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Topic Review (Newest First)
02-20-2012 09:25 AM
Jerry Bransford
Quote:
Originally Posted by jgorm View Post
Why is there a difference on plugs if you have a distributor or not?
Because newer DIS (distributorless ignition system) ignitions require both sides of the gap be made from the same material due to how they fire the plugs. The APP-985 and 7034 have platinum on both sides of the gap, AP-985 and 3034 only have it on one side of the gap. Installing the AP-985, 3034, or similar technology plugs into newer DIS equipped 4.0L engines will eventually cause misfiring or other hard to diagnose engine idle/run problems.

Jeep issued a TSB about that particular problem to alert their techs to remove that type of plug when that problem is encountered. DIS engines can only run conventional, double-tipped platinums like the APP-985 or 7034, or iridium like the Autolite XP-785. The only type of plug DIS engines don't run well with are single-tipped plugs like the AP985 and 3034.

Older style distributor-equipped engines can run either/any type plug without problem. It's just that the APP-985 and 7034 plugs cost more without any benefit for the older non-DIS style engines.
02-20-2012 09:18 AM
jgorm
Quote:
Originally Posted by Jerry Bransford View Post
Autolite's AP985 or Champion's 3034 single-tipped platinum (platinum on just one side of the gap) is the best choice for yours since yours has a distributor. The more expensive APP985 and Champion 7034 (double-tipped, platinum on both sides of the gap) is only needed for newer distributorless 4.0L engines and there would be zero benefit to running the APP985 in yours.
Why is there a difference on plugs if you have a distributor or not?

my opinion is that platinum stuff came into the mix to provide 100,000 mile service on a single set of plugs. If you change the plugs more, you can run cheap copper plugs.
02-20-2012 12:04 AM
Jeepzjlover Why not bring iridium into this mix?
02-19-2012 06:02 PM
Jerry Bransford
Quote:
Originally Posted by The Yinnies View Post
I am sorry. It is a 2000 Sport with a 2.5 and auto.
Thanks
Autolite's AP985 or Champion's 3034 single-tipped platinum (platinum on just one side of the gap) is the best choice for yours since yours has a distributor. The more expensive APP985 and Champion 7034 (double-tipped, platinum on both sides of the gap) is only needed for newer distributorless 4.0L engines and there would be zero benefit to running the APP985 in yours.
02-19-2012 02:36 PM
TJDave Oh. I believe the APP985 is a newer 4.0 I6 thing.

From what I have read, you should be fine with the other.

DISCLAIMER: This is only what I have read. I have no personal experience with the 4 banger.

Someone else will hopefully offer up some better advise.
02-19-2012 02:21 PM
The Yinnies I am sorry. It is a 2000 Sport with a 2.5 and auto.
Thanks
02-19-2012 02:09 PM
TJDave Depending on the year of your TJ.....Yes. My '04 runs best on the APP985's.

Distributor-less ign.
02-19-2012 02:05 PM
The Yinnies
AP985 or APP985?

Is there any reason to go to the APP?
Thanks

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