The turbo was recently replaced and the exhaust is now running clean, but I suddenly have a loss of power around 3000 rpm, its similar to the miss fire of a spark plug but it is more sudden and conditioned than that and a larger loss of power like a cut off. I may also note that it seems faster while accelerating in the 0-20 mph range until that loss of power occurs, and this is with a very light press on the pedal. Any ideas?
Run the fault codes and look for a problem area in the vane actuator of the turbo
it could be a sensor problem or a MAP sensor problem
this is indicated by the pressures being generated or not generated by a turbo generating pressure from the throttle opening on acceleration or held at constant speed
Hey thanks for the quick response Bill! There is no check engine light, as of now. Would this be something that would illuminate the light? I'd also like to add that before i found your answer here I continued to look into forums and found a very similar description, with faults that may lie in these following terms. connections to n75 and Diverter Valve, and or a loose hose coming off the rear of the turbo. Any insight on these?
to start with --no engine light does not mean no recorded faults
many manufacturers reserve the engine light for major faults that are detrimental to engine or transmission and minor sensor faults are just recorded
the reference to diverter valve could be the vane actuator ( dump valve) and it is activated by a vacuum hose .The electrical connection here could be loose or have dirty connections inhibiting the correct operation of the unit
Why I am concerned in this area is that modern turbos have a system of vanes for the exhaust turbine wheel that can be varied to direct exhaust gas onto the turbine wheel blades
this action gives a quicker response from the turbo especially at low rpms
it is electronically controlled through a vacuum controlled actuator so if there is a problem in that area indicators such as what you describe will show up
I would also check items like turbo hose clamps for correct tension, splits in the inter-cooler system or other areas that will reduce the boost available
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