Question about 2006 Volvo S40

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Its an R plate S40 TD with 156000 on the clock. When the engine is idleing their is blue smoke comeing from the exhaust and also if the revs drop below 2000rpm when driving their is a lack of power and blue smoke. The only way to stop the blue smoke is to get the turbo to kick in! Friends have told me that it is a fueling issue and i have already changed the fuel filter but with no joy. It also struggles to start up when cold and is prone to stalling when stopping until the engine has warmed up. I regularly check the oil level incase it was oil but the level has not moved in the 2 months i have owned the car!

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  • Anonymous Mar 31, 2014

    when starting the car which is diesel there is a lot of light blue smoke coming out of the exhaust. there is only what I can call a detergent like smell in the cab when starting the engine, Any ideas??

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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

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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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===
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