Turbo’s

[Keith]

Anyone have any experience with turbo’s?

I know how they work but i’m have a big lack of power issue when my 04 Volvo S40 is cold. It feels like the turbo isn’t engaging/spinning when it’s cold but seems to work normal when warmed up. I know their is a boost pressure solenoid and a waste gate, but i’m not sure which to check first. I might pull he turbo and see if the mechanical linkage is working on the waste gate.

Topic

[college man]

can you see the turbo spin? The waste gate may be
stuck open.good place to start.

[EricTheCarGuy]

Turbos work pretty much the same but different manufacturers control them differently. For that reason I’d recommend getting your hands on a factory service manual to see how to test the one you have. In addition, don’t rule out other performance issues like an engine that’s out of time or a restricted exhaust. Don’t assume because you’re down on power that it’s a turbo issue. There could be other things happening. Take your time and do a proper diagnosis not based on assumptions for the best outcome.

[Flemming Jacobsen]

If the exhaust pressure is down, then you will also most likely suffer bad turbo performance as it is the exhaust gasses that is effectively driving the turbo etc.

[Author]

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