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Please help: G35 p0300 problem

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Old 04-24-2010, 02:53 PM
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I haven't been pleased with either of the two dealers I have been to so I'm with you on that boat. I would say bring the car back in and have them diagnose it again. If they charge you for the diagnosis, that's B/S considering they already diagnosed it and were wrong the first time. The least they can do at this point is diagnose it again for free. See what that say. Do the basics by checking the spark plug first, though.
Old 04-24-2010, 03:00 PM
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im also beginning to wonder if it could be a fueling issue
Old 04-24-2010, 03:13 PM
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I suppose it could be, but if you can see black smoke and smell unburnt fuel then clearly the injector is working as it should. Just sounds like it's not sparking when the cylinder is in the correct position or not firing at all.
Old 04-24-2010, 03:28 PM
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that was my thought which leads me to another question....timing?
Old 04-24-2010, 03:39 PM
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Would cause a misfire on more than just cylinder 6, and timing is all computer controlled on the G anyway. You really can't throw off timing unless your timing chain is off by a tooth in which case your car would barely run, if at all. At least as far as I know. I would say to look at the wires but the car was running with the new stuff and then messed up again. The only thing I can think of that could cause that kind if problem is if your new plug is already fouled. Again, if there was oil in the tube that fouled your previous plug, it could theoretically foul this one.

Not much else I can recommend until you pull that plug. Seems to be the most likely problem.
Old 04-25-2010, 01:41 AM
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pulled all plugs on drivers side head checked gap replaced number six plug car still misfires............have a noice coming from catalytic converters also
Old 04-25-2010, 04:40 PM
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If your cats are blocked they can generate excess heat and cause a misfire but it shouldn't be limited to cylinder 6. It should be more random than that. If you have black smoke and unburnt fuel I suppose it's possible that you have an injector that is stuck open.
Old 04-25-2010, 07:12 PM
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the more you respond the more places i have to look i really appreciate the help and the fact that your so willing to help somebody that you've never met.....its not that im a cor novice but im out of my element with nissans like i said before if this were a 1.8t engine itd be long fixed
Old 04-26-2010, 01:05 AM
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I appreciate the kind words. We're all here to help. Diagnosing and attempting to fix your issue is a way for both of us to learn more as well.

With that said, to diagnose your injectors the only thing you can do is pull off your upper and lower plenum and manifold until you get to the fuel rail and injectors. With that off, have someone get in the car and turn the key to the "ON" position. The fuel pump should prime the fuel system. If you see any spray coming from any of the injectors, you'll need to replace that injector. Unless someone else has another way to test.

Last edited by Bauer418; 04-26-2010 at 02:00 AM.
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Old 04-26-2010, 11:11 AM
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the dealer is saying they want to change the intake gaskets where the intake goes to the head(no charge) bc they think a possible leak.....doubt it......but i will tell them to check this while theyre down there nhopefully they listen and i dont have to do this myself like everything else
Old 04-26-2010, 12:34 PM
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well now said dealer doesn't want car back i will contact warranty company and see where else to send the car
Old 08-24-2010, 06:41 PM
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what is the end result of this thread? i am going through the same BS
Old 03-03-2011, 11:20 PM
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What was the end result i got a car that wont start now
Old 03-04-2011, 12:33 AM
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check the resistance on the injector. and i assume you're getting spark?
Old 03-05-2011, 03:23 AM
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it started multiple times but major smoke is coming out the magnaflow.{for a 335i}

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2005, air, code, computer, coupe, engine, flow, g35, gasket, issue, leak, mass, misfire, misfiring, p0300, plenum, sensor, smoke
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