Fully run in and going strong!
Join Date: Oct 2011
Chasing my tail with lots of faults
Hi All, its been a while! New job and a new house have kept me pretty busy for the past 6 months so not much free time. Lots of changes since i was last here!
Im having some problems with the truck and wondering if any of you lot had some ideas. Its a euro 3 2006 auto.
To take it from the begining, i serviced it 2 weeks ago. Drove it fine for a week, took it to work and back on a friday. Went home to pick up tools to head up the coast to work on the caravan and i could tell just driving out of the estate something wasnt right. Sure enough got on the motorway, put my foot down and barely any power, revving like hell to get to 60mph and wouldnt go any more, it deffinately had no boost. Took it back and took the car up instead. Started looking at it on Monday after work. Plugged it in and had a P0234 code. Thought i might have dislodged a vac hose whilst changing the oil filter, went though and checked them all, got some from Paul at HCR so changed over what i he had anyway, as well as a second hand boost control solenoid from Paul and no difference. No more fault codes and no smoke at all, whilst still ticking over perfectly.
I put a vac hose direct from where it crosses the engine onto the turbo actuator and had a very sluggish take off then it would hit boost and shoot off. So i knew i had a turbo control fault, but i thought there might be something else wrong too due to the lack of power lower in the rev range. I picked up another second hand boost control solenoid today after testing both the first two as faulty going by the tests in the service manual. Bingo i suddenly have boost again, but its very similar to when i bypassed the boost solenoid. Very little power low down.
I thought this might not be turbo related as im below the boost range really. Watched the fuel rail pressure on live data and saw quite a lot of fluctuation, so got a new SCV from europarts and fitted that. Now got an even smoother tickover and a bit more power from stationary at junctions and the like, but something still isnt right.
I seem to have very little power until i hit 2500rpm, it suddenly flys off then dies back off again at 3000rpm. Once or twice when sitting right on 2700ish the turbo just dropped out and the truck started to decelerate, then after a few seconds back it came and it shot off again. When i got back i also had the P0234 code on again, which i haddnt got from numerous test drives with the second nackered boost control solenoid fitted.
So im now suspecting stuck vanes on the turbo, although the actuator arm seems to move freely with a pry bar through the wheel arch. And possibly still a vacuum leak that im missing somewhere. Although thought i might try swapping a Maf sensor over from a mates truck to see what happens there.
From my impression of how it works, the turbo is at max boost when there is barely any vacuum on it, and when the most vacuum is on it should be when its boosting at lower revs, so a weak vacuum could be a good start as to why i get a tonne of boost a bit higher in the rev range but not lower down.
Anyone else got any ideas? Always ran on Shell fuel and services every 6k miles. Genuine oil filter and mann fuel filter every time.