I have searched for info and didn't find much.
I have just replaced my rear plugs and noticed I was given plugs that end with a 5 instead of a 6. Old and new are NGK R.
Is that significant? Car runs fine. I thought it may refer to heat range.

just found this
http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm
does that mean they run hotter or suit hotter engines?

I have searched for info and didn't find much.
I have just replaced my rear plugs and noticed I was given plugs that end with a 5 instead of a 6. Old and new are NGK R.
Is that significant? Car runs fine. I thought it may refer to heat range.

Hi Sam...

If you have a factory 3.5L V6 with EGR then PFR5J-11 is the correct Platinum plug to use

This hotter working plug is used to burn off the EGR deposits in order to provide a more reliable combustion

If you removed a PFR6J-11 then it was the type normally fitted to the 3.0L engine

If you later modify the engine to produce significantly more power, or if you fit a catch can and improve combustion to get rid of that oily soot that clogs up the intake and your CAT, then you can go to a '6' which will have less tendency to 'knock'

Cheers, Barry

It just means they gave you plugs that are one heatrange hotter,good if your engine uses a bit of oil etc and has high km`s as the tip runs hotter and burns off any oil etc that may get past the rings,the only downside is they are more suceptable to pre-igntion and pinking ,but that shouldnt pose to much of a porblem in a stock engine with decent ecu managment

Steve

Thanks guys.
It is a 1996 KE Verada with the 6G74 3.5L V6.
I was just sceptical so wanted to check.

Hey Guys,

While we're on the subject i've got an 03 TJ exec. It's got a PCVV bypass (catch can), sports muffler and a K&N oval pod. I usually run on 95 octane as well. Do you think i should run a hotter plug? Everything else is stock. No ECU stuff done.

Cheers

Hey Guys,

While we're on the subject i've got an 03 TJ exec. It's got a PCVV bypass (catch can), sports muffler and a K&N oval pod. I usually run on 95 octane as well. Do you think i should run a hotter plug? Everything else is stock. No ECU stuff done.

Cheers

Heeeeeyyyyy....

No - you are already running a hotter plug

First check the plugs for colour - if white/light grey then you are probably running too lean, due to the higher intake air flow of the oval pod

If they are Champions and they are all of a similar colour, replace them with NGK

If you also have an unpleasant 'droning' from fitting the sports muffler, you can largely fix both problems by fitting a Fuel Rail Tuning Kit - and it will perform with better torque in the 1500 - 3000RPM range

PM me if you want to try the kit with a money back guarantee

Cheers, Barry

PM? Sorry i'm a newb.

I've got NGK's on the front and rear, but the rear are iridiums as standard aren't they. Fronts have a different code to the backs. I went to replace the rears and got the part # from the owners manuel and they matched the iridium code. Rear bank runs differently to the front thats my only conclusion. Whats the go with the fuel rail kit?

I run the 6's in my KE as they are slightly cooler plug.

Car runs fine.

Also, the 3.5 in the KE does NOT use EGR.

I've got NGK's on the front and rear, but the rear are iridiums as standard aren't they. Fronts have a different code to the backs. I went to replace the rears and got the part # from the owners manuel and they matched the iridium code. Rear bank runs differently to the front thats my only conclusion. Whats the go with the fuel rail kit?

Hey the Fonz

Firstly from previous post - PM means you can send a member a private message by clicking on the main name on the left side of his/her post and follow the prompt

The plugs are actually platinum as standard on the rear, and convential on the front - but I prefer to have platinum all round

Iridiums are a higher quality (and more expensive) option

The Fuel Rail Tuning Kit is a set of 4 alloy mounts for the fuel rails that are simply fitted to replace the standard plastic ones

This raises the temp of the fuel sufficiently to vaporize more easily, and restores the air-fuel ratio when you have fitted a hi-flow intake or air filter

You will notice less soot from the tailpipe and better torque for hill-climbing in the low to 3000 Rpm range

Cheers, Barry

Cheers Barry i'll think about it. Still got other things i'de like to do first though.

Thanks mate.

I Hate changing the rear spark plugs on magna's...gotta remove the whole damn intake manifold! not to mention that bar thing on the front that fastens them on.

Oh well, the platinum plugs that i've got in there are supposed to last 100,000k's, another 80,000k's to go still :D

i know this thread is slightly old but i thought it would save starting a new one.

Barry,
with your fuel rail kit are you saying it would be better to go with the PFR6J-11 plugs like for the ralliarts

I Hate changing the rear spark plugs on magna's...gotta remove the whole damn intake manifold! not to mention that bar thing on the front that fastens them on.

Oh well, the platinum plugs that i've got in there are supposed to last 100,000k's, another 80,000k's to go still :D


intake manifold takes on average 15min to remove with practise

Im a newb to this also.

I am about to install Barry's kits, and i thought i might just install some 6 new iridium spark plugs.

I just have a K+N panel filter.

Can someone recommend a brand and model number that i should purchase to suit a 2004 TL ES tippy.

EDIT: PFR6J-11, as posted above, is this the NGK iridiums that i need?

i know this thread is slightly old but i thought it would save starting a new one.

Barry,
with your fuel rail kit are you saying it would be better to go with the PFR6J-11 plugs like for the ralliarts

Yes - platinum plugs are designed to reduce the incidence of mis-fire, especially when used with EGR type engines

When you have a Fuel Rail Tuning kit there is improved combustion and less soot fed back from the exhaust into the intake - so you can go to a cooler plug and have also less chance of pre-ignition

Cheers, Barry

Im a newb to this also.

I am about to install Barry's kits, and i thought i might just install some 6 new iridium spark plugs.

I just have a K+N panel filter.

Can someone recommend a brand and model number that i should purchase to suit a 2004 TL ES tippy.

EDIT: PFR6J-11, as posted above, is this the NGK iridiums that i need?

Hi Birchy

I did not go past having platinums all round - so I can't recommend iridiums from experience, but many AMC'ers have reported good results

PFR6J-11 are the NGK's to go for if you want platinum plugs

Cheers, Barry