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Thread: Allroad 2.5 tdi starting running lumpy

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  1. Allroad 2.5 tdi starting running lumpy 
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    I have an allroad 2.5tdi engine code bau. In the last few days it has started to run lumpy. It has an apparent miss or stutter when idling. Additionally it has started to smoke and has that acrid unburnt diesel smell. It doesn't occur at start up but once you are underway it quickly starts missing. I have checked and no fault codes come up. The dynix pump timing is quite near the bottom limit. Other than that the maf seems to jump around alot. I tried a spare one and it was no better. There is no air in the pump feed either. Waiting for a filter to arrive as it is due for one anyway but I doubt that will fix it. Anyone have any ideas on what to check. It is still driving OK so it's not serious but does seem to be getting worse.

    Cheers Mike


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  2. Re: Allroad 2.5 tdi starting running lumpy 
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    Check pump timing

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  3. Re: Allroad 2.5 tdi starting running lumpy 
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    I have done a a couple of longer journeys and the problem seems to be getting worse. It is intermittent though. For instance when first starting up it ticks over lovely. Once warmed or after being used it starts to miss and run lumpy. I have not done a static engine timing check but when I put the vcds on it and checked it there I was getting about 14.8 degrees and 3.6 degrees. There is very little fluctuation from this. Even when the miss fire was present. The one thing I did observe was that the one of the cylinder deviation quantities was higher than suggested. About 6. 2 were just below 5 and one was about 0. I am clinging to the hope it's an injector issue as the pump is very expensive to recondition. I have a second set which is at the diesel specialist for checking before I swapped them out. I have read of some other people having issues with the pump but it did result in poor drivability which other than smoking alot mine doesn't have. The diesel specialist also said that when the pump fitted fails it usually results in it just not allowing the engine to start. Before I start digging deeper is there any thing else to check?


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  4. Re: Allroad 2.5 tdi starting running lumpy 
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    Get it fully hot and in basic settings 04, display group 004, when display zone 4 shows 100%, zone 3 shows "retarded", zone 3 should show 2 ATDC 2 but as close as possible to 2 ATDC is recommended. The VCDS timing checker works well but remember the way measuring blocks displays the value as -2 BTDC is confusing.

    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  5. Re: Allroad 2.5 tdi starting running lumpy 
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    So got all the parts together such as seals etc and swapped the injectors today. They are second hand but I had a local diesel speciailst check them first. The car is now so underpowered it's undriveable. I did change the fuel filter and bypass valve for new ones at the same time but they are all new items. Had a check of the timing when it switches to late around 4 deg it's very lumpy. I am planning on putting the old injectors back in tomorrow and see how it goes with them. I have given them a wire brush at the ends so fingers crossed that will make it drivable again. I am still erring on the side of the pump being at fault. Any recommendations?


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  6. Re: Allroad 2.5 tdi starting running lumpy 
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    Nooooooooo, wire brushing kills them, don’t ask how I know…

    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  7. Re: Allroad 2.5 tdi starting running lumpy 
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    Well it's no better. As I have wire brushed the ends of both I now have 2 knackered sets of injectors it seems. It will not rev has no power and smokes like a chimney. I am beginning to get annoyed with this now. The more I try the worse it gets. How do you mean wire brushing kills them? Do they run at all or just badly like mine is now?

    Checked the timing again but the cold start valve value hovers around the 50-60% mark even when hot. The timing is around 2 degrees but is fluctuating alot. Plus or minus 1 degree.

    When I eunit in basic settings the cold start valve does go to 100% for the late timing and it is around 4 degrees timing


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  8. Re: Allroad 2.5 tdi starting running lumpy 
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    Many years ago I fitted two genuine revised heads to an early 8E 2.5 quattro which changed it from the unreliable non roller cams to the later spec as a number of the fingers had been thrown out and the tops of the valves destroyed. I tickled the injectors in the wire wheel thinking I was doing the right thing and the engine went from down on power to zero power and black smoke. I called my friend Daryl at Gee Diesel in Hucknall for advice and relayed the job, he called me a rude name and told me to bring the injectors over… problem solved

    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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