Hi,
Can somebody tell me how to replace spark plugs on a g35. I know I have to take off the engine cover, find the correct wrench, etc but is there a detailed DIY guide somebody over here has?

Thanks for any help I can get here

The stock plugs are rated to last a long time (forget the exact mileage #), so I doubt you need to change them.

agree, why are you changing them?

how many miles befor u change them on a 07 let me know plz i got 63k

I changed mine @ 88k because i was misfiring in cylinder 6, and that plug was just awful when i pulled it out, word of advice, get your plugs FROM the DEALER, tell them another dealer quoted you 12 dollars a plug, you'll get the price i'm sure. or if you want to be safe, i paid 12.50 for mine, one thing i encountered was after i did my plug install my ecu had tripped out, and that whole ordeal costed me 145 bucks @ infiniti to reset my ecu ;[ but other than that, the install is VERY easy intakes are easy to take off, just make sure you don't unplug any sensors especially to the throttle body.

Thanks guy for the advice. Just to answer the queries:
1] Infiniti recommends spark plug replacement at 50k miles (in my region at least)
2] eticket and Austin Are correct, the plugs do last a long while. To be honest a friend got me a set of Bosch fusions which are working a bit better than the stock densos in his g37 '08. Though I'm not missing any sparks but theoretically the extra spark your plug produces does help. This is purely an experiment.

42N81 thanks for the words on the ecu issue; will keep that in mind.
Thanks again guys. Happy driving!

Thanks guys for the advice. Just to answer the queries:
1] Infiniti recommends spark plug replacement at 50k miles (in my region at least)
2] eticket and Austin Are correct, the plugs do last a long while. To be honest a friend got me a set of Bosch fusions which are working a bit better than the stock densos in his g37 '08. Though I'm not missing any sparks but theoretically the extra spark your plug produces does help. This is purely an experiment.

42N81 thanks for the words on the ecu issue; will keep that in mind.
Thanks again guys. Happy driving![/QUOTE]

So when ever I got to change my spark plugs in going to have trouble with my ecu?

You paid $145 to have your ECU reset?
Holy crap... that's complete highway robbery.

I'm also looking to change plugs on an 08 G35 sedan rwd.Does plenum need to be removed completely?

I'm going to do mine in the next week or so while I have my upper plenum off. However, it is not required to remove the plenum at all. I think I paid maybe $40 for upgraded Iridium X plugs in oem heat range at Rockauto.com. Here's what I'd go by in addition to a Haynes manual I have laying around:

You do realize this the V36 section . . . right?

I hate to plug another forum, but the best DIY I found for the 07-08 G35 Sedan spark plug change...

http://forums.nicoclub.com/how-to-ch...7-t466365.html

Plan on doing this tomorrow.

Is TB removal necessary?

also off subject, is that coolant running to the TB? In AZ I don't have to worry about frozen condensation.
Seems like an opportunity for a cheap mod.

Not to nitpick, but IMHO there's two concerns with that DIY that anyone following it should consider. First, there is no need to use anti-seize upon the initial installation of a new set of plugs. The plugs for our car should be factory coated with a special plating that takes care of seizing concerns and avoids the over-torquing scenario that can easily occur with he added lubrication of anti-seize. Second, when using Iridium plugs, those wedge type feeler gauge wheels are especially dangerous if you're not extremely careful to avoid ANY prying on the electrode's tip. . The super fine tips on the iridium plugs are very brittle and therefore quite fragile and prone to breaking and/or, even worse yet, fracturing and breaking later inside the cylinder.

Some references:

http://www.ngkplugpro.ca/content/con...SparkPlugs.pdf

http://www.ngksparkplugs.com/pdf/dyk_5points.pdf

http://www.densoiridium.com/installationguide.php

http://www.ngk.com/glossary.asp?kw=P...ng&manID=1&pt=