jack7531

hi guys,well l am no further forward,engine light is still on,l still lack power,the idle speed is 750 not 950,my bad,l have stripped and cleaned the maf sensor-how do l test that by the way?-the studs for the egr valve are siezed,so its off with the manifold/turbo,so l can get at them better,l have a tiny amount of play in the turbo,so l will have to get to that soon,l found the turbo boost valve,looks ok but l plan to change it anyway,alternator output seems to be fine,the truck feels like its holding back,-could l have a timing problem?,it runs okay otherwise,little or no smoke,starts fine (starter is lazy but l can live with that for a bit),l was going to fit a straight through centre pipe,till l found that they cost more than the centre muffler box!!!,not sure how that works,a straight pipe costing more than a built up box,not sure what to try next,l feel its something stupidly simple but l cant find it!,cheers all,jack.

Ok ally,if the current batch of wind/rain ever lets up,l will get to work with my trusty voltmeter,just noticed,your not far away from me,l am in chepstow,small world innit(l believe is the expression),while the guy was doing the test,l noticed she stumbled once or twice,just a quick hiccup then back to a smooth idle,not done that before,gone now,l plan to replace the lift pump anyway as it feels like the existing one feels like its not pumping,though l guess it must be doing something or she wouldnt run at all,cheers for now,jack.

Forgot to say,the turbo boost sensor is also suspect apparently!!!!!,cheers,jack

Hi again guys,well the diagnostic didnt flag up much,only two items-fuel temp sensor and air flow meter temp....fuel temp showed a minus value(0.37 l think),while the maf seems to think l am somewhere in death valley,showing a figure of +50 degrees,clearly both cant be right,the temp here in sunny south wales is barely into double figures,so it looks like l need to replace that at least,the guy who did the test tells me that the fuel temp sensor is inside the injector pump and cant be changed,l am having trouble getting my head around that??,just a few facts/figures l think l forgot to mention:-my truck is a 1997,automatic,300tdi,.......theres no real sign of smoke on hills,l am told that it wont start if the crank sensor is faulty,can the maf be repaired or do l just replace it?,thanks for all the help guys,it really is appreciated!!!

Hi guys and thanks for the responses,l dont have a turbo gauge anywhere l can see,so l guess there isnt one,l get a little smoke on starting from cold,this then reduces to practically zero,l have had it suggested to me that l should fit an egr removal kit-this is now on order,also a de cat front pipe-l dont seem to have a cat in the front pipe so assume a previous owner has done this already,where do l find the crank sensor?,l have had a look but cant see anything that looks like a sensor,or is it buried somewhere horrible?,if 950 rpm is too high what should it be?,iit sounds pretty good idling at that!!,l am about to give it a darn good service,and also change the lift pump,some of the bushes in the throttle linkage have a heck of a lot of slop and play which cant be helping,so l intend to rectify that asap,l have it booked in for a diagnostic this week,hopefully that will reveal why the light is on,she doesnt overheat or pressure up,oil consumption is zero as is coolant,fuel is another matter altogether!!,l dont expect a lot,but l have worked it out that l am averaging around 22mpg,l was kind of looking for around 25-30...will post the diagnostic results when l have them,cherrs for now all,jack

Hi all,l am new to this site and discos in general,my 300tdi starts and runs fine,idles at 950 nice and smooth,drives okay till l come to any sort of a hill,l then seem to lose power,kicking the autobox down helps a little but not much,l also have a check engine light on constantly,l cant find any problems,so l am wondering if maybe there is a sensor of some sort that maybe playing up??,other than that she is fine,saggy headlining notwithstanding,cheers all,jack.