Question about 2006 Volvo S40
It is possible that your fuel regulator is leaking.
On the throttle assembly, there should be a few vacuum hoses attached. Pull those off and shake it a bit to see if there is any fuel coming out of it.
If it is...there should be an updated fuel pressure regulator.
Also you should replace the Idle Air Control Valve which is located near the front to bottom side of the throttle assembly.
When the fuel pressure regulator leaks, it causes a rich mixture and also damages the Idle Air Control Valve.
Both of which I have seen cause a hard start, lack of power, and blue smoke.
One more thing to look into are a set of coils, wires and plugs.
I've seen the coils get hairline cracks which causes the electricity to fire the spark plugs to arc out and not fire off the plugs efficiently, which ultimately causes lack of power and blue smoke.
Posted on Nov 10, 2008
Sounds like the fuel mixture is way off (gas to air ratio being fed to the engine). The mixture is probably way too rich (too much gas). I'm sorry I don't know much about Volvos, this could be a sensor that has failed and is causing the wrong fuel mixture, or an adjustment of a metering screw. So, yes, I agree it's a fueling issue, sorry I can't provide more info. countrycurt0
Posted on Aug 04, 2008
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