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sven_eis1

Volvo S40 diesel engine stalls at idle

I'm experiencing a frustrating issue with my 2008 Volvo S40 diesel with 117155 km. The check engine light illuminated recently, and now the engine stalls intermittently at idle. I've also noticed a significant reduction in engine power, especially when accelerating. After running diagnostics, I suspect a defective fuel volume regulator, possibly stemming from a failing high-pressure pump. Has anyone encountered similar fuel injection problems on this engine? Any insights would be appreciated before I dive deeper.

Summary of the thread

A 2008 Volvo S40 diesel is experiencing stalling at idle and reduced engine power, with the check engine light on. The suspected cause is a defective fuel volume regulator, potentially due to a failing high-pressure pump. A similar issue in another diesel vehicle was resolved by checking the fuel pressure sensor readings using an OBD reader. Ultimately, the problem was confirmed to be the fuel volume regulator and high-pressure pump, which were replaced to restore proper engine function.

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4 comment(s)

alexanderbraun45

Sounds familiar. I had a similar experience with my old Renault Megane diesel. Check engine light, stalling, and power loss – all point to fuel delivery issues. In my case, it ended up being a faulty fuel pressure sensor. It wasn't the pump itself, but it was throwing off the fuel mixture. Have you checked the sensor readings?

sven_eis1 (community.author)

Thanks for the quick reply. I appreciate the Renault insight! When you mention the sensor readings, do you mean using an OBD reader to monitor the live data stream from the fuel pressure sensor? Or is there another method you'd recommend? I'm trying to get a better handle on this before potentially replacing the high-pressure pump.

alexanderbraun45

Yes, I mean using an OBD reader to monitor the fuel pressure sensor's live data. See if the readings are erratic or out of the specified range. While my issue was 'just' the sensor, those symptoms definitely suggest a deeper fuel system problem. Honestly, given the potential complexity and high pressures involved, I'd strongly advise getting it checked by a workshop with experience in diesel fuel injection systems. Could save you a lot of time and potential damage.

sven_eis1 (community.author)

Thanks, that's solid advice. I appreciate you sharing your experience with the Renault. I've taken your advice and had it checked by a workshop. Turns out my initial diagnosis was correct: fuel volume regulator was indeed defective, caused by a failing high pressure pump. Repair cost me 1510€, but at least it's running smoothly again.

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VOLVO

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S40