I am going to replace the spark plugs in my 98 discovery. What plugs would you use?

And yes I own a Jeep too. Dont hold that against me!:roxy:

I run NGK BPR5EY and have been happy.

http://www.partsamerica.com/product_images/AAP/NGK/NGK46.jpg

Great. Thanks.:rolleyes:

Originally posted by Jeeptoy91
Great. Thanks.:rolleyes:
Better get the smile thing down fast Newbie, You just insulted me. :mad3:

Sorry.:(

Genuine ones.

Seem to run best for me but cost a few bucks

Ron

Tell me you don't use Genuine wires as well?:confused: :confused:

I am a founding brother in the magnecor cult

Ron

All I'd say is don't get Bosch platinum or platinum +4. NGK is good stuff too.

just to bring this thread back up, NKG are good, any other suggestions? and what wires do you reccomend for a '95 4.0?

I've got some Bosch +4's in the Disco...seems to run fine with no miss (unless I hose down the engine compartment...thanks Mikie!), but the idle is kinda rough. I might try a conventional plug to see if that cures the rough idle (unless it's time for a new timing set).

In the RR, I run either the cheap Bosch coppers or the cheap Autolites...I figure I have to replace them more often, but I am at least checking the plugs out more often.

How can you justify spending more than $0.98 on an Autolite?

It's just a spark plug in a forty year-old engine.

I can't see spending more $ for a Champion plug in a green box.

i use champeens and they've been happy. forgot the p/n - i'll look later when i'm out in the shop.

In my 3.5 rrc I use NGK bp6es plugs. Oddly enough, its the same plug that I use in the mini.
Been happy with them in both vehicles.

Originally posted by SeaRover
i use champeens and they've been happy. forgot the p/n - i'll look later when i'm out in the shop.

RN 11YC 4

The fancy Champs are 3322

Shouldn't that be BPR6EY?

According to NGKs website the above part number is correct.


Originally posted by Old Scout
I run NGK BPR5EY and have been happy.

http://www.partsamerica.com/product_images/AAP/NGK/NGK46.jpg

Originally posted by JMyerz
Shouldn't that be BPR6EY?

According to NGKs website the above part number is correct.




Rover fuel management sucks, I run a slightly hotter plug because of it.

http://www.ngksparkplugs.com/images/chartheatratingflowpath.gif

Originally posted by Old Scout


Rover fuel management sucks, I run a slightly hotter plug because of it.

http://www.ngksparkplugs.com/images/chartheatratingflowpath.gif

FWIW, and somebody can correct me if I am wrong, but platinum plugs typically run a tic hotter than the conventional plug they replace...

Paul,

I thought you were too cheep to buy new plugs i would have guesed you too just scrape and gap LOL



FWIW Single Post Bosch Platinum, They invented the Spark plug so ill stick with them

I just changed my plugs. I was running the NGK BPR5EY, which I think is a hotter plug. When I pulled them they seemed to be running too hot. Almost no deposits and a white electrode. So I went back to the standard champions. We'll see what happens.

Originally posted by UPOVR
I just changed my plugs. I was running the NGK BPR5EY, which I think is a hotter plug. When I pulled them they seemed to be running too hot. Almost no deposits and a white electrode. So I went back to the standard champions. We'll see what happens.

No deposits and a white ash is normal.

A grayish tan to while color indicates the correct heat range spark plug is in use, the fuel and ignition systems are in good shape and overall engine mechanical condition is good.

http://www.nightrider.com/biketech/spkplghnbook.htm

I agree with OS here. And Bosch platinum suck for rovers. They have no surface area and foul to early in life from rover fuel systems. That hot or the regular NGK are what I use for rover engines. The Champions are just okay for rover use.

IMHO for what it is worth.
JP

No deposits and a glazed shiney look. definitely running hot. I know what a proper running plug should look like, and this wasn't it. They almost looked as though the engine hadn't run, that they were brand new. no bueno IMO.