Volkswagen Transporter Engine Problems

The Transporter can be converted economically and successfully with the traditional mixer technology, which is cheaper than the current injection technology and that equates to a reduced breakeven mileage. Before you convert, however, you should make sure the vehicle is in good working order and you need to understand how long you will need to own and drive the vehicle to get your money back.

THEY can't.. We contacted VW and were told that, while the company recommends you run the higher octane because it performs a little better, the vehicle will run perfectly well on ULP. The choice is yours.

I don't believe the problem is related to the engine itself, instead I would be looking at the fuel and electrical systems.

Check the PCV valve, it might need replacing. A faulty PCV valve can cause a problem like you are describing.

Check the catalytic converter to make sure it hasn’t collapsed internally and is blocking the exhaust flow.