Spark Plug questions (1 Viewer)

[TN_LandCruiser]

Didnt find anything on this on my iniatial search...hopefully its not a repost.

Im looking to replace plugs and dist cap. Getting mixed info from parts stores. Toyota wont tell me the manufacturer of their plugs, Advance Auto says OEM are NGK's and AutoZone and O'Reilly's says they are Denso.
Can anyone confirm the best plugs for a '92 FJ80 4.0L?

What about a cap? Any 'ol cap or only OEM?

 

[CappyKD]

The Owners manual calls for Denso's or NGK's I would only go OEM and do the wires, pcv pcv grommet and air filter while you are there..

 

[tomatopants]

The plugs and wires are Nippon Denso. They won't tell you? They must be hard up for money or something.


Not sure about the distributor cap, they're probably just Toyota.

Correct me if I'm wrong. They might not have Nippon in their name, but they definitely have Denso.

 

[TN_LandCruiser]

Ok, then which are better...they are both about the same price...

Already did the air filter. Have to find the PCV...any pics of its location?

 

[CappyKD]

PCV is on the middle top of the valve cover. I used Denso Iridium and Denso wires. I'm very happy with them.

 

[NeverFinis]

I think the originals could be NGK.

I will be going to iridiums mainly because I don't want to be changing spark plugs that often, I am too busy fixing other stuff and changing spark plugs is one less thing to change.

http://www.sparkplugs.com/results_app.asp?productTypeID=1&AAIA=1187535

 

[jonheld]

As already stated, keep all ignition parts OEM. Your dealer sounds like an idiot. I would promptly contact one of the online parts dealers that are on this forum (John Hocker or Cdan) and make your purchases through them. You will get the correct parts the first time.

Your PCV valve is located at the very rear of the top of the valve cover and has a hose that exits and makes a 90 degree bend to the right (as you're looking towards the rear of the motor). Make sure you purchase a new PCV valve gasket as the one you pull out will probably be done.

 

[jonheld]

Hey TN_LandCruiser,

In your first post you mentioned a 92 FJ80 and your signature says 94. Which one are you looking for the PCV valve on?

 

[TN_LandCruiser]

Its a '92 LC. I have a '94 GMC truck. Thanks for catching that! I just fixed it!

Thanks for all the good info!

 

[mickdundee..]

G'day TN_LandCruiser,
With the info i've got, the 3fe came with both, Denso and NGK.
I've had a good run using NGK Iridium's in my 3fe, and so far they have done more than 70,000 miles Leads and Cap used are OEM (Denso). cheers mick

 

[TN_LandCruiser]

mickdundee, thanks so much for the info...this is exactly what Im looking for. What manual did you get that out of? Need to get me one of those...

 

[flem0061]

After changing mine a few months ago I'm going with the iridiums next time - that job was a PITA. Fortunately I fit in the engine bay ok.

 

[dcFJ]

The owners manual, if you still have it with your '92, will have the spark plug info (numbers, brand, etc..) in it. Look in the index and search for spark plugs. I used the Denso OEM on my replacement, but you can use the NGKs as well...so it's your choice. List at the dealership is around $2.22. CDan can get them for you for about $1.60 IIRC.

On your '92, you have two PCV hoses...one is at the back of the valve cover (that's where your PCV valve and grommet are), and the other is in the middle of the valve cover and it connects from the valve cover to the air tube. Both are very easy to spot, and replace. The PCV valve is a little tougher, but not too bad...the worst part is the grommet replacement..make sure you don't let it break off and fall into the valve cover...search the site for info on that procedure.

And that's it.

 

[TN_LandCruiser]

Ok, so I replaced the old-as-dirt Autolite plugs that were in my LC...Everyone of them looked the same...like the pic...what causes the white build up???

 

[TN_LandCruiser]

Pic #2

 

[Spicer '92]

FYI the OEM Spark Plug leads are Yazaki. Yeah those plugs look terrible, maybe your 3fe will be fast after all this is done . . . . ok probably not but I have one too and i love it !!!

 

[TN_LandCruiser]

I replaced the Autolite plugs with OEM Denso's...have to order the cap and rotor. No one, including Toyota, have it in stock.
Plug wires will come next, but they are upwards of $75. Next paycheck.

Toyota mechanic friend of my brothers told me that the plugs werent burning hot enough for the application, hence the build up on the plugs. Another example of why to use OEM.

I replaced the rear PCV, but apparently didnt read the post correctly and only bought one. It did not come with a new crommet...so I reused the one that was in there. Need to replace the front one as well.

What exactly does the PCV valve do anyway?

 

[cary]

After changing mine a few months ago I'm going with the iridiums next time - that job was a PITA. Fortunately I fit in the engine bay ok.

If you are looking for longer life, Platinums are the answer.

Iridiums come in two forms, fine tip (Denso .4mm) and thicker tip (NGK .7mm). The thicker tips have the same life as good platinum plugs, but are supposed to perform a bit more stability through their life and can tolerate higher temps (i.e. boosted engines). See the SAE PDF link on this page:


http://sparkplugs.com/sparkplug411.asp?kw=Iridium&mfid=0

 

[sjcruiser]

After 50K+ miles, my Denso Iridium plugs still performed well on my truck, even though all the pointy parts of the electrodes had worn off. I'd recommend them if you're a lazy one like me who don't want to deal with the hassle every year or so as with the orig. copper ones.

Cary,

What do you think about the Bosche (NEW) quad ground Iridium Fusion plugs? I'd like to try them out next (installed OEM plugs temporarily as I found a leaky plug grommet).

 

[cary]

After 50K+ miles, my Denso Iridium plugs still performed well on my truck, even though all the pointy parts of the electrodes had worn off. I'd recommend them if you're a lazy one like me who don't want to deal with the hassle every year or so as with the orig. copper ones.

Cary,

What do you think about the Bosche (NEW) quad ground Iridium Fusion plugs? I'd like to try them out next (installed OEM plugs temporarily as I found a leaky plug grommet).

Run from the Bosch Plugs, their quality has gone down over the years. There have been many reports of poor performance and electrodes breaking off. The final hint to me, was when BMW went to NGK for most OEM applications.

Platinium plugs will last 60k in the 80 series without problem. After careful research, I went with the Denso PK16R8 plantium in the original heat range from sparkplugs.com (about $7 each)