Rough idle in drive/reverse

Discussion in 'Renegade Chat' started by Eoseitz, Apr 9, 2020.

  1. Eoseitz

    Eoseitz Active Member

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    Thanks @idomyownracing. I’m assuming it’s safe to support the motor by the transmission when doing the drivers side? Using a wood block
     
  2. Eoseitz

    Eoseitz Active Member

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    Got the drivers side in. Anybody know the torque specs. I had them for the passenger side, but can’t find them now.
     
  3. Eoseitz

    Eoseitz Active Member

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    Torque specs attached.
     

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  4. Eoseitz

    Eoseitz Active Member

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    Hmmm. I think it’s vibrating more now that I changed the drivers side. ‍♂️
     
  5. IDoMy0wnRacing

    IDoMy0wnRacing Well-Known Member

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    Yep, I did.
     
  6. Eoseitz

    Eoseitz Active Member

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    Do you have to move the exhaust pipe to get the rear mount loose? I’m not seeing anyway to fit a bit on there otherwise. The ratchet won’t clear the exhaust hanger. Ugh. I know I’m going to break the studs if I have to take it off. Lol.
     
  7. Eoseitz

    Eoseitz Active Member

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    I made a quick video showing a broad overview of how to change the drivers side motor mount. I haven’t found any other videos online about it.

     
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  8. zuke

    zuke Active Member

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    sorry, I haven't had much of a chance to post lately, Did you ever get the rear mount changed?
     
  9. Eoseitz

    Eoseitz Active Member

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    Not yet. I was hoping to do it this weekend. I started to do it last weekend, but the exhaust hanger was hitting my ratchet. I was afraid I’d break the studs on the exhaust if I remove it, so I did the drivers side mount first. Thought I should figure things out before I started removing things. Lol.
     
    Last edited: Sep 11, 2020
  10. Eoseitz

    Eoseitz Active Member

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    So this is interesting. I did t really think about it until now. My vibration issues started not long after the fan recall. Then I read this. Could it have anything to do with the fan? I rumbles more after the vehicle heats up. That would make sense if the fan is kicking on.

    https://static.nhtsa.gov/odi/tsbs/2015/MC-10151744-9999.pdf
     
  11. zuke

    zuke Active Member

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    Wow, That is bizarre!

    Suppose it is possible it could be something like that, It certainly would have never occurred to me! The illustrations in the PDF don't appear to be a Trailhawk, and it's only for 2015 vehicles, so i'm not sure the aluminum tape solution would work if that is the source of your vibration, but you could definitely look around the radiator for any contact other than the rubber isolators.

    You could also just idle it, and touch the radiator to see if you feel the vibration there, which would actually help in narrowing it down alot.
     
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  12. Eoseitz

    Eoseitz Active Member

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    How do I remove the clamp from the throttle body? I don’t really want to break this one. It looks like there might be a way to unscrew it, but I can’t figure out how.

    I figured while I’m checking things out, I might as well clean the throttle body. The pcv valve hose had quite a bit of oil in it and I see a lot of oil buildup in the intake hose/air filter box.

    I’ll probably just break the clamp holding the hose onto the filter box. I’d rather have a screw on type that I can easily remove on that side.
     
  13. IDoMy0wnRacing

    IDoMy0wnRacing Well-Known Member

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    As I recall, it is a normal hose clamp requiring a 7mm socket.
     
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  14. Eoseitz

    Eoseitz Active Member

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    Thanks for the reply. I’ll double check tomorrow. It didn’t look like it had a bolt in the clamp. It almost looked like a lever type thing on the side of the clamp to me. I’ll try to take a picture. There’s not a whole lot of room to get a phone in there.
     
  15. Eoseitz

    Eoseitz Active Member

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    You were right again @IDoMy0wnRacing after I checked, what looked like a lever was a 7mm bolt to adjust the clamp. It was an odd looking design. I was expecting the typical bolt/screw driver type.
     
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  16. Eoseitz

    Eoseitz Active Member

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    A picture of the clamp bolt.
     

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  17. zuke

    zuke Active Member

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    This is why I'm so glad Ed has been sticking around here!
     
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  18. DangerToaster

    DangerToaster New Member

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    I am curious about a resolution on this. I recently installed the Avid Budget 1.5” lift with the Eibach springs on my 2018 TH about a week ago, so roughly 2.5” overall. Now I have vibration at idle when in gear. It is nothing severe, usually very slight where I mostly feel it through the brake pedal. At it’s worst it might be a little more intense with a more audible hum. As soon as my foot is off the brake everything is smooth. It’s a 2018 so it shouldn’t be motor mounts since I should have the redesigned ones. Any input would be appreciated. TIA.
     
  19. zuke

    zuke Active Member

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    Since it's at Idle, that pretty much rules out any rotational issues, I'd look hard for something that wasn't touching before that is now touching that could be transmitting the vibration...

    Likely candidates for that are the driveshaft, exhaust (especially the exhaust!), front axle shafts and rear subframe. If any of these included spacers to drop them, those are all good places to look for contact that wasn't there before the lift. An often missed trouble spot for this is the rear muffler and intermediate pipes, If you moved the muffler back as some lift kits advise, it can end up touching the rear valance, If you didn't move it back, the intermediate pipes can end up touching the rear arms where it passes under them.
     
  20. TWX

    TWX Active Member

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    Wife's 15 TH has some pretty significant rattles at around 43,000 miles. I'm probably going to clamp some weights on the exhaust and see what changes. I'm wondering if the design of that front flex joint of the exhaust is less than ideal.
     

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