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Matt, Engineer
Category: Car
Satisfied Customers: 20360
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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Vauxhall Astra Van cdti: Hi I just went through a deep puddle

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Hi I just went through a deep puddle in my van and now it has no turbo boost. I didn't drive through the puddle fast, just crept through. The van still runs and starts fine but the turbo is not there and It has a bad oil leak.

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.

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
Also have a feel around with your bare hands with the engine running to see if you can feel any escaping gas under your touch. Another method is to use a soap and water solution sprayed onto any suspect areas - if there's a leak it'll bubble up with the engine running

Also check that the vacuum hose running to the dump / turbo bypass valve is intact with no leaks as if the dump valve is opening prematurely you'll be losing all your boost

If this is OK then remove the high pressure intake hose after the turbo and have a feel of the turbine wheel - there should be no play radially at all - but a little bit of axial / end to end float is normal
Customer: replied 3 years ago.
Because of the oil leak, could this mean the seals on the engine have gone. If so can this be fixed?
Hello Richard

Have a check inside the intake just after the turbo for any signs of oil as this would be an indication that the turbo oil seal is starting to fail and a replacement / rebuilt turbo may well be required.
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