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Matt
Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 21617
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 2005 2,5 a4 the car at times wont start and when it

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i have a 2005 2,5 a4 the car at times wont start and when it does its in limp mode with lots of white exhaust fumes slowly bringing the revs up it goes back to normal
Submitted: 12 months ago.
Category: Audi
Expert:  Shantal-Mod replied 12 months ago.
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Customer: replied 12 months ago.
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Expert:  Matt replied 12 months ago.

Hello

I'm assuming that this is the turbo diesel

so

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.

Expert:  Matt replied 11 months ago.

Hi

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Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 21617
Experience: BEng hons Mech engineering, in auto industry 22 years
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