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Topic Review (Newest First)
09-16-2013 05:32 PM
Pink_Percy I changed my plugs in 2009 and used Champions. Ran great. I changed them last week to Autolites and its running like complete s%$t now. I'm going back to champions. 4 years and 65k miles on a set of plugs is a good thing as far as I'm concerned
09-16-2013 05:01 PM
kawzak I bought the Bosch platinum before checking into the "Jeep engine issues" with them. Six of them are still in a box in my garage. I put Autolite platinum in my 98-4.0L TJ after reading wisdom from others who know. I too had good results with Bosch in Toyotas, and Hondas. Just goes to show you a little searching can save you some $$$.
09-16-2013 04:52 PM
ArthurTJ04 What should I be using on my 04 wrangler sport, 4.0 5spd
currently with 89000 miles on it.
07-18-2013 06:44 PM
Jerry Bransford Bosch plugs work fine in some vehicles, just not very well for very long in Jeep engines. A Bosch engineer surmised years ago that it was a heat range issue since they don't have as many heat range models as some other spark plug manufacturers do.

Stick with Autolite, Champion, or NGK and the engine will run fine.
07-18-2013 06:38 PM
kawzak What is wrong with Platinum Bosch plugs? I have used them in Toyota 4 cyl in the past,with excellent results/milage. Did they change origin of manufacture and get cheap
materials or something ?
07-18-2013 04:37 PM
Chuck59
Quote:
Originally Posted by Verf View Post
Try the free app called aCar. YOU input the price per gallon (or liter), how much you put in, etc. Its as accurate as you are going to get
Similar to mine. I think I use "Mileage Keeper". Free app. Simple to use.
07-18-2013 04:19 PM
Verf Try the free app called aCar. YOU input the price per gallon (or liter), how much you put in, etc. Its as accurate as you are going to get
07-18-2013 02:04 PM
Chuck59 Tap on the pic to enlarge to read easier. The app has calculated my cost per gallon I think?

Chuck
07-18-2013 01:35 PM
RevCo666
Quote:
Originally Posted by Wheats View Post
I was more interested in what your paying for gas. I'm paying $4.59 for regular
Up here, gas just spiked to 1.45$/liter. So if I'm calculating that correctly, thats 5.44$/gallon... Correct me if I'm wrong. (sorry to stray off topic.)
07-18-2013 01:26 PM
Wheats I was more interested in what your paying for gas. I'm paying $4.59 for regular
07-18-2013 01:00 PM
Chuck59
Quote:
Originally Posted by Derp View Post

Your jeep on donuts or something?
Derp, So happy you called B.S. I never "exaggerate". Got to show you my cool app too!
07-18-2013 12:53 PM
Chuck59
Quote:
Originally Posted by Jerry Bransford View Post
That is definitely, by head and shoulders, the best mpg I have ever seen on a Wrangler TJ. My '04 TJ has never in my experience produced even 17 mpg, your worst mpg. I'd have to guess small tires & a very good conservative driver.
Michelin M&S P235/75/15's, and yes, a conservative mature driver . Everybody sets their own rigs up for their own specific needs and desires. I enjoy "Overland" exploration. Will be heading to Alaska next summer. MPG is important to ME.
07-18-2013 12:28 PM
Jerry Bransford That is definitely, by head and shoulders, the best mpg I have ever seen on a Wrangler TJ. My '04 TJ has never in my experience produced even 17 mpg, your worst mpg. I'd have to guess small tires & a very good conservative driver.
07-18-2013 12:28 PM
RevCo666
Quote:
Originally Posted by Derp View Post
Your jeep on donuts or something?
Hard to tell from the pic but he could be very well running stock tires...
07-18-2013 12:25 PM
Derp
Quote:
Originally Posted by Chuck59 View Post

This is my mileage log app print. Changed plugs on 12th.

Read it and weep
Your jeep on donuts or something?
07-18-2013 12:14 PM
Chuck59
Quote:
Originally Posted by derp View Post

i call b.s. No way you're getting over 20.


Attachment 274441

This is my mileage log app print. Changed plugs on 12th.

Read it and weep
07-18-2013 01:12 AM
Derp
Quote:
Originally Posted by Chuck59 View Post

Update on mileage. Went from 19.7 mpg to 21.2 mpg with the Autolite APP985's.
I call b.s. no way you're getting over 20.
07-17-2013 07:22 AM
Chuck59
Quote:
Originally Posted by Jerry Bransford View Post
Platinum is on just one side of the gap with the AP985, platinum is on both sides of the gap with the APP985. Distributorless 4.0L ignition systems used in 2000 and newer TJs require both sides of the gap be made from the same material.

Autolite's XP985 works very well.

Where people sometimes have a little trouble is getting the plug at the front out, it is positioned under the a/c compressor or alternator. Using a 3/8" extension and wobble-joint/u-joint between the spark plug socket & extension makes that a much easier job. Getting the spark plug boots off can sometimes be a problem from engine heat causing them to stick. I finally broke down & bought a spark plug boot removal tool that helps break that seal so they can be pulled off more easily, they are like a pair of skinny pliers with vinyl covers over the gripper part.
Update on mileage. Went from 19.7 mpg to 21.2 mpg with the Autolite APP985's.
07-05-2013 10:20 AM
Jerry Bransford
Quote:
Originally Posted by Chuck59 View Post
What is the difference between the AP & APP-985's? They look the same? Anyone know?
Platinum is on just one side of the gap with the AP985, platinum is on both sides of the gap with the APP985. Distributorless 4.0L ignition systems used in 2000 and newer TJs require both sides of the gap be made from the same material.

Quote:
Originally Posted by Verf View Post
But we are talking Jeeps, which I am very new to. To those who use iridium, which plug are you happiest with?
Autolite's XP985 works very well.

Quote:
Originally Posted by Steeljag View Post
Is there a special tool needed to remove / insert the plug closest to the fire wall? I read here some had a hard time with it.
Where people sometimes have a little trouble is getting the plug at the front out, it is positioned under the a/c compressor or alternator. Using a 3/8" extension and wobble-joint/u-joint between the spark plug socket & extension makes that a much easier job. Getting the spark plug boots off can sometimes be a problem from engine heat causing them to stick. I finally broke down & bought a spark plug boot removal tool that helps break that seal so they can be pulled off more easily, they are like a pair of skinny pliers with vinyl covers over the gripper part.
07-05-2013 09:33 AM
Steeljag Glad I found this thread. Jeep is about to hit 70,000 mi, and I thought I would save time and drop it off for new plugs and oil change at local jeep dealership.

Called first and was advised it would be $129.00 to change the plugs. Taking a deep breath I confirmed 6cyl Jeep TJ wrangler......and was told the high cost was for "special plugs" needed by that model.

So much for saving some time......I'll grab the $30.00 in plugs and find the 45 minutes!

Is there a special tool needed to remove / insert the plug closest to the fire wall? I read here some had a hard time with it.
07-05-2013 09:11 AM
Verf I'm a fan of iridium's for longevity. On my performance cars, I use Bosch and have been more than happy with both performance and fire, getting better combustion and better mpg (its a twin turbo, and secondary detonation is a death sentence to heads).

But we are talking Jeeps, which I am very new to. To those who use iridium, which plug are you happiest with?
07-05-2013 06:54 AM
Chuck59 2004 LJ with a 4.0L. Changed plugs yesterday. I was experiencing a slight miss and rough idle. Particularly when warm. The Autolight AP-985's had about 40,000 miles on them and really didn't look all that bad.

Put in Autolite APP-985's (double platinum) and the miss went away and now she idles smooth.

What is the difference between the AP & APP-985's? They look the same? Anyone know?
09-10-2012 03:00 PM
UnlimitedRubicon
Quote:
Originally Posted by DBoat View Post
Quote:
Originally Posted by HarryJeepGuy View Post
I've been running the 7034's for a long time in my 01 and like them.
Thanks, think I can get 50K miles out of them?

I chucked the OEMs at 30k (looked terrible) and put in some 7034s. Just checked them at 70k and they look great.
09-10-2012 10:48 AM
Mudsearcher77
Quote:
Originally Posted by lindel

I just did mine too. Status of the ones that I pulled out was basically unknown, but didn't look bad. Aside from the gaps being all over the place. Some as much as .060, some as small as .025. I don't think the PO gapped them at all, just stuck them in. Oddly enough, he used dielectric grease on them, probably because the seller either gave it to him or recommended it.
I didn't use any grease, read that it's not needed in today's plugs.


My Jeep is running 100% better now, I installed a K&N air filter and autolite xp985 plugs and could not be happier...smoother idle, quicker acceleration, overall smoother. Very pleased!
09-09-2012 07:56 PM
Doc Wesley Glad I found this thread was about to get new plugs!
09-09-2012 11:03 AM
lindel
Quote:
Originally Posted by Mudsearcher77 View Post
Just installed the new autolites, stock ngk's were gapped out to .80 after 101k miles...first time ever changing plugs, took about 30 mins

Attachment 158217

I just did mine too. Status of the ones that I pulled out was basically unknown, but didn't look bad. Aside from the gaps being all over the place. Some as much as .060, some as small as .025. I don't think the PO gapped them at all, just stuck them in. Oddly enough, he used dielectric grease on them, probably because the seller either gave it to him or recommended it.
09-09-2012 10:52 AM
autopc25
Quote:
Originally Posted by epossum View Post
Gees, I just checked Mopar for OEM spark plugs for my '97 4L. $2.30 each which is OK but $14.95 to ship them UPS which is their cheapest option. They must be solid gold and weigh about 50 pounds. The total is $28.75 before tax or any other charges they care to add on. I guess a trip to the dealer would be cheaper, at least before gas gets any more expensive.
The economy is slow and dealers want business selling cars and parts. $2.00-$2.30 for the Mopar plugs is a good price. Ask local Mopar dealer for a "jobber discount" for the plugs to save on the crazy shipping cost. Or go to any parts store for Champions.
09-09-2012 09:22 AM
HarryJeepGuy
Quote:
Originally Posted by epossum
Gees, I just checked Mopar for OEM spark plugs for my '97 4L. $2.30 each which is OK but $14.95 to ship them UPS which is their cheapest option. They must be solid gold and weigh about 50 pounds. The total is $28.75 before tax or any other charges they care to add on. I guess a trip to the dealer would be cheaper, at least before gas gets any more expensive.
F that. Just go to any parts store and get Champion 3034 plugs.

99 and older 3034, 2000 and newer 7034. (as posted earlier in this thread and many others.) I run the 7034's in my 01 and couldn't be happier.
09-09-2012 09:07 AM
Mudsearcher77
Quote:
Originally Posted by DBoat

I didn't know about that mod. How does one do that? Any post cut issues?
No issues, there is a tie strap holding the coil rack to some wires towards the back, if you cut the strap you can move the coil rack around alot easier
09-09-2012 08:14 AM
epossum Gees, I just checked Mopar for OEM spark plugs for my '97 4L. $2.30 each which is OK but $14.95 to ship them UPS which is their cheapest option. They must be solid gold and weigh about 50 pounds. The total is $28.75 before tax or any other charges they care to add on. I guess a trip to the dealer would be cheaper, at least before gas gets any more expensive.
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