Thread: TD5 sticking at 3,000 rpm

So I wound boost back another 3 turns this evening and had to do run to airport. Boost gauge now down to max 16 when was getting past 20.

Point to make which may identify more is that I floored it from lights entering ring road, in 3rd, stuck at 3,000 but it feels like it wants to do more, wait about 5 more seconds, changes to 4th, shoots along gaining speed for about 3 seconds, then changes back to 3rd again, then another 3 seconds, ease off slightly, back to 4th and off we go for good.

Does this help at all. It has been doing this throughout the problem regardless of where the boost was set at ?

the MAP reading would be interesting though...or do you have a boost box fitted?

No boost box, I wound the boost back some more and she is going really sweet, best in a couple of years, the problem is there still, but running so much better and no overboost at all. I have played around with 1 x turns, up and down and have pretty much found the best spot. Sure the wastegate is working, I also cleaned the AAP sensor that goes into the air filter.

So so think I will have to now get a live test done on the nanocom to see if can find out more, wish I knew a handy expert who knows Disco's backwards (anywhere in Melbourne) and would be happy to take to them to have a drive and see what they think. Also filled up lat night and will be very interested to see if the economy has improved, car seems so much happier picking up speed now is effortless, but still sticking at 3,000 then hits 4th and whosh.

one last thing I have noticed is when going up a hill, it will change up and a great surge of torque, but as soon as I hit the top and hill levels off she will change down again, high revs and the car seems confused as to what gear she wants to be in. I ease off, then accelerate again and will change into 4th. It's almost if there is a sensor that detects gradient that is messing things up ?

I think there is a good chance the intercooler hoses are sucking in or are delaminating. There is bloke in the D2 section who wants one hose out of a kit, which is the opposite hoses to what you need. Perhaps between the 2 of you a deal could be struck to replace the hoses with silicon aftermarket hoses. Does it blow any smoke out the back at 3,000 RPM? If so it would support my theory.

TD5 Air Filter Box to Turbocharger Inlet Pipe

Thanks Jazzman, what exactly does this mean, do the pipes collapse under pressure?

Apologies for the delay, I have been overseas past couple of weeks ?

Originally Posted by surfingooner

Thanks Jazzman, what exactly does this mean, do the pipes collapse under pressure?

Apologies for the delay, I have been overseas past couple of weeks ?

Correct, effectively choking the engine.

Originally Posted by loanrangie

Correct, effectively choking the engine.

I have now replaced all the turbo / intercooler hoses with silicon ones, sadly still no change, when I bought them, they suggested the injector seals or the injector wiring loom. They also suggested I book it in to the local Bosch specialist next door to try and find the fault. I have spent so much time trying to get to the bottom of this but bugger me what could it be.....

generally the car is running well, have the boost set right and going quicker than ever, but still all goes to pot when I get to the inclines.

A thing to be ruled out is to make sure that all the injector codes are well saved in the ECU memory, a classic symptom of not coded injectors is that the engine can't rev above 3000 so if you take off the cover write down the codes then use tester and compare with what's saved in the ECU maybe the previous owner messed up things there or even if an injector is refurb'd it must come with a new code which has to be saved in the ECU... this is stated in the book too but i've tryed myself when i fitted other ECU and it didnt rev above 2800rpm before i saved the codes, otherwise it ran well.... taking into account all you've already done IMO better rule this out too