We have more information. We have tested pressure on the rails. The passenger side rail is OK but the drivers side rail is low pressure. Blocking of injectors the pressure is still low. We now suspect the pressure release valve but have replaced this with one from another vehicle (not the correct one but it should be shut )and still have the problem. Could the ecu be affecting this valve and still show no code. Could the valve be faulty and show no code? If not where else can we be losing pressure? The connecting pipe between the rails has been blocked off so that is not the cause.
We are still at this stage we have ordered a correct replacement pressure release valve and are awaiting delivery of this.
The pressure release valve arrived and did not solve the problem. We have already replaced the fuel filter and had the immobilizer checked by an Audi main agent it is OK. we are currently having the injectors retested.
We also rechecked the timing but it is OK as per the tool. We are completely baffled. Any other ideas?
Hello again David - Thank you for your reply.The immobilizer is easy to check - you just check the LED to see what its doing at the time.. If thats ruled out - its either a fueling issue - so you need to check pressure etc.. or, an electrical / command problem.. meaning then you need to check relays / wiring / to ecu.I doubt its an Ecu fault - but it could be.. I would suggest check as above to work through this. These models are susceptible to water damage to the Ecu and its main relay etc. One wouldn't think such would happen with what you have been doing - but its worth checking... Let me know how you get on..Im always happy to help further if needed..... Rgds - MIKE.Please do click on the OK ratings for me at this point - Thank you David.You can get back to me anytime you may need further - clicking the OK ratings does not close you out at all..