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  1. #1
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    Default E3 Spark Plugs and the Jeep 4.0L

    I was watching "Gearz" today with Stacey David. They were giving 6 tips to improving your fuel economy. One was using the E3 spark plugs to improve the spark and burn more of the fuel in the cylinder.

    I know the conventional wisdom is that you use the cheap a Champion spark plugs for the best performance. Has anyone used the E3 in the 4.0L Jeep? If so what year model, and what were your results? You may not know the mpg so just mention how it ran, how long before you had to change the E3 spark plugs, and did you go back with the E3 spark plugs.

  2. #2
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    yes ran them with good results. Regret changing them, i will go back next time. I do wonder if E3 was a sponsor (Sorry if my bitterness show through)
    [SIZE="2"]97 XJ SPORT
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  3. #3
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    Quote Originally Posted by Ruinator View Post
    yes ran them with good results. Regret changing them, i will go back next time. I do wonder if E3 was a sponsor (Sorry if my bitterness show through)
    No I think the same way as you. The 6 things they listed on the show were...

    1. Open up the air flow. K&N (which is a sponsor) was the recommended one.
    2. E3 spark plugs
    3. Syntethic fluids. Motor, transmission, diff, etc...
    4. Reprogramming the ECU, several brands were mentioned.
    5. Exhaust including high flow catalytic converter(s)
    6. Headers!

    I may give the E3's a try then. I'm going to see if/how much the injector swap helps the MPG then I may try the E3 next. I've wanted to do the reprogramming of the ECU for a while now, but the price was a hard sell for me.

  4. #4
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    I tried them a couple years ago and thought it made the Jeep a slow start in cold/damp weather. Went back to the Champions for the cure.
    Hey bubba get your hand off my ass,

    Some days it is just not worth it to gnaw through the leather restraints.

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  5. #5
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    Ya Champions are excellent. Man I got some Bosch that were on sale, they didn't make 30 miles. Those suck! Champion VS E3? Big debate
    [SIZE="2"]97 XJ SPORT
    3" Budget lift (ZJ coils and track bar, spacers shackles)
    MSD ignition (box, coil) Accel 6mm wires
    Ford 19# injectors, 60mm TB, turbo city air tube
    Cherry bomb cat back
    oversized battery,

  6. #6
    wv jeeper Guest

    Default Re: E3 Spark Plugs and the Jeep 4.0L

    I have always run bosch plugs and they work great? Just took the champions out of my new motor and put the Bosch plugs in it that survived the thrown rod in the old motor.

  7. #7
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    I can't speak to the 4.0 because I don't have one. But I have tried them in my 4.3L Chevy. I don't like them as well as the Bosh +4 plugs. the E3s had a rougher idle, though not really all that rough, and didn't have as much power in the seat.
    230 hp 4.3L Chevy
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  8. #8
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    Ok digging around I found a XJ mpg write up where one of the items they installed was the "Performance Distributors Firepower Ignition kit"



    175 from 4wd.com.

    They used the Bosch Platinum 2 plugs with dual tips in their test.

    You can read the test results yourself here

  9. #9
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    my step dad put the in my moms yukon and they are gettin 5 mpg's better!!!! his brother in law put them in his denali and is getting 4.5 better. I am thinkin about trying them.

    go buy some adn test em for us mud!!!

  10. #10
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    Quote Originally Posted by kmanxj View Post
    my step dad put the in my moms yukon and they are gettin 5 mpg's better!!!! his brother in law put them in his denali and is getting 4.5 better. I am thinkin about trying them.

    go buy some adn test em for us mud!!!
    Well after that XJ mpg write up I am to. I think I'm going to check with xjtalk vendors first, as I'd rather buy from them.

  11. #11
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    muddeprived is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: E3 Spark Plugs and the Jeep 4.0L

    I put e-3's in my TJ and it didn't run right (2.5L) so I held on to them and stuck in my xj when I first bought it cuz the stock plugs had a 1-mile gap! The jeep would get the feeling of misfiring while driving. The rpms would act funny, like it wasn't getting enough fuel or something. It was strange. I ended up switching out the plugs for champions again and it ran fine.

    I guess my jeeps don't like the new high tech crap lol.
    "Our Father;
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    And forgive us our trespasses,
    As we forgive those who trespass on us.

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