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Old 11-27-2012, 01:01 PM   #1
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Spark plugs and gas mpg

I have a buddy with a yj we put new plugs in it and now his gas gauge is dropping alot quicker does this happen? I just bought new plugs for mine also his gas gauge was faulty to begin with it would be empty when it hit half a tank but since the new plugs its dropping faster

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Old 11-27-2012, 01:04 PM   #2
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Were the coils changed also? they are pretty cheap

prob need to do a full tune up aside w/ the sparks.

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Old 11-27-2012, 01:10 PM   #3
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If the correct model spark plugs were correctly installed, something else has caused the decrease in mpg.

Understand too that 2000 and newer 4.0L engines are fussy about the spark plugs they like to run well on. What did you install into your TJ and what year/engine type do you have?
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Old 11-27-2012, 01:53 PM   #4
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Quote:
Originally Posted by Jerry Bransford
If the correct model spark plugs were correctly installed, something else has caused the decrease in mpg.

Understand too that 2000 and newer 4.0L engines are fussy about the spark plugs they like to run well on. What did you install into your TJ and what year/engine type do you have?
I bought the app985s the ones you've mentioned to me before I have a 2003 4.0 I haven't installed them yet my buddies is a 93 4.0
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Old 11-27-2012, 02:07 PM   #5
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Good less $$$ plugs for your buddy's '93 4,0K would include the Autolite AP985 or Champion 3034. Either of those two single-tipped platinum plugs will perform well for 100K miles.
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Old 11-27-2012, 02:12 PM   #6
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Quote:
Originally Posted by Jerry Bransford
Good less $$$ plugs for your buddy's '93 4,0K would include the Autolite AP985 or Champion 3034. Either of those two single-tipped platinum plugs will perform well for 100K miles.
So I should be good with what I bought for mine
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Old 11-28-2012, 05:23 AM   #7
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This should be in the YJ forum. OE plugs is what I use in my TJ
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Old 11-28-2012, 05:29 AM   #8
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yea they'll work in yours, single or double platinum work well in the 4.0 but singles are a bit cheaper and run it just as well.

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