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Old 01-26-2010, 11:55 PM   #1
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what's the best spark plugs?

i wanted to change my spark plugs and wondering if there's any preferences. i have a 2.5 if that helps any

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Old 01-27-2010, 12:00 AM   #2
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I just went and got mopar plugs from the dealer. They were a little expensive. $27 for 6.

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Old 01-27-2010, 12:02 AM   #3
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thats not to bad i guess unless they put them on then its a raping
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Old 01-27-2010, 12:07 AM   #4
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For the 2.5L and older 4.0L engines with a distributor and ignition wires, you can't beat the Autolite AP985 which is a platinum plug. It'll perform as well as any plug out there while lasting 3X as long as a conventional plug.
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Old 01-29-2010, 06:15 AM   #5
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spark plugs

Quote:
Originally Posted by turk View Post
i wanted to change my spark plugs and wondering if there's any preferences. i have a 2.5 if that helps any
Hi,
I am the tech manager for Autolite spark plugs. If you want the latest spark plug technology, try our XP series iridium enhanced fine wire spark plugs. You can get them at any automotive retailer. Yes, they are costly at around 6.50 each. That being said, you will experience quicker starts, better combustion and power, better fuel efficiency and they will last in excess of 100k miles with zero gap growth.
If you have any other ignition or spark plug questions, I can be reached at Jay.Buckley@Honeywell.com
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Old 01-29-2010, 08:36 AM   #6
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I don't know about spending $6.50 on a plug but I agree with Jerry on the Autolites. I've been using Autolites for over 35 years in everything from an ol H-D Panhead to all the Mopars and everything else I've owned. They work and the work for a long time.
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Old 07-29-2010, 08:04 AM   #7
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spark plugs

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Originally Posted by turk View Post
i wanted to change my spark plugs and wondering if there's any preferences. i have a 2.5 if that helps any
Dude,
You should use the Autolite XP985. This is an iridium fine wire plug with a platinum button on the sidewire. It requires less voltage to fire and make a 20% larger flame kernal for improved performance. I am the technical manager at Autolite, they really work great.
PM me with your mailing address and I will send you a set if you will post your results on the forum. Note to others, he asked first and I cannot extend this to all on here, these plugs retail for 7 bucks!
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Old 07-29-2010, 10:33 AM   #8
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Thanks for the technical info motorking but I'm old school like my 4.0 and my head is spinning. "iridium fine wire with a platinum side button ?"...."larger flame kernal ?"..

I'll stick with my simple copper plugs (Champion 4412 truck plugs, no they aren't discontinued). Or Autolite plain 985's.

I know they don't last 100K, but I like changing my plugs every 30K.
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Old 07-29-2010, 10:41 AM   #9
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Motorking, I sent an email to Autolite regarding an incorrect spark plug listed in your guide a few years ago but never heard back... your spark plug guide includes the AP985 as being suitable for the newer TJ distributorless 4.0L engine that uses a waste-spark ignition design. That AP985 is an incorrect spark plug recommendation for that particular engine. The only suitable platinum plug for that newer 4.0L engine is the APP985. Jeep even has a TSB out advising not to use single-tipped platinum plugs like the AP985 which says to remove them when found or to look at the spark plugs when a poorly running engine is encountered.

People that install single-tipped platinum plugs like the AP985 into their newer distributorless (coil on plug) waste-spark 4.0L engines will eventually start seeing misfires, etc.

The AP985 is an excellent plug in the older 4.0L engines and is what I ran in my '97 4.0L engine that had a distributor and conventional ignition system.

I provided supporting documentation in that email to Autolite but no one bothered responding. Not to use a single-tipped platinum spark plug in the newer 4.0L engines is well known among Jeepers.
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Old 07-29-2010, 10:44 AM   #10
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Quote:
Originally Posted by pokey View Post
Thanks for the technical info motorking but I'm old school like my 4.0 and my head is spinning. "iridium fine wire with a platinum side button ?"...."larger flame kernal ?"..

I'll stick with my simple copper plugs (Champion 4412 truck plugs, no they aren't discontinued). Or Autolite plain 985's.

I know they don't last 100K, but I like changing my plugs every 30K.
hey, no worries. Just thought since your asking what is the best, well the best is the current crop of iridium fine wire plugs from Autolite and other plug makers. The fine wire center electrode is no gimmick, even the tightwad automakers are specing them as OE. When your climbing a hill and your 4.0 hiccups due to a misfire, you may rethink not using them, its the cheapest way to upgrade your ignition system.
Peace!
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Old 07-29-2010, 10:50 AM   #11
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Quote:
Originally Posted by Jerry Bransford View Post
Motorking, I sent an email to Autolite regarding an incorrect spark plug listed in your guide a few years ago but never heard back... your spark plug guide includes the AP985 as being suitable for the newer TJ distributorless 4.0L engine that uses a waste-spark ignition design. That AP985 is an incorrect spark plug recommendation for that particular engine. The only suitable platinum plug for that newer 4.0L engine is the APP985. Jeep even has a TSB out advising not to use single-tipped platinum plugs like the AP985 which says to remove them when found or to look at the spark plugs when a poorly running engine is encountered.

People that install single-tipped platinum plugs like the AP985 into their newer distributorless (coil on plug) waste-spark 4.0L engines will eventually start seeing misfires, etc.

The AP985 is an excellent plug in the older 4.0L engines and is what I ran in my '97 4.0L engine that had a distributor and conventional ignition system.

I provided supporting documentation in that email to Autolite but no one bothered responding. Not to use a single-tipped platinum spark plug in the newer 4.0L engines is well known among Jeepers.
sorry they never responded, I will rip on the catalog guys for not doing so. If you look up the plugs at Home :: Autolite Spark Plugs, it lists XP985 (iridium fine wire center, platnum button side wire as first choice and APP985 as second choice. Once a paper catalog is out, there is no way to change it. The listings on the web catalog are always the most up to date. If any of you Jeep guys want to learn more about plugs and ignitions, go to autolitechallenge.com/pro and watch the videos, you get a free carhart jacket if your one of the first
3500 to watch by august 1st.
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Old 07-29-2010, 10:55 AM   #12
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It was on your online catalog, not the printed catalog, where I noticed the error. That is what I emailed Autolite about.

Your online catalog at Autolite - Application Look-up still shows the AP985 as being suitable for the newer distributorless waste-spark ignition equipped 4.0L engine. I just looked it up for my 2004 Jeep Wrangler with the 4.0L engine again and it still shows the AP985 as being suitable. It is definitely not.
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Old 07-29-2010, 11:33 AM   #13
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Quote:
Originally Posted by Jerry Bransford View Post
It was on your online catalog, not the printed catalog, where I noticed the error. That is what I emailed Autolite about.

Your online catalog at Autolite - Application Look-up still shows the AP985 as being suitable for the newer distributorless waste-spark ignition equipped 4.0L engine. I just looked it up for my 2004 Jeep Wrangler with the 4.0L engine again and it still shows the AP985 as being suitable. It is definitely not.
It is correct.
We offer XP985 as first choice recommended plug
APP985 as second choice recommended plug
Then the AP985 and regular copper 985s are listed below that. Either of those will work fine in a DIS ingnition untill side wire gap erosion occurs (typically around 28-35k miles.) That is exactly why we list and recommend the XP and APP as first and second choice. Unfortunately, there are those who value low price before any technology, that is why we sell the single platinum and copper plugs as well. If it was up to me, I wouldnt even sell copper plugs at all.
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Old 07-29-2010, 11:41 AM   #14
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I think I'll just stick with the Autolite copper... I'll try my best not to threadjack with why platinum and iridium aren't inherently better in every application. :-)
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Old 07-29-2010, 11:42 AM   #15
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Of course if you ask Autolite - they are the best. (Aren't they part of Fram, the self destructing oil filters?)

If you ask Champion, they are the best.

Same with AC, NGK, Bosch, -- even The gimmick plug makers claim they are wonderful (Yellows, reds, pinks, blues, etc).

What does Jeep put in? Look at the underhood label - it tells what they designed the head to use. Make and number.

No - spark plugs will NOT give you another 500 HP, no matter who says it!

Some plugs will create destructive detonation, even if you don't hear it. ie: splits, multis, etc.

Some plug makers, like Hitler's Revenge, use the "one size fits all" system. Ask your wife how "one size fits all" fits her.
Just because it fits the hole doesn't mean it's safe to use.

Remember - advertising, whether paper or the Internet, does not reject words.
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Old 07-29-2010, 12:00 PM   #16
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Originally Posted by motorking View Post
It is correct.
We offer XP985 as first choice recommended plug
APP985 as second choice recommended plug
Then the AP985 and regular copper 985s are listed below that. Either of those will work fine in a DIS ingnition untill side wire gap erosion occurs (typically around 28-35k miles.) That is exactly why we list and recommend the XP and APP as first and second choice. Unfortunately, there are those who value low price before any technology, that is why we sell the single platinum and copper plugs as well. If it was up to me, I wouldnt even sell copper plugs at all.
That was a completely disappointing response. Even Jeep has a TSB advising against their use and the reasons why a single-tipped platinum plug is not the right plug in a waste spark (DIS) ignition system are well known.

Defend your catalog as much as you want but we have real-world experience with the AP985 not performing well in the newer 4.0L distributorless engine within a short time after installation.

Here's a good writeup for a non-technical managerial type on why spark plugs like the AP985 should not be used in the later 4.0L engines that use a (DIS) waste spark ignition system. http://www.aa1car.com/library/sparkplugs_for_dis.htm

In fact, and this is funny, the information in that article advising against their use came from the engineers at AUTOLITE. Yet Autolite's own catalogs show single-tipped platinums like the AP985 as being acceptable in a DIS type ignition system which of course is not correct. Autolite's own engineers agree, too bad Autolite's catalogs don't.
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Old 07-29-2010, 12:30 PM   #17
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Jerry - same old problem - what if he told the truth? How long would he last in his job?

Same like Jeep Service reps denying warranty claims - "They aren't designed to go off road."
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Old 07-29-2010, 02:23 PM   #18
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I do believe this has been cleared up properly for me for I now know what plug not to use.
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Old 07-29-2010, 02:33 PM   #19
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just ordered the diamond fire plugs from quadratec a few days ago and should be delivered today. i was told that they work good so we will see, also got a distributer cap and rotor along with spark plug wires. i hit the 100k mile mark a few weeks ago, still need to do the o2 sensor, and a few others.

just upgraded a few of the wires under the hood due to the new stereo i installed.
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Old 07-29-2010, 03:41 PM   #20
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Have not used these but know a few people that have, and love them. Anyone tried them in a Jeep, or any other application?

Spark Plugs | Automotive Spark Plug | Motorcycle Spark Plugs | E3 Spark Plugs
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Old 07-29-2010, 03:58 PM   #21
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Quote:
Originally Posted by motorking View Post
Hi,
I am the tech manager for Autolite spark plugs. If you want the latest spark plug technology, try our XP series iridium enhanced fine wire spark plugs. You can get them at any automotive retailer. Yes, they are costly at around 6.50 each. That being said, you will experience quicker starts, better combustion and power, better fuel efficiency and they will last in excess of 100k miles with zero gap growth.
If you have any other ignition or spark plug questions, I can be reached at Jay.Buckley@Honeywell.com
and you're the tech manager for fram oil filters? i know both are made by allied signal, but that's a broad focus base.

http://www.wranglerforum.com/f8/fram...ing-56024.html
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Old 07-29-2010, 04:03 PM   #22
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Have not used these but know a few people that have, and love them. Anyone tried them in a Jeep, or any other application?

Spark Plugs | Automotive Spark Plug | Motorcycle Spark Plugs | E3 Spark Plugs
those are the ones i ordered and will be delivered today.
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Old 07-29-2010, 04:52 PM   #23
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Interesting on the Diamond fire plugs.
They are just another multi electrode (ground electrode) plug on the market.

They claim it directs the spark toward the piston - if you want that, use the little non-fouler adapters. They have a separate chamber where the oil doesn't affect the spark as much. The spark gets the fire started in one chamber, then a small hole directs the flame out into the rest of the chamber. Very similar to an oxy-actylene torch.
Yes, it will produce a little more power using them. We ran a 3/4 Midget - the engine was getting tired, starting to smoke, pump a little oil. We tried the non foulers in all 4 cyls. It ran fantastic, more power than it ever had - till on the 2nd to last lap it started smoking bad. The driver never made it to the finish line - the engine blew apart. Later upon inspection the pistons looked like they had been melted by a torch. One had a nice flame-cut hole in it!

If that's what you want, use the non-foulers or the diamond plugs.

They won't give YOU any more performance - unless your present plugs are letting you down already. Gap them properly, they'll do what they atre supposed to do -- START A FIRE!

But the Diamonds obviously are high performance plugs - FOR THEM! They no doubt produce more profit than real plugs.

If you use a high performance match to light your BBQ, will your steaks cook faster? Will they taste better?
The plug is the match to START the flame, not do the burning itself.
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Old 07-29-2010, 08:53 PM   #24
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i'm a hot rodder. i currently run a 11:1 small block chevy in my 55, makes decent power, about 425 at the crank. full msd ignition, all the good stuff. i built it to run and run it does.
what plugs have i had the best luck with in it? cheap copper autolites.
i had a heads/cam/intake/nitrous 5.0 mustang before my 55. what plug did i run in it? cheap copper autolites. i ran a little 100 shot of gas, but i also ran 16* initial timing on the hit. i liked the autolites in this application because the electrode strap would melt before a piston. i did this to several plugs, but never hurt the motor and it ran like a scalded dog.

what i'm getting at is you can spend a bunch of cash on fancy plugs that will do this and that, but at the end of the day, you don't need any of that stuff. if you're doing your own maintenance and changing plugs regularly, just get the cheap stuff that gets the job done. proper plug gap, a good set of wires and properly functioning ignition will do more for you than any gee-whiz spark plug.

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