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2026. 6. 30. 작업

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Mk5 golf lacking boost and smoke before turbo

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Your Golf's turbo has a solenoid operated control to vary its geometry. I remember it as part N75. If this is in any way faulty you will have most of the symptoms you are describing. A hand-held vacuum pump to the turbo's vacuum supply hose will allow you to see the turbo vanes operating correctly. Follow the vacuum hose from the turbo back to the solenoid to find the solenoid. (Taking out the EGR valve will increase your NOX emissions and is not a good, or legal, idea. The straight through exhaust doesn't count a lot either way apart from a possible increase in noise.) The colour of the smoke is important. Black is not enough air or too much fuel. If the smoke is more blue then black, it means that oil is being burnt. When the turbo goes on an engine it is normal for the exhaust to 'fill' with oil. Your smoke may be due to a lot of this, and the other symptoms could be accounted for by heavy oil saturation of the catalyst convertor and exhaust system choking off the engine. A last con