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Old 05-04-2013, 04:51 PM   #61
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Yes but if you are going to figure MPG then empty tank, fill with 19 not 16 gallons and do the math. If I throw 16 in and not know what is in the tank then how can I give a accurate MPH??????? Going by the pump turning off???
If you are off by 3gallons then it can be anywhere from 30 to 60MPg..
That's not how it works bro...you don't need to be on empty or anything like that. Fill the tank (be consistent, if you top it off or stop on the click do the same on the next fill) and write down the miles on the odo or reset the trip. The next time you fill up (as long as you fill up it doesn't matter how low the tank is) divide miles traveled by the gallons you just put in. You're way over thinking the situation and confusing yourself.

So if you traveled 250 miles since your last fill and just filled the tank with 16.5 gallons you average 15.15 MPG.

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Old 05-04-2013, 05:44 PM   #62
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Just change my plugs and reset adaptive memory and saw a 4mpg change. Up to 20 mpg. That is just after driving100 miles.

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Old 05-04-2013, 06:27 PM   #63
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Just change my plugs and reset adaptive memory and saw a 4mpg change. Up to 20 mpg. That is just after driving100 miles.
Careful, alot of ppl on this forum tend to openly ridicule a member when someone says they get 20mpg.
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Old 05-04-2013, 06:57 PM   #64
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Careful, alot of ppl on this forum tend to openly ridicule a member when someone says they get 20mpg.
I've got big shoulders. I am going to do my father in laws next. He is current getting 17.
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Old 05-04-2013, 08:40 PM   #65
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Yup those NGK plugs are hot.

Like, Jenny McCarthy hot. Not Lindsay Lohan hot.
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Old 05-04-2013, 08:47 PM   #66
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Wow Jenny McCarthy..haven't heard that name in a long time. Whoaa yea I just googled her she's still got it.
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Old 05-04-2013, 08:53 PM   #67
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Wow Jenny McCarthy..haven't heard that name in a long time. Whoaa yea I just googled her she's still got it.
Yeah, and how did a dorky lookin dweeb like Jim Carrey end up with that, lol
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Old 05-05-2013, 10:51 AM   #68
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Cool

Money, honey.
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Old 05-05-2013, 10:58 AM   #69
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Money, honey.
Get the rancho's put on??
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Old 05-05-2013, 11:16 AM   #70
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I do big guy I do what a fantastic new product from rancho (7000 mt) jeep rides great. Just changed my plugs as well yesterday used the champion platinums. Also the soft top went on yesterday as it hit 28 degrees centigrade here in the lower mainland of BC.
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Old 05-05-2013, 01:33 PM   #71
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I do big guy I do what a fantastic new product from rancho (7000 mt) jeep rides great. Just changed my plugs as well yesterday used the champion platinums. Also the soft top went on yesterday as it hit 28 degrees centigrade here in the lower mainland of BC.
You should of went with the NGK's bro... They react way better for our type of rigs... I had champs in mine but last week I switched and even getting abit better millage. I'm putting the soft top on this month IF the weather over here doesn't crap out on me Making a custom cab cover first before the soft top just to be cautious...
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Old 05-05-2013, 04:43 PM   #72
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You should of went with the NGK's bro... They react way better for our type of rigs...

React way better than what? Single platinum Champions? Probably. Double platinum Champions? Not in my experience.
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Old 05-05-2013, 04:44 PM   #73
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react way better than what? Single platinum champions? Probably. Double platinum champions? Not in my experience.
x2.
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Old 05-05-2013, 05:18 PM   #74
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react way better than what? Single platinum champions? Probably. Double platinum champions? Not in my experience.
(sigh)...
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Old 05-05-2013, 08:08 PM   #75
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(sigh)...

(yawn)...
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Old 05-05-2013, 10:09 PM   #76
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(yawn)...
(burp)
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Old 05-05-2013, 10:17 PM   #77
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(burp)
FART!

Woohoo, gained an extra 5 mpg!
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Old 05-05-2013, 10:47 PM   #78
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FART!

Woohoo, gained an extra 5 mpg!
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Old 05-06-2013, 10:08 AM   #79
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Just change my plugs and reset adaptive memory and saw a 4mpg change. Up to 20 mpg. That is just after driving100 miles.
Stupid question here, what's "adaptive memory?" IDK what that is or how to reset it...
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Old 05-06-2013, 10:14 AM   #80
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Interestingly enough after reading this thread I thought I would look into the NGK's and advanced auto parts is telling me that it won't fit my 2.5L 99 TJ. Is this right or am I just doing something wrong? Or is their website incorrect?
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Old 05-06-2013, 10:36 AM   #81
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Interestingly enough after reading this thread I thought I would look into the NGK's and advanced auto parts is telling me that it won't fit my 2.5L 99 TJ. Is this right or am I just doing something wrong? Or is their website incorrect?
Their website is not correct. Ngk/Ntk are the oem plugs if i recall.
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Old 05-06-2013, 11:03 AM   #82
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Stupid question here, what's "adaptive memory?" IDK what that is or how to reset it...
It is flashing the computer. Basically erasing the memory. Then it will run off a factory set of parameters while it relearns your driving habits.
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Old 05-06-2013, 11:06 AM   #83
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You don't need to flash the computer to erase the adaptive memory. You can either touch the battery connectors together with the head lights on to completely drain the capacitors that store a charge which keep the adaptive memory alive for a period of time, or just leave the battery disconnected for an extended period of time.
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Old 05-06-2013, 11:54 AM   #84
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Does this actually accomplish anything?
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Old 05-06-2013, 11:56 AM   #85
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Does this actually accomplish anything?
Sometimes it can be useful but not normally. I have never needed to do it to fix anything for either of my two TJs over the past 17 years.
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Old 05-06-2013, 03:26 PM   #86
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Interestingly enough after reading this thread I thought I would look into the NGK's and advanced auto parts is telling me that it won't fit my 2.5L 99 TJ. Is this right or am I just doing something wrong? Or is their website incorrect?
THe NGK sparkplugs i quoted in the first post are stock ones for 00 to 06 4.0L engines or 01 to 06 can't remember off the top of my head. Look at the white emmissions sticker under your hood for the type your engine takes for stock. I think they will be champin's are stock for your model. They should be able to find the NGK version for your 2.5L they are the V power model.
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Old 05-06-2013, 03:32 PM   #87
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Does this actually accomplish anything?
What do you have to loose give it a try. its free and could help.
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Old 05-06-2013, 03:33 PM   #88
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THe NGK sparkplugs i quoted in the first post are stock ones for 00 to 06 4.0L engines or 01 to 06 can't remember off the top of my head. Look at the white emmissions sticker under your hood for the type your engine takes for stock. I think they will be champin's are stock for your model.
Awesome... with all the wonderful things that everyone has been saying about champion going downhill in qc, I will look at something else. Does anyone have time to educate and idiot on spark plug types and how they differ? I know what they do, but that's about it.
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Old 05-06-2013, 03:45 PM   #89
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Awesome... with all the wonderful things that everyone has been saying about champion going downhill in qc, I will look at something else. Does anyone have time to educate and idiot on spark plug types and how they differ? I know what they do, but that's about it.
I don't agree that "everyone" is saying Champion's quality is going downhill.

I have a good handle on spark plug technology & what works well in a TJ. For your distributor-equipped '99 which isn't as fussy about spark plug technology like 2000 and newer distributorless 4.0L engines are, these three spark plugs will work fine: The first two, Champion 3034 or Autolite AP985 will perform well for 100k miles. Both of those are platinum-tipped. Autolite's latest iridium-tipped XP985 should perform well for 200k miles.
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Old 05-06-2013, 05:55 PM   #90
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I have a '99. I bought champion 3034 plugs, made in USA right on the box, 4k (ish) miles, zero issues. I've done maybe 20 miles on the freeway on my jeep so I don't have mileage for that, mpg on surface streets in traffic with a heavyish right foot: 12.5 consistently over time.

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