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Discussion Starter · #1 ·
Once in a while I'm getting misfire codes. It's always p0300 p0301 and p0303.
It never happens if I let fuel pump to prime the system for a few seconds so
I suspect it's fuel related.
2006 S60R 46000 miles

thanks
 

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Have the plugs been changed? PO301 means cylinder 1 misfire. So I would check the plugs and coil pack. You should change both at your mileage though.
 

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Discussion Starter · #3 ·
I don't have any maintenance records but I doubt anything had been done to this car (bought it last may). I have a set of plugs and will replace them
soon but i don't want so spend $250 on as et of coils if it's not completely necessary. I'm still suspecting something fuel related like dirty filter or something but
wanted to get some feedback first.
 

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Get a cheap fuel pressure gauge (or a good one. Harbor freight has usable one for $15 range) and put it on fuel rail valve and see if you hold at least 200 kPa/29 psi through 20 minutes since shut down. I'm betting you're right and your fuel press is gone in a few minutes. With the fuel pump priming runs stopping the issue you are likely right that coils and even plugs would be a waste of time.
 
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