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Old 07-07-2014, 09:56 AM   #1
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Are you gapping?

Guys, I was at the parts store checking out spark plugs for the Heep and while looking at the XP series of plugs I found they were running at or around .060.
So ...... do you very very carefully regap or let it ride like it is.
Instinct tells me to regap ...... very very carefully because they are easy to damage.
Anyone just screw them in? Or gap as you hold your breath?
For the just put them in folks ..... are things ok?

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Old 07-07-2014, 10:39 AM   #2
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I always check plugs, Too good of chance they may have been bumped in shipment and checking the gap is just too quick & easy when the plugs are out.

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Old 07-07-2014, 10:46 AM   #3
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always gap plugs, always.

btw, what XP plugs? I always run Autolite APP985
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Old 07-07-2014, 10:52 AM   #4
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XP 985 ..... iridiums.
I've had more than one person say that the tighter the gap the hotter the combustion temps run. That was my line of thought about the larger gap ...... cooler temp, good fire from iridiums and WAY longer life.
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Old 07-07-2014, 11:02 AM   #5
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Gap is different for different vehicles that use the same plugs. Why would you not re-gap them so that they match the requirements of your vehicle?
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Old 07-07-2014, 11:05 AM   #6
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Welp .... maybe I should be asking if anyone runs a different gap with the XP plugs other than whats recommended.
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Old 07-07-2014, 11:12 AM   #7
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If you have the 4.0L you really *need* to stick with the stock plugs. Anything else and the computer is unhappy. Stick with NTG or NTK (same company) and use the correct model number. Your engine and computer will be much happier. Upgrading spark plugs is not a good idea on this particular engine. Same with O2 sensors. And never use Bosch products for the O2 or the spark plugs.

I think (but am not sure) that there is an AC-Delco and a Champion model of spark plugs that work really well with the 4.0L on certain model years, perhaps the ones that still use a distributor. I am pretty certain about using the stock plugs for a 4.0L with the distributorless system.

Others here who know the whys and wherefores will chime in and explain it better. I am just the message boy, here. HAHAHA!!!

Good luck!
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Old 07-07-2014, 11:15 AM   #8
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The last time I tuned and changed plugs, I used NGK and measured each plug gap and surprisingly all 6 were within Jeep's .035 specification.
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Old 07-07-2014, 11:19 AM   #9
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Yeah, the NTKs seem to be assembled that way, or they gap them intentionally like that. I have only ever had to re-gap one NTK that was really off. The others I re-gapped, but, you know, in an OCD manner that probably made no difference at all, heh, heh, heh.

Whether you have to adjust the gap or not, you need to always check them, as they do vary. If they are gapped correctly then all the better...
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Old 07-07-2014, 11:44 AM   #10
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Stick with NTG or NTK (same company) and use the correct model number. Your engine and computer will be much happier.
Would you happen to have a link to these NTG or NTK spark plugs that you so highly recommend?
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Old 07-07-2014, 11:59 AM   #11
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Different gaps play different roles based on what you wish to achieve, but you need the ignition system to be able to support what you want to do. Unless you are really upgrading your ignition system, you are best to leave the plugs at the stock gap and to get the stock temperature range.

But as an FYI - the bigger the gap the more power and gas mileage to be had as it creates a longer / fuller burn.

The shorter the gap the less power to be made, but less voltage is needed to make that spark happen. Generally higher compression engines (aftermarket modded for instance) will run a smaller than factory gap so that they can properly ignite the denser a/f mixture.

The shorter the gap, the less likely the car is to misfire under heavy load at full throttle.

Again though, if you are stock, or not "internally modded" keep the stock gaps and as mentioned, always check to ensure that the plugs you bought are properly gapped.
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Old 07-07-2014, 04:44 PM   #12
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Welp .... maybe I should be asking if anyone runs a different gap with the XP plugs other than whats recommended.
We run the same plugs you are running in our 97 and 2000, 4.0 TJs. I'm running .045 gap on the 2000 and we bumped the 97 to .048 when we installed new plugs in it. The reason being, several years ago I replaced the plugs in the 2000. It still had the Champion copper core plugs and they were worn out. On several of them, the center electrode had eroded flush or near flush with the porcelain insulator. I installed the new plugs at .035 gap per spec but noticed that the Jeep didn't have the low end torque that it had with the old plugs and the gas mileage dropped off about 1 mpg. Drove it like that for a year and then took a job 42 miles from home and was having to fill up every 3 1/2 to 4 days. I decided to open the gap up, went to .045 and got the low end power back and the mpg came back up as well. Nursing it, I was getting 20 mpg on 32x11.50s at 55 with 3.07 gears. When we changed my son's, I went on to .048 as an experiment. It runs great so we haven't changed anything.
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Old 07-07-2014, 06:39 PM   #13
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Would you happen to have a link to these NTG or NTK spark plugs that you so highly recommend?
Your profile says you have an 03 (distributor less) In which case you want double platimum. There are several you can use. I have Champion. (Do a search on Jerry Bransford and spark plugs. He has posted the recommended ones many times)
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Old 07-07-2014, 06:58 PM   #14
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I always run Autolite APP985
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Your profile says you have an 03 (distributor less) In which case you want double platimum. There are several you can use. I have Champion. (Do a search on Jerry Bransford and spark plugs. He has posted the recommended ones many times)
thats where i got my recommendation a few years ago. great plugs for 00-06 tjs with a 4.0
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Old 07-07-2014, 08:15 PM   #15
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Autolite APP985 gapped to .035 are in mine. That was Jerry's recommendation a little over 20k miles ago.
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Old 07-07-2014, 08:42 PM   #16
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Welp .... maybe I should be asking if anyone runs a different gap with the XP plugs other than whats recommended.
Misquoted. I'm running Autolite AP 985 single platnium plugs in ours. Still like the open gap better in both the 2000 and 97. The 2000 has a coil rail, 97 has a distributor.
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Old 07-08-2014, 04:46 AM   #17
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The Heep a long is a ( early ) 2000. And the XP plugs will work just fine I'm sure.
It's just the gapping thing that I interested in exploring a little more.

At just over 100k plus I changed the upstream O2 sensors and was surprised how the Heep responded. IMO the best thing to do every 100k or so.
Smiles and miles to the gallon are a lot better and performance as it were is better ( seat of the pants dyno ).

So one Jeeper running .048 on APs. Do we have a .50 in the house?

( Still waiting for Jerry to check in )
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Old 07-08-2014, 06:15 PM   #18
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Stranger. I had saved one of the plugs I took out of 00 and just checked the gap. It was at .065. The Jeep was running good when I changed them but had almost 124K on it when we bought it and seems like it was around 140 or 145K when I changed the plugs. I just did it because I was unaware of the history of the plugs that were in the Jeep. My guess is, you could go .050 with no problem. If you don't like it, not that hard to bump them back down.
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Old 07-08-2014, 07:06 PM   #19
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The Heep a long is a ( early ) 2000. And the XP plugs will work just fine I'm sure.
It's just the gapping thing that I interested in exploring a little more.

At just over 100k plus I changed the upstream O2 sensors and was surprised how the Heep responded. IMO the best thing to do every 100k or so.
Smiles and miles to the gallon are a lot better and performance as it were is better ( seat of the pants dyno ).

So one Jeeper running .048 on APs. Do we have a .50 in the house?

( Still waiting for Jerry to check in )
for starters, a 2000 is a coil rail, right?

then you dont want ap 985 you want app985. and the gap should be set to .035. no need to try and reinvent the wheel. there is a reason the FSM has specs, its how the ignition was designed
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Old 07-09-2014, 05:00 AM   #20
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Stranger. I had saved one of the plugs I took out of 00 and just checked the gap. It was at .065. The Jeep was running good when I changed them but had almost 124K on it when we bought it and seems like it was around 140 or 145K when I changed the plugs. I just did it because I was unaware of the history of the plugs that were in the Jeep. My guess is, you could go .050 with no problem. If you don't like it, not that hard to bump them back down.

Thank you DoubleOught! ( What series plug are you talking/looking at )
AND we are talking about a Autolite 985 guys.
And all of the other posters too! Thanks for the info.
I get a decent discount on plugs and I'm considering the XP plugs. I like the "install them and forget them" for like almost ever again ideal.
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Old 07-09-2014, 06:41 AM   #21
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We are running the Autolite AP985 single platinum plugs. The ones in 00 have about 60 or 65K on them now. I have seen others say to run the APP985 double platinums, especially if you have the coil rail. Not sure what difference that would make. The XPs should be fine too. I'm really not a fan of Champion plugs because I have had mixed luck with them over the years, but must say that the copper core Champions that were in 00 from the factory were some outstanding plugs. It was an original Champion plug that had eroded to the .065 gap I referred to yesterday.
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Old 07-09-2014, 06:44 AM   #22
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heres a fun read, whats the difference between ap and app and what you should be running

AP985 or APP985?
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Old 07-09-2014, 06:53 AM   #23
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heres a fun read, whats the difference between ap and app and what you should be running

AP985 or APP985?
Thanks for the link. I've seen Jerry refer to this before but is the first time I've actually seen an explanation. Good information.
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Old 07-09-2014, 06:30 PM   #24
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I read the posts in the link and I think there is a typo error ........ it should be XP985 and not XP785. Everything I've found lists the XP985.


When they offer up the rebate again and with my discount I'll be going with six of them.
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Old 07-09-2014, 06:33 PM   #25
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We are running the Autolite AP985 single platinum plugs. The ones in 00 have about 60 or 65K on them now. I have seen others say to run the APP985 double platinums, especially if you have the coil rail. Not sure what difference that would make. The XPs should be fine too. I'm really not a fan of Champion plugs because I have had mixed luck with them over the years, but must say that the copper core Champions that were in 00 from the factory were some outstanding plugs. It was an original Champion plug that had eroded to the .065 gap I referred to yesterday.

And that is why I think I can go with a bigger gap
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Old 07-09-2014, 08:43 PM   #26
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yes, when ever I am around several beautiful girls in bikinis I am gapping,or is it gaping ? gasping ?, oh... wait.. your talking about something else.
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Old 07-10-2014, 04:38 AM   #27
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yes, when ever I am around several beautiful girls in bikinis I am gapping,or is it gaping ? gasping ?, oh... wait.. your talking about something else.

Now that's just plain ole funny ....... I don't care what the ya'll think!

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