P0300 random misfire code HELP!

6MT · 04-28-2011, 02:58 PM

Quote:

Originally Posted by ChrisSlicks

It is possible the AF ratios are a little bit out of whack. I've seen this happen a couple of times even on stock cars.

But first make sure you're using good quality gas, the 370Z is pretty picky and throws a tizzy if you give it the cheap stuff.

Alchemy · 04-28-2011, 04:55 PM

Quote:

Originally Posted by 6MT

Well hopefully thats it. What really confuses me is the fact that it was on for so long then went off. I was almost on empty when I gassed it up yesterday and the light went off today which makes it seem like it could be a fuel issue. But, I filled it up plenty of times when the light was on last fall and it never went off then.

ChrisSlicks · 04-28-2011, 05:00 PM

Quote:

Originally Posted by Alchemy

Well hopefully thats it. What really confuses me is the fact that it was on for so long then went off. I was almost on empty when I gassed it up yesterday and the light went off today which makes it seem like it could be a fuel issue. But, I filled it up plenty of times when the light was on last fall and it never went off then.

The light goes off when it hasn't seen a misfire for a given number of cycles and time. If they continue to occur sporadically then the code stays active.

It can also be caused by the primary O2 sensors giving bad feedback data, but this mainly occurs in high mileage vehicles.

Alchemy · 04-28-2011, 05:58 PM

Quote:

Originally Posted by ChrisSlicks

The light goes off when it hasn't seen a misfire for a given number of cycles and time. If they continue to occur sporadically then the code stays active.

It can also be caused by the primary O2 sensors giving bad feedback data, but this mainly occurs in high mileage vehicles.

I was wondering yesterday about the cycles. How long does it take to run completely through a cycle on a 370? Btw thanks for the help rep^.

ChrisSlicks · 04-28-2011, 07:54 PM

Quote:

Originally Posted by Alchemy

I was wondering yesterday about the cycles. How long does it take to run completely through a cycle on a 370? Btw thanks for the help rep^.

I'm not sure of their exact formula, but they usually stick for about 3-4 starts and/or 30-50 miles.

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