Presage engine power loss and smoke

Hi, I've got a 2000 Nissan Presage with a gasoline engine that's giving me some grief. The check engine light is on, and I've noticed a definite reduction in engine power. Also, I'm seeing some smoke when I accelerate, which is new. I suspect it might be a crankcase ventilation valve issue. Anyone had similar problems?

4 comment(s)

That combination of symptoms does point towards a crankcase ventilation problem. Have you checked for any obvious vacuum leaks or unusual noises coming from the engine? High oil consumption could also be related.

Thanks for the quick reply! I haven't noticed any obvious leaks, and the engine sounds normal apart from the power loss. Oil consumption seems normal too. Is there any way to be 100% sure it's the valve before I start replacing parts?

Without proper diagnostic tools, it's difficult to be completely sure. However, given the symptoms, the crankcase ventilation valve is a prime suspect. A faulty valve can cause the engine to run lean, leading to smoke and power loss. If you are in doubt, take it to a workshop. I estimate the repair cost at around 360€.

Okay, thanks for confirming my suspicions. I'll take it to a mechanic to get it properly diagnosed and fixed. I appreciate the help!

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