Misfire issue ? P0300 - Nissan 350Z Forum, Nissan 370Z Tech Forums
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post #1 of 3 (permalink) Old 03-03-2016, 02:44 PM Thread Starter
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Misfire issue ? P0300

So i developed a misfire a few days ago which came along with a knocking" noise coming from the rear of the engine bay which would only be noticeable at idle and when taking off (CEL with P0300). The knocking would occur for around 20 minutes of driving, then would disappear and come back after a good 20-30min.Went ahead and replaced the spark plugs and checked the coils in which I noticed small amounts of oil on the plugs and in the plug wells (bad gasket?). After putting everything back and turning it on, misfire became worse and now white smoke from the exhaust is coming out although car isn't burning or leaking coolant/oil. Could it be that I just need new coils along with the valve cover gasket or is it possibly something worse ? Just wanting to see if it's a simple fix before I take it to the shop

I'm new to Z's so any help or advice appreciated guys
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post #2 of 3 (permalink) Old 03-03-2016, 09:44 PM
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The P0300 code is not very helpful - it's just a random misfire
Need a more detailed scan to get better info

The white smoke would indicate water getting into the combustion chamber - blown head gasket

A compression test of all 6 cylinders may be revealing
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post #3 of 3 (permalink) Old 08-20-2016, 09:10 PM
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If your motor is throwing out white smoke then something is definitely getting into the combustion chamber that shouldn't be and like Martin Z I'm guessing that your head gasket has gone walkabout and I'm sure if you drove it for a long enough period of time you'd find that you'd be losing both oil and coolant. Get your compression tester out and see what the outcome is. Standard compression =185psi, 142psi is considered low and if good, all cylinders should be within 10% of each other.
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