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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22736
Experience:  BEng hons Mech engineering, in auto industry 22 years
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why dooes my C4 VTR+ floods even though I never touch the acceorator

Customer Question

why dooes my C4 VTR+ floods even though I never touch the acceorator pedal
Submitted: 4 years ago.
Category: Car
Expert:  Matt replied 4 years ago.

can you tell me what engine size and fuel type this is please ?

also when you say it floods - does the engine start and run Ok and then just die ?

or do you have a problem on hot restart?

Customer: replied 4 years ago.

bmw 1.6 Petrol engine On starting from the engine turns a few times,

but does not start ( it does not run smoothly and dies afterabout 3 seconds.

On the rare ocasions it does start bblue smoke and the strong smell of fuel.

I have taken it back to the dealer ( A main agent for Citroen.

This car is a citroen with a BMWYour answer please

Expert:  Matt replied 4 years ago.

If you're getting blue smoke this would indicate that you're burnign oil

if there's a lot of oil present then the engine will run poorly as the spark plug will be coked up

I'd suggest pulling the spark plugs and inspecting them for oil and if its there then the first thing I'd check is the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet , however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carrys oil over with it.

If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil.

If you do find oil replace the valve. If this is all OK then its possible that the valve stem seals are past their best and are drip-feeding oil into the intake. These can be replaced without removing the head by a competent garage in half a day or so

Also 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. 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