got the code po300 (cylinder misfiring)
Engine doesnt turn on easily and the engine would shake like crazy for a few seconds after it turns on.

I have 150k miles and never replaced the spark plugs yet, do you guys think the spark plugs could cause this problem?.

Need to find oem spark plugs.
Ngk# "Plfr4A-11" is the OEM spark plugs for 05 g35x? cant find the exact answer.

Called the dealership for the plugs and they are asking for 16$ each.
Anybody know any good sites i could buy these plugs at, other than infinitipartsusa.com?
thanks

 

ur manual will say which plugs to get. once u get the right parts number amazon and ebay is ur best bet.

 

Damn it.!!
I just replaced the spark plugs on my g35x 2005.

I found alot of oil on two spark plugs and the tube, one on the furthest front of the driver side, and one on the passenger side far end. Dont know which cylinders they are.

Why is it leaking oil? how much is this fix?

also my car still takes time to start. I thought changing the spark plugs would do the trick. what could the problem be?

 

The reason that you have oil on two of your spark plugs is because your valve covers are shot.

 

Your valve covers are shot. Find a mechanic who knows infiniti's and get it fixed. The part runs $150-250 each and there are 2, then whatever labor is. 4 hours wouldn't be unreasonable. I'm sure you also need an oil change or something as well after 150K miles... there are things called maintenance my friend, you really need to do them

 

damn..
what causes the valve cover to leak oil?
is there a diy for valve covers? couldnt find one.

 

the rubber seals jus get old too quick and doesnt seal anymore

 

so can i just buy a rubber seal and replace it?
or would i need to buy the whole valve cover to replace?

 

search brah. this is nothing new and the car didnt just come out so theres tons of info about this