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Originally Posted by MightyBobo Cyl 5 misfire huh...what kind of gas are you using? 91 at least? Maryland too, I see. What dealership? Just seeing if its Tischer in case
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#3 (permalink) |
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I have been running royal purple for the past 6 months, with no issues..But i have read reviews about RP not being good for VQ engines.. then again i also read that aliens landed on Roswell.
Could be bad fuel deposits on that one injector, or a bad park plug all, normal things.
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#5 (permalink) |
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I had a SES light come up a few months back. The tech had to talk to someone at the factory because he couldn't figure out why it was a code for a misfire. My car is a manual w/ sport package and no mods (just AMSOIL). He said only one other 370 has come in with this misfire and from what we could figure it was from tagging the rev limiter. It made sense because I do stretch her out from time to time. One thing I remember was that the idle settled @1,000 rpm with the SES light on and went back to its normal 650 rpm idle after the code was cleared. I've put about 1,500 miles on the car since the code was cleared and have been trying to shift right when I see the light come on. So far so good. I don't think Royal Purple would hurt your engines' top end, but if you want a synthetic with esters AMSOIL and Redline might be worth a look. BTW I have @ 11,000 miles on my Z.
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#6 (permalink) |
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I have had the SES light come on four times since i got the car in Nov. The first was at 80 miles on the odometer, random misfire (P0300), and i just had it cleared thinking it was a fluke. The second time (80 miles later) took it into the dealer, they dismissed it saying it was working the "kinks" out of the system or something. Didnt really believe it, but thought maybe some fresh gas (the tank was full when i test drove it) would help. It was about 1500 miles later and came on again, the dealer did an idle air relearn procedure. Then about 400 miles later it came back on. This time they kept it for two days, and working with Nissan Tech support they replaced both MAF sensors. They had noted that it had been running rich, and this had taken care of that, and I believe that will actually solve the issue.
Everytime the light came on as a random misfire (P0300) and it was after the car had sat overnight or all day will I was at work (8+ hours) and came on during the initial startup. Only time will tell if this really takes care of it, I have about 400 miles on the car since the MAF sensors were replaced, but I feel more confident since they actually replaced something rather than just resetting the ECU, and that it took care of the running rich condition as well. I dont know if something like that could trigger a specific cylinder misfire, although if it is related to the MAF sensors, they intakes would be a very easy scapegoat. |
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#7 (permalink) |
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***UPDATE****
Just talked to the tech again They are saying the oil and Carbon deposits on the throttle body are causing the P0305 SES light. They want to do a fuel service cleaning, don't think I am saying it right but they say that it is done about every 15000 miles. Is this true and should I get it done. They also want to replace the passenger side cabin filter and do the flush but its expensive like 175... Is it worth it? |
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#8 (permalink) | |
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All Nissan dealerships LOVE warranty work. There is nothing in the service manual that states that one needs a fuel service cleaning every 15K. The throttle body has nothing to do with a misfiring cylinder. |
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#9 (permalink) | |
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Semi-off topic but I thought I'd throw it out there. For maintenance, or to correct MAF deposits from an over oiled (oil based) filter (like what they may use on aftermarket intakes) there is this stuff:
CRC Mass Air Flow Sensor Cleaner: ![]() Quote:
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#10 (permalink) | |
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I used the MAF cleaner all the time on my turbo car as they do get some coating on the MAF sensor wire itself and that stuff cleans it good.
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#11 (permalink) |
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The chemicals in most cleaners can seep into the oil and given that it breaks down oil deposits and such it can do the same to the oil. Many recommend that if used, it should be used a couple of tanks of gas before you drop the oil. Can not say if they are right or wrong but seems worth running a couple of tanks of gas just to be sure that any "add to the gas" solvents are out of the tank. Obviously, if the engine is tight then there is less chance of the solvent getting into the oil...
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#12 (permalink) | |
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