Spark Plugs

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mgthe3

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Joined Mar 2, 2004

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#21 · Jul 5, 2005

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it sounds as if you got the wrong heat range---how a plug with 4 seperate electrodes could misfire could only be due to nasty cylinder conditions or wrong heat range for the plug's self cleaning properties. NGK U-grooves are legendary for 2 cycle engines--they tend to foul plugs easily.
If in the correct heat range, 4 electrodes are better than one.

 

Kris

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Joined Jul 23, 2003

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#22 · Jul 5, 2005

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I tend to agree with improper heat range. Had it happen before in a motorcycle. And quite recently in a lown mower!

It would be interesting to see what Bosh has to say about their plugs and Murano engine.........

 

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Tyler_Canada

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Discussion starter · #23 · Jul 5, 2005

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I agree it sounds like the wrong heat range, but they were the ones listed by Bosch for the vehicle. It could have been the spark orientation in the cylinder though. Instead of firing "up/down" the +4s fire "sideways" (relative to the plug lengthwise of course). The engine was in mint condition, there were no problems there.

I must say, I'm extremely happy with the stock plugs, I see no reason at all to change. And while relatively expensive, they're still only about half the cost of the +4s.

 

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Tyler_Canada

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Discussion starter · #24 · Jul 5, 2005

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Bosch doesn't list an application for the Murano.

 

Eric L.

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Joined Aug 11, 2003

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#25 · Jul 5, 2005

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I hope we all know by now that how much something costs is not necessarily reflective of how well it will perform.

I'm sure the Bosch plugs are acceptable substitutes. However, the stock NGK Platinums are excellent plugs and I've never seen one "foul" in a well maintained VQ.

 

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GMTURBO43

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Joined Jul 25, 2003

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778 Posts

#26 · Jul 5, 2005

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Has anyone used the NGK Iridium plugs in a VQ engine?

 

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zagato27

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Joined Jul 15, 2005

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#27 · Jul 15, 2005

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My .02. I remember when I was ready to change the plugs in my 97 Max I did a bit of research on the forums. The concensus was to stay away from the Bosch +4s and stick with the NGK Plats. I read a bit more and finally settled on the NGK Iridiums for the Max. No problems. Just changed out the plugs in my daughter's 92 Acura Legend LS Cpe with NGK Iridiums and again very happy. I think you can't go wrong with NGKs. Cheers