now a diesel head..
AO Silver Member
Join Date: Sep 2014
Location: United Kingdom
its most likely VNT related , you have ruled out everything else, either the vanes are sticking or they are not being actuated either because the vac hose is leaking or the solenoid switch is faulty..
the only other things can be MAF or MAP sensor or even a lambda fault but I doubt its this, physics 101, combustion is air and fuel at as close to a stoichiometric ratio as possible, the fuel injected is designed to ensure the correct ratio is achieved based on what the ecu thinks the turbo will provide at any set RPM....as you are getting unburnt fuel (smoke) either the fueling is too high (unlikely) or the air provided by the turbo is insufficient to ensure a complete burn, where a forced induction is concerned the turbo and its correct operation is the obvious place to look if all the other usual suspects have been ruled out.
so if you are 100% sure MAF and MAP sensors are operating as they should be then the next place to look in order of ease and expense, is the vac hoses, then solenoid switch and then finally the turbo itself.
P.S get rid of the EGR and have it mapped out..it causes nothing but trouble.
best of luck with it..
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