Guys what kind of spark plugs do i need for my automatic 98 Maxima 130K?

 

NGK v-power copper or NGK laser platinums.

This has been covered hundreds, no make that thousands, of times before. Please read the stickes at the top of the forum. You'll find all the commonly asked questions answered there.

 

If it's a 98 auto, I agree with nj ... ...

 

How do we know if you need spark plugs in the first place? What kind do you presently have and when were they last changed?

 

http://forums.maxima.org/showthread.php?t=417104

 

the ngk's or densos are not that bad either

 

BOSCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!















And no i am not serious

 

Advanced Autoparts sold me some NGK Iridium BKR5EIX-11 (5464) for my '99 at $6.95 a pop. They were cheaper than the platinums, and they didn't have enough platinums in stock. I've read that the Iridiums are supposed to be better, but I don't always believe everything I read. I'm just looking for a decent OEM replacement with the same longevity. Any reason not to use these plugs? Or should I return them? And would the gap still be .044 for these plugs too?

If this has been covered before, I appologize. I'm new to this forum, and the search capability is disabled, which makes it hard to find information on these kinds of topics.

Thanks!

 

I Just Installed Some New Platinum Spark Plugs, And It Seems That They Are Misfireing. I Dont Know What To Do. I Am Going To Start A Thread.

 

Oh ya, well what brand are they...some K-tel--Ronco junk?

 

The timing gap is off, you need to check the crank angle sensor and when it's at .044", (with the electrode facing the ex valves) then it should work.

You can't start a thread yet.

 

I think I'm just going to put the Iridiums in. NGK says they'll work, and they have the .044 gap setting listed on their web site. $6.95 for a 60Kmi plug is a great price!

 

NGK coppers all the way

 

Idridium is good plug. You do not exactly need them, but they will do just fine. Gap on them should either be .040 or .044. You do gap those plugs because you will break the tip cause it is very small and thin. That was a great price for them the denso ir's run 12.99 at autozone

 

PLat Bosh seems to run fine on my car 1997 Maxi with 120,000 miles

 

Yeah me too, i got the 4+ Bocsh

 

i am using Bosh...with no problem

 

It's common knowledge in this forum that the Bosch plugs should be avoided. They are better suited for European cars. Stick with the NGK plugs.

I still have the OEM platinum plugs in after more than 11 years and almost 62K, mostly highway miles, and the Max runs like the day I bought it. When it comes time to replace them, say at 75K, it's NGK laser platinums all the way.

 

NGK v-power

 

This fluckin guy... I am now aproaching that # in my 2003 ...

 

NGK Coppers....nothing better

 

I did that in 18 months.

 

What he purchased was the NGK Iridium IX which has an Ir center electrode (.7mm) with a standard (Ni) ground they run for ~$6 each(last on avg. 40-55k miles), while the NGK laser cut Iridium has an Ir center electrode with a Pt Ground electrode and cost ~$17 each. (last on avg. 100k+ miles)

The Denso Iridiums have a smaller Ir center electrode (.4mm) than the NGK but also have a standard (Ni) ground electrode although grooved and cost ~$12 each. (last on avg. 40-55k miles)

(Double platinum plugs last on avg. 75-100k miles)

The benefits of the Ir plug are that the element is very hard (Mohs: 6.5), has a very high melting point (2443°C), excellent electrical conductance (0.197 106/cm), and a great ablility to resist heat transfer (0.816 W/cmK). Due to these properties an Ir electrode can be much smaller than the other elements on the list, transfers electricity better than all but Cu, and resist heat transfer better than all but Pt.

Copper is a great conductor of electricity with only Ag being better, but Cu is very soft, absorbs heat at a incredible rate, and has a very low menting point so Cu plugs do not last very long (10-15k miles on avg.)

Here is a table of common electrode elements
Conductance of electricity larger numbers=higher transfer, Hardness larger=harder, Thermal conductivity larger=ammount of heat it can transfer from another substance to itself

0.596 106/cm Copper Cu 29 |melting point (1084.6°C)|hardness Mohs: 3|thermal conductivity 4.01 W/cmK|(non-brittle metal)

0.197 106/cm Iridium Ir 77 |melting point (2443°C)|hardness Mohs: 6.5|thermal conductivity 0.816 W/cmK| (very brittle metal)

0.143 106/cm Nickel Ni 28 |melting point (1453°C)|hardness Mohs: 4|thermal conductivity 0.907 W/cmK| (non-brittle metal)

0.0966 106/cm Platinum Pt 78 |melting point (1772°C)|hardness Mohs: 3.5|thermal conductivity 0.716 W/cmK| (non-brittle metal)

(references: http://environmentalchemistry.com ,http://www.gordonengland.co.uk/hardness/mohs.htm, http://www.webelements.com)