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XC90 Diesel Engine Power Loss and Smoke

I am writing to inquire about a potential issue with my 2004 Volvo XC90 diesel. Recently, the check engine light illuminated, accompanied by a noticeable reduction in engine power and smoke emission upon acceleration. The vehicle's mileage is currently at 52457 km. Could this be related to a crankcase ventilation valve malfunction, given the symptoms? I would appreciate any insights.

A 2004 Volvo XC90 diesel is experiencing engine power loss and smoke emission, with the check engine light on. These symptoms may be linked to a malfunctioning crankcase ventilation valve. A rough idle further suggests this issue, which, if not addressed, could lead to severe engine damage. Immediate inspection and repair by a qualified mechanic are recommended to prevent further complications.

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4 comment(s)

Hey, those symptoms do sound worrying! A faulty crankcase ventilation valve can cause all sorts of issues. Have you noticed any unusual idle? Maybe a whistling sound or a rough running engine at a standstill? Also, have you checked for any obvious signs of oil leaks around the engine?

Thank you for your reply. Regarding your questions, the idle does seem slightly rougher than usual, although there is no whistling sound. I have not yet thoroughly inspected for oil leaks. If it is indeed the crankcase ventilation valve, how critical is its immediate replacement? What could happen if I delay the maintenance?

If the idle is rough, and you're seeing smoke, driving with a bad crankcase valve can lead to serious engine damage over time. Think blown seals, oil leaks everywhere, and potentially a seized engine. It's best to get it checked by a workshop ASAP. They can confirm the issue and give you a proper quote for repair.

I appreciate the advice. Based on the information provided, I will schedule an appointment with a qualified mechanic to assess the crankcase ventilation system. I had it diagnosed, and the crankcase ventilation was indeed defective, and the eventual repair cost amounted to 360€. Thank you again for your assistance.

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VOLVO

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XC90