post #1 of Old 06-07-2013, 08:12 AM Thread Starter
jmreagan
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APP985 or AP985 plugs for an 03' TJ?

The question is in the title. I'm doing a tune up and brake job this weekend on my 03' TJ. Which plugs shoud I use, the single tip platinum (AP985), or the double tip platinum (APP985)? The 03' has the coil rail pack, NOT plug wires.
Thanks

-JM


03' Sport, 4.0L, 3.73, 5 speed, D44/D30, 3 inch coil/shock lift, RE track bar, Tera disco's, 35x12.50's Dunlap Mud Rovers MT's, Spidertrax spacers, Viper 5000 alarm, Tuffy console, LOD extreme bumper/tire carrier and front bumper, A-Z rockers, AA SYE, Tom Woods DS, JKS Rear UCA's.
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post #2 of Old 06-07-2013, 08:18 AM
TheBoogieman
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APP985 work best for 00-06'.They will last you 100,000 miles.
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post #3 of Old 06-07-2013, 08:19 AM
Zeep
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Either one is a good choice. Pick one based on your budget.

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post #4 of Old 06-07-2013, 08:23 AM
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Originally Posted by Zeep View Post
Either one is a good choice. Pick one based on your budget.
No that is incorrect. With the distributorless ignition system he has the APP985 is the correct plug, better yet the XP985 plugs will last twice as long.
The AP985 plugs will work with the older ignition systems that still use a distributer cap, rotor, and wires.
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post #5 of Old 06-07-2013, 08:28 AM
Jerry Bransford
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Quote:
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Either one is a good choice. .
No they're not. The AP985 only has platinum on one side of the gap which with the DIS (distributorless ignition system) used on 2000 and newer 4.0L engines will eventually start causing hard to diagnose idle/misfire problems. That is because the 4.0L's DIS fires the plug every stroke and in opposite directions which will eventually cause a plug with different coatings on each side of the gap to fire differently in opposite directions. Between the AP985 and APP985, you must use only the APP985 with 2000 and newer 4.0L engines. It's with 1999 and older 4.0L engines where either can be used. The misfire/bad idle problem became so bad from people using the wrong plug technology that Jeep had to issue a TSB to address the issue. The APP985 has its platinum coating on both sides of the gap so it wears symmetrically with the DIS system's alternating spark directions.

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post #6 of Old 06-07-2013, 09:41 AM Thread Starter
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Thank you BoogieMan, JBTJ, and Jerry. I appreciate your fast responses and for taking the time to explain why I need the APP985's...

03' Sport, 4.0L, 3.73, 5 speed, D44/D30, 3 inch coil/shock lift, RE track bar, Tera disco's, 35x12.50's Dunlap Mud Rovers MT's, Spidertrax spacers, Viper 5000 alarm, Tuffy console, LOD extreme bumper/tire carrier and front bumper, A-Z rockers, AA SYE, Tom Woods DS, JKS Rear UCA's.
Quote:
Originally Posted by KKiowaTJ
Sorry master, Dont whips me, I's do betta next time..
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post #7 of Old 06-07-2013, 09:49 AM
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Originally Posted by jmreagan View Post
Thank you BoogieMan, JBTJ, and Jerry. I appreciate your fast responses and for taking the time to explain why I need the APP985's...
Or better yet the XP985 Iridium tip plugs.
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post #8 of Old 06-07-2013, 09:53 AM Thread Starter
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Originally Posted by JBTJ View Post
Or better yet the XP985 Iridium tip plugs.
I might try those for my next set JB. I just ordered (6) APP985's to my favorite parts store. I know on my wife's V8 4Runner I'll only use Denso Iridium's for that particular engine. They last about 100K...

03' Sport, 4.0L, 3.73, 5 speed, D44/D30, 3 inch coil/shock lift, RE track bar, Tera disco's, 35x12.50's Dunlap Mud Rovers MT's, Spidertrax spacers, Viper 5000 alarm, Tuffy console, LOD extreme bumper/tire carrier and front bumper, A-Z rockers, AA SYE, Tom Woods DS, JKS Rear UCA's.
Quote:
Originally Posted by KKiowaTJ
Sorry master, Dont whips me, I's do betta next time..
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post #9 of Old 06-07-2013, 09:59 AM
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Originally Posted by jmreagan View Post
I might try those for my next set JB. I just ordered (6) APP985's to my favorite parts store. I know on my wife's V8 4Runner I'll only use Denso Iridium's for that particular engine. They last about 100K...
I had just over 80k on mine when I pulled them out for inspection. I could not detect any sign of wear what so ever. I'm going to wait for another 100k to inspect unless I have a reason to do sooner.
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post #10 of Old 06-07-2013, 10:21 AM
jeepinhokie
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FYI Autolite has a rebate going…


http://www.autolite.com/enmx/node/1124

1.50 off APPs
2.00 off XPs
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post #11 of Old 06-07-2013, 11:06 AM
TheBoogieman
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Advance auto and Autolite both have a rebate.Save $3 on each plug for the Autolite Iridium plugs.($1 instant/$2 mail-in)
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post #12 of Old 06-07-2013, 11:12 AM
Jeepster83
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I change more autolite crap plugs than any other kind of plug. Get the NGK or Champion douple platinum plugs. I drank the kool-aid on the autolite plugs a while back and I threw them away in short order. Misfires and lack of power and lean condition codes. I swapped in some Champion's and all the problems went away. What Jerry said about the double or single platinum is correct, I just disagree whole-heartedly on the brand. You'll end up paying a little more for the MUCH better NGK/Champion/ACDelco plugs but it's more than worth it in my opinion.

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post #13 of Old 06-07-2013, 11:20 AM
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I've had better luck with the Champion double plat's than with the APP's.

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post #14 of Old 06-07-2013, 11:30 AM
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Quote:
Originally Posted by imped
i've had better luck with the champion double plat's than with the app's.
x2

01 tj 4.0,bds springs,ROKMEN arms, ecgs 8.8 and hp30 both locked with 4.88s,35in STTs,Smittybilt bumpers,8k winch,hylined MCE flatties,TKHfab rocksliders,and lots more to come!
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post #15 of Old 06-07-2013, 11:55 AM
TheBoogieman
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Quote:
Originally Posted by Jeepster83 View Post
I change more autolite crap plugs than any other kind of plug. Get the NGK or Champion douple platinum plugs. I drank the kool-aid on the autolite plugs a while back and I threw them away in short order. Misfires and lack of power and lean condition codes. I swapped in some Champion's and all the problems went away. What Jerry said about the double or single platinum is correct, I just disagree whole-heartedly on the brand. You'll end up paying a little more for the MUCH better NGK/Champion/ACDelco plugs but it's more than worth it in my opinion.
Eight Jeeps so far with Autolites and never had a problem with any of them.You must have got the defective ones.
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