11-11-2009, 10:23 AM
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#7 (permalink)
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Quote:
Originally Posted by 370Zsteve
"Cheap gas" will not be any different from "name brand"gas except for the munufacterer's additives, which are such a small percentage of the fuel as to make no difference at all in combustion. The raw distillate all comes from the same place, refinery. The only thing that will cause a ping id the octane level. A 91 octane from a Sunoco, an Exxon, or a Global is still a 91 octane.
You should hear a loud ping when either running at very low RPM under load try running in 5th gear at a low RPM and giving it some gas. Or run it up a hill, again in 5th gear at low rpm, you should also hear a loud ping.
If the engine really is pinging, take it to another dealer for a check. Wow, it sucks not being able to get 93 octane where you live! Yet this engine should run normally on 91 octane, says so in the manual.
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I agree with Steve, on the probable cause, the octane your putting is within spec of nissan's requirements, I would suspect a bad o2 sensor is keeping it to lean, the Dealer has to dig into it and find your problem, his suggestion of Oh well just add some additive, and will see what happens is Bull Shit, a new car shouldn't be pinging, that's just Embarrassing, If he won't do nothing about it find another dealer like it's been suggested. 
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