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moparjunky 05-20-2013 05:49 PM

what a diffence!!!!
When I first bought my jeep about a month ago, my gas mileage was horrible. Looking online it said I should be getting somewhere around 18mpg but I was getting 15 at best. I pulled the spark plugs and they looked like they had never been changed. The electrodes were burnt down to almost nothing. I replaced them and just for s&g's I replaced the cap and rotor too. The last 2 tanks have both come in at 19 and 20 mpg. Big difference. I'm gonna go over the rest of the engine because if the PO neglected something as easy as spark plugs, who knows what else needs to be replaced.

01tj-Bob 05-20-2013 06:03 PM

If the plugs were that bad just think what the Tranny and Dif fluids must look like. Time to get busy!

sinbob 05-20-2013 06:07 PM

Yeah mine were the same I changed everything and I do mean everything up to and including the brake fluid....used royal purple in everything except the motor and radiator....lolol

Cap and rotor ???? Whats that???? lololol

thgr8alex 05-21-2013 12:49 AM

Hmm.. I get about 16 but thats to be expected with 5 in lift and 33x12.5s. But i wonder if it would get better with new plugs...
What lift and tires are you running OP?

KillerKustums 05-21-2013 07:05 AM

It's crazy to see just how bad a jeep can be neglected......

moparjunky 05-21-2013 07:32 AM

No lift. 235/75 15s. Stock as a rock as far as I can tell.

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