paint codes
VW Distributor Compatibility Information
Westy component repair
Emission Systems
Exhaust Systems
General Electric System
Door rebuild (windows, seals, vent windows)
Body Panel Removal and general repair (non-welded)
Charging System
Convertible top Installation: Beetle
CV joints
Engine Troubleshooting
Valve Train
Non areas of expertise:
High Performance Modifications
Front end related components
Rear suspension (spring plate adjustment)
Bodywork / painting
Experience
Past/Present clients I often contribute to the westfalia users group technical boards. I have been a member for about 4 years. My usermame is 76Heatwagen
I restore vintage Volkswagens and currently own 4 of them.
Expert: Ron Wolff Date: 3/23/2007 Subject: Fuel System Error code Golf4 2.0
Question Recently I replaced the air mass flow meter on my Golf4 2.0L after diagosed by the agents as faulty. Since I replaced the air mass meter the car has been running well, however with cold starting the choke does not come on and the vehicle idles as per normal running conditions. The diagnostic report indicates a 40AC fault and fuel bank mixture too rich, this indicates that the Purge control valve may be faulty. It did not do this before the mass meter was replaced and I wonder if it warrants replacing this valve as it is a costly exersize and will this worsen over time? Please advise.
Answer Hey Mark,
If you are getting that 40AC code, either the fuel pressure regulator has a proglem or the purge valve may be at fault. I'd first check to make sure that you have a good seal everywhere, and all of the wires and hoses are on tight.
If after a system clear, this error still comes on, most likely you are going to have to replace the pressure regulator or the purge valve.
