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Thread: Audi A4 1.9 TDI (1999) - power loss...limp mode?

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  1. Unhappy Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    Hi,

    I have been suffering a really annoying problem ,which I still havent managed to solve.

    It happens whilst driving over 60mph, especially noticeable going uphill , where the car doesnt seem to go any faster even with my foot to the floor. The revs stay constant and under 3k rpm, although a drop down to 4th gear doesnt increease speed, but just gives resistance. Used to be v noticeable until I swapped out the MAF, where it runs smoother but still feels as though the turbo isnt kicking in fully. Had only 1 code on a VAGCOM scan, showing something like 'signal too low' on the MAF, hence I swapped it out (costly at 80 quid).

    I have taken to an independant specialist, who cleared the code and now even with no errors from the ECU, still runs poor. Checked hoses, pipes for cracks, but nothing from what I can tell. Also been advisd it could be variable vanes on the turbo. Ordered a 40 quid turbo cleaning kit from Innotec, so will see how that goes in the next few days.

    Any ideas what else it could be, if it isnt the variable vanes? some ppl have mentioned the EGR, or N75, just wanted to know if anyone has had a similar experience and if there is a cure to this annoying problem. It used to go like a rocket, now I'm suffering being overtaken by micras. please help before I resort to getting rid.

    thanks in advance
     
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  2. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    Have you tried changing the fuel filter? Alot of people forget to check the basics ?
    Alan.

    A6 Avant (C7) 3.0 TFSI Quattro S-Tronic
    APR St1 Custom Exhaust - now gone
    VW T6 150 DSG Camper £££
     
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  3. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    well I recently had a full service following a cylinder rebuild (cambelt snapped, so needed new valves, hydraulic lifters and cambelt kit). That was around 3k ago, so the fuel filter was apparently swapped out then. Is there a possibility that during wear in of the new engine components, that it could have clogged the new fuel filter? I dont want to rule out possibilities so long as I dont have to spend too much.
     
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  4. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    I get the same issue, especially when going up hill, mines a 1999 (110) tdi, i have to switch off then on again to get it back working quickly....

    I have replaced my turbo tho, as mine went bang, let me know how the vnt clean kit goes..... i have the orig EGR valve and N75 still on mine as it was going fine until turbo was replaced so doubt egr and n75
     
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  5. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    Ok so fuel filter should be fine then. I would have thought if the VVT vanes were sticking, you should get a fault code. But once ignition turned off this code may be erased.
    You mention hoses being checked, i take it they included Boost hoses and intercooler etc. Also, have a look at air filter for it being unserviceable, obstructed. If you rev up engine while observing boost hoses, do they baloon up, then settle down a bit while revs held at a high rpm ? This would show to some degree that the vanes are moving as you approach max. boost and settling back.
    Alan.

    A6 Avant (C7) 3.0 TFSI Quattro S-Tronic
    APR St1 Custom Exhaust - now gone
    VW T6 150 DSG Camper £££
     
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  6. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    I will check the air filter and boost hoses tonight. the turbo cleaning kit should arrive today. Apparently I dont need to take off the turbo from the engine, but just disconnect from where it connects to the manifold. This may sound like a daft question, but does anyone know how to do this? Innotec say that I just need to spray into the manifold end (where it connects) into the turbo. The support guy on the phone said that should unfreeze sticky variable vanes and actuator lever.

    would be v grateful for any photos so I can see which bolts to undo, etc. I have a reasonable degree of mechanical competance, but dont want to get myself in a situation where I make things worse. Any help appreciated!!!

    Worst case, I could always take the cleaning kit to a mechanic, but feeling quote broke after spending so much already!!
     
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  7. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    still waiting for my turbo clean kit to arrive, but having put fuel system cleaner on my last fillup at the petrol station, the car seems to be running a lot smoother, and when going downhill, esp on the motorway, it seems to pull away fine and accelerates to around 90-ish before it struggles and then doesnt get much past this.

    going UPHILL....massive difference...the car struggles even when downshifting to compensate the turbo lag, so im thinking that could that still be a variable vanes issue? surely if I am going fast downhill, and I can feel the turbo kick in, although not as potent as it used to be, then the uphill struggle must be down to something else?

    also, any ideas how I can remove the turbo from the manifold end, just enough so I can spray in the turbo cleaner? any photos would be most appreciated or any advice on how to go about this.

    thanks in advance
     
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  8. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    hi there, i have the same problem with my 1999 1.9tdi a4, have changed MAF and mechanic removed pipe from egr valve, improved slightly after meter was changed. have to change gear at 2000revs or power drops badly in next gear, needs switched off to reset
    let me know if you solve your problem and how, i too have been overtaken by a micra but i had a full car at the time, still havent lived that one down lol
     
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  9. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    Ok I've now received the turbo cleaning kit. Having followed the instructions and tried to remove the 3 bolts on the exhaust manifold which connect the turbo, they are completely seized. Another issue is that I dont have much room to use a socket wrench, although I'm sure I will need to go to a garage now and get them to loosen the bolts, before I have another go.
     
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  10. Re: Audi A4 1.9 TDI (1999) - power loss...limp mode? 
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    ok had a garage perform the turbo cleaning, as I couldnt unseize the bolts, but now that they have had a go and advised a lot of gunk came out of the turbo, but no joy, as I STILL have limp mode. Not happy....thought this would have been the issue, and cant think what else it could be. Could someone PLEASE PLEASE give me some advice, as I dont want to blow more money trying to get it seen to. Audi have had a go but nothing came up on a scan, so they wanted 2-3 hours of time to investigate further ...not cheap at 110hr. Surely someone has had this problem before and been able to solve it easily?
     
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