v8bobber Posted January 29, 2015 Share Posted January 29, 2015 Hi all I have recently bought a Td5 Disco which isn't running right in that it will not rev past about 2500-3000 rpm. I have changed the injector loom and cleared out the oil in plugs as this needed doing anyway and changed the fuel filter too. I have checked the ECU and there is no oil in it. The vehicle starts and idles nicely and it is only when you try to take the revs past 2500 then it plays up. From much Googling it seems that it could either possibly be the wastegate modulator or the fuel pump on its way out. I have a nanocom which shows no faults stored. Any experiences of this? Cheers, Dave Quote Link to comment Share on other sites More sharing options...
Shackleton Posted January 29, 2015 Share Posted January 29, 2015 Check all the turbo pipes too, there could be a split there somewhere. Not just visually, get your hand around the back checking for holes. The wastegate is really easy to check, take the turbo heat shield off, remove the circlip from the arm and take the arm off. The gate should be completely unimpeded. Free it by working it but do not put any lubricant that will carbonise into it like WD40. It's not a hard rule, but usually if it's overboosting hard, the car will go into limp mode which you don't seem to have. Is the fuel pump loud? Quote Link to comment Share on other sites More sharing options...
Tanuki Posted January 29, 2015 Share Posted January 29, 2015 Check also for collapsed baffles/wadding in the exhaust silencer-boxes: if the exhaust gases can't get away freely the turbo's never going to have a chance to do anything useful. Quote Link to comment Share on other sites More sharing options...
Dave W Posted January 29, 2015 Share Posted January 29, 2015 Disconnect the AFM and see how it runs then Quote Link to comment Share on other sites More sharing options...
bear Posted January 30, 2015 Share Posted January 30, 2015 Whilst your checking pipes don't forget the 3 small bore ones on the wastegate modulator. Very common problem where the attach to solid pipes. Griff Quote Link to comment Share on other sites More sharing options...
Dave W Posted January 30, 2015 Share Posted January 30, 2015 Just noticed you have a Nanocom - check the AFM as I suggested, if that doesn't work, connect the AFM back up and run a logging session on the Nanocom inputs and post the resulting file - although it may not be reporting errors you can tell a lot about what's happening from the input log, including if the turbo is working. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 31, 2015 Share Posted January 31, 2015 Fuel pump is my guess, and low fuel pressure doesn't trip any fault codes, as the system can't self-diagnose that. You need to plumb in a pressure gauge to be sure. Quote Link to comment Share on other sites More sharing options...
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