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Old 02-17-2014, 07:43 PM   #1
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2005 Volvo xc 90 T6


I recently scanned a code on the car and it showed P0300. Misfire emission level from at least 1 cylinder with three-way catalyst damage from at least 1 cylinder.

I changed the spark plugs with OEM plugs. I do not wish to change all 6 coils unless necessary.

What does this code mean and what is possibly wrong with my car??
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Old 02-17-2014, 08:55 PM   #2
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2005 Volvo xc 90 T6


Po300 is a random misfire at start up. Could be just worn plugs. Could be fuel bleeding down and low at initial start up... Many things with new plugs clear codes and see if it acts up again
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Old 02-17-2014, 10:57 PM   #3
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2005 Volvo xc 90 T6


Quote:
Originally Posted by cjm94
Po300 is a random misfire at start up. Could be just worn plugs. Could be fuel bleeding down and low at initial start up... Many things with new plugs clear codes and see if it acts up again
Have cleared code. It acted up again and code came back.
What next??
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Old 02-17-2014, 10:59 PM   #4
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2005 Volvo xc 90 T6


P0300 is a random miss fire fault code. That can be caused by a lot things, do you have access to the scanner?
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Old 02-17-2014, 11:01 PM   #5
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2005 Volvo xc 90 T6


When you say acted up what do you mean?
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Old 02-18-2014, 01:25 AM   #6
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2005 Volvo xc 90 T6


A random misfire means the misfire is not lasting long enough to pinpoint which cyl. Meaning it could be just one cyl or multiple cyls. You are going to need a higher end scan tool that can monitor live misfire data and fuel trim data to find this problem. Not a real DIY diagnosis without knowing how to interpret the data it can lead to a lot of parts getting guessed at. Most higher end shops should be able to find the problem within an hours diag time. If it is real intermittent though it could take longer. If it's not acting up sensors will read correctly, but a good tech can interpret learned fuel trim values to lead them closer to the problem area.
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Old 02-18-2014, 04:50 AM   #7
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2005 Volvo xc 90 T6


Ok.
Thank you for the information.
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Old 02-20-2014, 05:05 AM   #8
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2005 Volvo xc 90 T6


Changed coil on cylinder #5 and cleared the code.
Car is running fine.
Thanks again to all.
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The Following 2 Users Say Thank You to mustang64 For This Useful Post:
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