WK 5.7 misfire and flattened spark plugs! HELP! - JeepForum.com
 
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post #1 of 11 Old 07-20-2015, 08:40 AM Thread Starter
Jessetheflip
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WK 5.7 misfire and flattened spark plugs! HELP!

So 2 days ago my WK decided to code and my superchips told me it was a p0307 cylinder 7 misfire. The next morning brought her to a local shop to have the oil changed (over due) and to install new spark plugs (also WAY over due) was told I needed a 1 new coil pack, but then was told never mind it was fine. The condition of the spark plugs were horrendous. One of the spark plugs from the misfiring cylinder had its ground electrode completely flattened to the center electrode. ( try to post a pic ) The replaced all the spark plugs, the jeep was good as new, no problems. Then last night while driving a little heavy footed I felt a buck, then I knew something was wrong again. Brought it home, and now the jeep has a misfire in cylinder , but was wondering if anyone experienced anything like this? Any advice would be greatly appreciated!! Cheers

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post #2 of 11 Old 07-20-2015, 08:41 AM Thread Starter
Jessetheflip
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Just got back from the shop, cylinder 1 has flattened spark plugs now. Also my battery was completely drained dead, shop said the battery was shot... Any chance this could be a gapping and new battery issue combined??
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post #3 of 11 Old 07-20-2015, 09:56 AM
caulk04
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I wonder if you've got a knock problem that's beating the plugs up...

What plug has been installed? Any other issues with driveability or mileage?

08 Limited Hemi - wheels, tires, springs...ya know, stuff
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post #4 of 11 Old 07-21-2015, 07:33 AM
Tekn0logy
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If the center electrode is worn away or "flattened" then I would think the plugs were just probably years well past replacement schedule. If the ground electrode & center electrode were flattened, I would suspect either the wrong plugs or a spent bearing. But a spent bearing would have a very noticeable knocking sound and the wrong plug would have been noticed day one. Do the plugs look like something physically hammered on them or do they look burned away? Pics?
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post #5 of 11 Old 07-21-2015, 11:28 AM
cobra259
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What brand of spark plugs were used?

2006 GC Limited 5.7 Hemi Stone White BT c/can Mopar cold air
1995 Cobra Mustang Procharged
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post #6 of 11 Old 07-30-2015, 09:57 AM Thread Starter
Jessetheflip
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Thank you all for your responses! I had the plugs regapped and a brand new battery put in, and she ran great without a hiccup...until someone rolled through a stop sign and I T-boned them

Champion 570's were used ( I always try to follow the OEM recommendation )

Whenever I get my baby back from the shop, I will hopefully be able to test her out a little more and see if any other issues come up

Cheers
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post #7 of 11 Old 07-30-2015, 07:08 PM
Jeep Brian
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Ouch, that sucks! Glad she ran better!

Mine: 07 GC Limited Hemi stock for now.

Hers: 14 Dodge Durango Citadel Hemi

68 Firebird 350 4 spd #'s matching
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post #8 of 11 Old 08-02-2015, 04:01 AM
Blown7
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If your spark plug gaps were closed you broke a piston.
Time for a borescope and if the pistons ring land is broken..engine tear down time.

If they look like this you got big problems



Do you have a tune on the engine?

The Dunning–Kruger effect is a cognitive bias in which unskilled people make poor decisions and reach erroneous conclusions, but their incompetence denies them the meta-cognitive ability to realize their mistakes.
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post #9 of 11 Old 08-03-2015, 01:20 PM Thread Starter
Jessetheflip
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One of the spark plugs looked like that originally (cylinder 7) then after I had new spark plugs put in cylinder 1 did it....yes I have a superchips tune. 91 octane tune with the MDS shut off and tires set to 31"
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post #10 of 11 Old 08-03-2015, 01:21 PM Thread Starter
Jessetheflip
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Replied above!

Quote:
Originally Posted by Blown7 View Post
If your spark plug gaps were closed you broke a piston.
Time for a borescope and if the pistons ring land is broken..engine tear down time.

If they look like this you got big problems



Do you have a tune on the engine?
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post #11 of 11 Old 08-03-2015, 01:24 PM Thread Starter
Jessetheflip
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Posts: 47
Quote:
Originally Posted by Blown7 View Post
If your spark plug gaps were closed you broke a piston.
Time for a borescope and if the pistons ring land is broken..engine tear down time.

If they look like this you got big problems



Do you have a tune on the engine?

Both misfired happened when I was getting on it hard on the highway...
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