Hello and Welcome... my name is ***** ***** Im happy to help / advise..
I need to just first clarify - was anything done with the air mass meter then- and the timing belt - was that actually changed or not?
Too - do you have any systems fault light on the dash at all when its running?
Also - have any fault code checks actually been done? if so - do you have the codes?
Finally - what is the mileage on the car - ? When was it last serviced ? and please give me its FULL reg number-
When you come back on -please just list your reply here - answers to the above - and when I receive them, I will get back to you asap thereafter - Best Rgds, MIKE.................................
I bought the car with the idle problem. The car was due a timing belt change so I took it to garage and had the work done. I asked if they could look at the idling problem and they said that I would need to take it to a diesel specialist as it sounded like an injector problem. I spoke with a tuning company who said it should be sorted by a garage as it sounded like an air mass meter. So I took it to another garage. They could not raise any error codes but deduced that it was probably the Dual Mass Flywheel/clutch. I have now paid to have this replaced yet the problem remains and the car is increasingly down on power when accelerating through the gears. It hits a flat spot then feels like the fuel is suddenly kicking in. The last garage believes it is either the timing or injection system. I have since been referred to another Audi specialist who, after listening to my story has referred me on to another specialist company that focusses purely on injection issues.
Other than this problem the car drives perfectly. It is overdue a service and has done about 185k miles. The reg number if VN57 MKV
Hi again - Thank you for your reply and info... I just needed to be sure on those points - so thank you for that ..
You can get bad idle - sounds almost like a dead injector / misfire when you have a bad DFM / flywheel - but - that would clear on revs if it was the DFM... you say it was ok when on the road - so it was never going to be the flywheel Im afraid..
As the fault has been there before the belt was replaced - its unlikely to be timing out neither - though a simple 4 gas test on an mot machine can qualify that too... but its doubtful as its the same now -
The timing is computer / ecu controlled.... the valve timing by the belt so wev'e pretty much ruled that out - You could have an injector issue yes - but that should show on a fault code test - plus, you would get a engine fault systems light on the dash....so, I wouldn't at this stage think that way - not with no light and no fault codes.
That said - a fault code test should always be done for such a fault - it doesn't sound like anyone has done that yet - that needs doing. .. For now though - try this - disconnect the MAF ( the air flow meter ) electrical connector... secure it safe and take the car for a drive - It may idle bad like this ( or not ) - but if the general power is restored, thats a sure indication of a faulty MAF... so try that and let me know how you get on - then we can go on...
Best Rgds,. MIKE.........