Hey guys,
Just wondering if anyone could offer any insight into my issue. I have a 2006 hilux (with egr cooler). The car now has 195xxx klms on it. The previous engine died at around 180xxx and I have replaced it with a 2008 model engine but used my existing turbo did all the work with me and a mate. Since installing the engine I have noticed a slight whine coming from the turbo at around 5 psi ( in cab boost gauge) and when this noise can be heard 50% of the time the boost will fluctuate from 5-10 psi it goes up and down about 5 times without me moving my foot on the throttle. It does it when cold or hot high speed or low speed. It seems to be triggered by a sudden increase of boost. The car has no engine codes and no boost leaks from what I can see. We noticed a small leak on the intake manifold a little while back but have now resealed that and is no longer leaking however boost fluctuations are still there. I am aware that these are a variable vein turbo and I know that the computer controls the boost I have replaced my stepper motor on my turbo but issue still remains. I believe something is telling the turbo to go up and down the boost but where it is getting this signal I cannot figure out.
Cheers blokes, frostyy.