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Thread: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ?

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  1. 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    Ok so I had my car mapped to 393 bhp from the standard 320 ( although it had been done to about 350 by previous owner unknown to me )

    itís gone into limp mode a few times now, when pushing it hard and thatís the fault code I got from vcds.

    ive spoken to the mapper, and he says itís not map causing this. Iíve looked about google and this forum but only find problems from older 3.0 diesels or vws.

    the main cause Iím reading is high pressure pump or the sensors.

    my questions are these.

    is this relatively easy work to be done and would any garage be able to do this ?
    if not, who would you recommend in the south west ( nr Bath / Swindon / Salisbury?

    cheers all
    C7.5 A6 black edition BiTdi
     
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  2. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    My first though is - Could the remapped engine be consuming more fuel than the pump is capable of supplying at the requested pressure?
    Other than that it could be the rail pressure sensor, the rail pressure adjustment valve, the pump quantity adjuster valve, the pump itself, or the supply of fuel from the tank, ie tank pump and fuel filter.

    If you have VCDS, look at the rail pressure in measuring blocks - if it's jumping around all over the place for a given engine revs and load, there's problems. In my very limited experience of diagnosing these sort of things on VW vans, the pressure adjuster is the most common failure for causing erratic rail pressure, but to prove this beyond doubt needs specialist diesel diagnostic equipment. (On the VW's, there is enough collective data to assume the likelihood of order of failures) But by no means assume the A6 3.0 engine will have any common failures with a VW T5.1 2.0 engine.
     
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  3. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    It really sounds like your remap is the issue. 393bhp is on the high end of the scale of what a bitdi would remao to. 370-380 is the norm. Going into limp mode after your pushing it with a fuel starvation issue is quite obvious.
    Rempa guy should be standing behind his remap and not fobbing you off which it looks like he is. Get him to remove it and see how the car behaves. A good mapper should happily do this and wok with you to prove that his map is working within parameters.
    Who did the remap?
    A6 BiTdi Avant MTM
    Retrofitted: Full Led Headlights, DAB, Full Electric Seats, Power Tailgate, Surround View Cameras, Genuine RS6 Grille, RS6 Seats,Leather Door Armrests, Soft Close Doors, Rear Side Blinds, Electric Steering Column, LED Sill plates,Ambient Lighting Pack, High Beam Assist, Eibach Springs, Led Roof Console, 4 Zone Climate, Rear Heated Seats, Head Up Display, Side assist, Alcantara Interior Retrim
     
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  4. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    Hi Morski.

    it was bevo in Plymouth. He has a 4wd rolling road which is why I went there. The car had already been done to 350 bhp which I was unaware of.
    the car had no issues at all before the map.
    42C5B077-0C1E-497F-B465-CA9AE64AFE05.jpg
    C7.5 A6 black edition BiTdi
     
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  5. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    Quote Originally Posted by Heathy View Post
    Hi Morski.

    it was bevo in Plymouth. He has a 4wd rolling road which is why I went there. The car had already been done to 350 bhp which I was unaware of.
    the car had no issues at all before the map.
    42C5B077-0C1E-497F-B465-CA9AE64AFE05.jpg
    I am with Morski. The re-mapper must know heís pushed the car, for his own experience he should be interested in the success or failure and correcting.

    For what itís worth Iíve mapped my BiTDi, using Revo, conservative by comparison. I chose that map intentionally to stay in safe limits.

    Have you made the other mods like air filter, Wagner intercooler?

    Iíve got to ask, what influenced you to ask for such a high map?


    Sent from my iPhone using Tapatalk
    A6 Avant S-Line BiTdi | born Sept '13 | advanced tech pack | sports diff | privacy glass | 75l fuel tank | lighting pack | HB assist | rear cam
    Q5 S-Line Plus TFSI | born April '11 | tempted to add stage 1 Revo taking HP from 177 to 290.
     
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  6. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    I didn’t specify what I wanted from the car. Maybe I should have. To be honest I went in without knowing what’s what. No mods to the car at all.
    C7.5 A6 black edition BiTdi
     
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  7. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    Quote Originally Posted by Heathy View Post
    I didnít specify what I wanted from the car. Maybe I should have. To be honest I went in without knowing whatís what. No mods to the car at all.
    Itís really worth reading, so much experience across the forums now for remapping this car.

    Iíd expect any good mapper would be asking what you want from a remap, and explaining what they will do. And even if you want such a high outcome, explain the risks. From the forums remapping this car over ~365 would usually carry recommendations of additional mods, so again surprised if your mapper didnít.

    While Iíd potentially ask your mapper to correct, do you think they care? Perhaps in the first instance ask if he can revert the map back. Otherwise Iíd be reading up and taking it to one of the tuners referenced across the forums, who have good reviews and experience of the bitdi. Or a tame map like my Revo.

    Crap to have laid money down, trusted and now this... and why using the forums really helps.

    Do others agree with my thoughts? Any other perspectives to help Heathy out?


    Sent from my iPhone using Tapatalk
    A6 Avant S-Line BiTdi | born Sept '13 | advanced tech pack | sports diff | privacy glass | 75l fuel tank | lighting pack | HB assist | rear cam
    Q5 S-Line Plus TFSI | born April '11 | tempted to add stage 1 Revo taking HP from 177 to 290.
     
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  8. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    Thanks for your help Razor.
    tbh I’m happy to chalk it up and move on with this. I don’t mind driving a few hours to another rolling road mapping company. Any you would recommend?

    I can do London, south west, Birmingham area even wales if need be.
    C7.5 A6 black edition BiTdi
     
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  9. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    I think the simplest and most satisfying outcome would be to get the supplier you already used to put something a bit less aggressive on. How did you discover it had been mapped to 350BHP? If he saw that and thought your general instructions must want at least another 10% to make it worthwhile then that'd explain how you ended up where you are. If they can put a 365BHP map on you're getting a very modest increase on the 350BHP, but at least you have something for your money.
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  10. Re: 16 BiTdi fuel rail pressure to low fault after remap - best garage in the southwest ? 
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    Just go back to him and ask him to take it off as you want to get the car repaired and eliminate any possible issues be it a remap, air filter or an air freshner.
    Once removed leave it as is and see how it behaves and then once your happy the car is ok go for a reputable map or if not get the car repaired.
    A6 BiTdi Avant MTM
    Retrofitted: Full Led Headlights, DAB, Full Electric Seats, Power Tailgate, Surround View Cameras, Genuine RS6 Grille, RS6 Seats,Leather Door Armrests, Soft Close Doors, Rear Side Blinds, Electric Steering Column, LED Sill plates,Ambient Lighting Pack, High Beam Assist, Eibach Springs, Led Roof Console, 4 Zone Climate, Rear Heated Seats, Head Up Display, Side assist, Alcantara Interior Retrim
     
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