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Old 09-24-2014, 09:49 AM
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My Jeep: 2005 5.7L WK
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Exclamation WK Hemi - "fishbite"/shudder issues...

Hey everyone, I've had this issue for almost a year now, and no one (including mechanics) can figure out what the issue is. I've been doing research online, and it seems MANY WK owners have had this exact issue.

The issue is with vary degrees of shuddering/shaking in the 40-60 MPH range when lightly accelerating. Some people online have dubbed it "fishbite" because it has that shuddering back and forth feeling of a fish biting on a line. It intensifies going up a hill and it's apparent every single time I reach that MPH range. It's only mostly remedied if I depress the gas pedal enough to make it downshift, or if I manually downshift. Going into 3rd usually helps, but the MPG drop like a heavy weight, which isn't good on a car with already horrid MPG. Even in 3rd, I can still sometimes feel it.

I've changed the plugs, wires, and coils...which isn't a lot, but I've read so many horror stories of people going WAY beyond that and still experiencing the problem.

There are no codes hitting right now, but there were two codes previously hitting - one for the EGR and one for misfire cylinder 4. I know a few pretty knowledgeable mechanics, and they said it's unlikely the EGR would cause the issue. As for the misfire they said the most likely culprit would be the plugs, wires, or coils, which are now new.

I've read that disabling MDS has worked for a few people, but I don't have a programmer. I also read that putting it into Tow/Haul mode basically does the same thing as disabling MDS, so I tried that, and it actually does help slightly because it allows the RPMs to stay a little higher, but it was only very slightly better and still noticeable.

Anyone else have this issue, and if so, were you able to fix it???


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