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VW Jetta 5 1.9 TDI: I drive VW Jetta 5 1.9 TDI 2006. The turbo

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I drive VW Jetta 5...
I drive VW Jetta 5 1.9 TDI 2006. The turbo boost cuts out at 2400 rpm and with it lets out a white greyish smoke when idling and and when you drive of, it smells only of diesel with no oil smell included. The engine, head and turbo was done over. The mechanic's prognoses is that there is some wrong with the throttle body and egr. what can be wrong
Submitted: 1 year ago.Category: UK Car
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5/5/2016
UK Auto Mechanic: Matt, Mechanical Engineer replied 1 year ago
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 22,161
Experience: BEng hons Mech engineering, in auto industry 22 years
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Hello I'd first check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it. If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve
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UK Auto Mechanic: Matt, Mechanical Engineer replied 1 year ago
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