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E3 Spark Plug initial review for 92 XJ 4.0

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E3 Spark Plug initial review for 92 XJ 4.0

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Old 10-06-2018, 03:57 PM
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Default E3 Spark Plug initial review for 92 XJ 4.0

Saw these on rockauto for cheap and decided what the heck...model number was E3.58.

Replaced the champion plugs that were in yesterday. Initial impressions:

Cold start in 3 cranks, warm start in 1
Idle is just as smooth as before
Throttle response is slightly better, feels more eager to rev
WOT acceleration to 40 definitely better, consistent 0.3 second difference on the phone app.
Cruising rpm to maintain 35mph flat road is slightly higher by 50-100rpm

Based on my initial experience, I'd venture that the plugs make a little bit more torque, but a little bit less horsepower...I'll report back on any changes to MPG.
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Old 10-08-2018, 10:31 AM
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junk !! I installed them in a hemi dodge , after 1 week had misfire codes and stumble I could not figure since I just did a full tune up . ended up at the stealership for diag and found out the plugs wer garbage put a new set of ngk plugs in and all is well , I recommend staying away from gimmicks like these ,if they wer that good or made more power the factory would use them
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Old 10-08-2018, 12:06 PM
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Lee, you should post your pics of the ones from your 2.8...
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Old 10-08-2018, 02:00 PM
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From the research I did online they seem to work well for some, terrible for others. At $2 a plug I figured I'd be a Guinea pig. Maybe they have quality control inconsistency?
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Old 10-12-2018, 12:41 PM
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I have seen cases where the electrodes will fracture and break off!
Probably rare but still kind of concerning.

Next time just run NGK's. Made in USA or Japan, cheap, and great plugs.
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Old 10-14-2018, 02:01 PM
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Originally Posted by stateofstatic View Post
Saw these on rockauto for cheap and decided what the heck...model number was E3.58.

Replaced the champion plugs that were in yesterday. Initial impressions:

Cold start in 3 cranks, warm start in 1
Idle is just as smooth as before
Throttle response is slightly better, feels more eager to rev
WOT acceleration to 40 definitely better, consistent 0.3 second difference on the phone app.
Cruising rpm to maintain 35mph flat road is slightly higher by 50-100rpm

Based on my initial experience, I'd venture that the plugs make a little bit more torque, but a little bit less horsepower...I'll report back on any changes to MPG.
How long did you monitor performance with the Champions before the switch to E3? And how old were the Champions before the switch? You would get a better idea of just how much more the E3 actually give you.
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Old 10-17-2018, 02:09 AM
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Champions were put in at 90k (99k on odometer right now), all were gapped to 0.045. Previous mpg on those was 17.2 average over 3 tanks.

Just did my first full fill tonight with the E3s and I got 16.9mpg...we'll see after a few more fills if it hangs around this or not though I will say the entire tank was city driving where the other three tanks were a 80/20 mix of city/highway. More updates to come.
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