anyone got vibaration when cold start?

[klst123]

my 3.6 JT has vibration after cold start .and Jscan catch misfires from #2,4,6 cylinders. no vibration when engine is hot.
anyone have same problem here?

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[Lunentucker]

That's the right hand side, which is usually not the side with the cam roller issues.

 

[Lunentucker]

Age?
Mileage?
Modifications?

 

[klst123]

That's the right hand side, which is usually not the side with the cam roller issues.

u mean driver side? does passenger side most get cam roller issues?

 

[klst123]

Age?
Mileage?
Modifications?

2020 JT
11,184 M
stock.

 

[ShadowsPapa]

That's the right hand side, which is usually not the side with the cam roller issues.

That's bank 2 - driver side on USA JTs.

my 3.6 JT has vibration after cold start .and Jscan catch misfires from #2,4,6 cylinders. no vibration when engine is hot.
anyone have same problem here?

There are SO many threads and hundreds of posts on misfires - some when cold, some when hot.
I'd suggest do a search for them as there are as many fixes as there are engines with a misfire.

In short, yes, several have had that same issue and have discussed it, even to the point of what THEIR solution or fix was.

You don't say what year it is, how many miles are on it, did you buy it new, did you take it to a dealer for diagnosis and FIX?
There are fixes out there if you are in warranty, they'll be FREE.

 

[ShadowsPapa]

They're on passengers side. Usually it's the driver's side that has the issues due whatever reason.

Bank 1, right side - 1, 3 and 5 had the cam and follower issues.

 

[klst123]

That's bank 2 - driver side on USA JTs.


There are SO many threads and hundreds of posts on misfires - some when cold, some when hot.
I'd suggest do a search for them as there are as many fixes as there are engines with a misfire.

In short, yes, several have had that same issue and have discussed it, even to the point of what THEIR solution or fix was.

You don't say what year it is, how many miles are on it, did you buy it new, did you take it to a dealer for diagnosis and FIX?
There are fixes out there if you are in warranty, they'll be FREE.

im in warranty but u know , service center always says it's 'normal' ill visit in next week anyway

 

[ShadowsPapa]

u mean driver side? does passenger side most get cam roller issues?

Yes, right bank (passenger side), cylinders 1, 3 and 5, typically had the cam issues.

Oddly, non-cam related misfires are often the left bank, bank 2, with cylinders 2, 4 and 6.
In my case it was a HOT start misfire, and it was 2 as the worst, followed by 4, and then by 6 with the least but still more than any right bank cylinder (1, 3 or 5)


1, 3 and 5 are right or passenger side (USA) and that's the side that had the most cam issues.
2, 4 and 6 are driver side (USA) left side - and seems to be showing up with misfires now and then.
If you have misfires, why not go to the dealer??? It's got warranty and there are a number of misfire service bulletins and fixes.
Anything else will be a guess, people on forums throwing stuff at the wall to see what sticks.
Can be anything from the PCM needing a flash to spark plugs to a few other things.

 

[Lunentucker]

Bank 1, right side - 1, 3 and 5 had the cam and follower issues.

I knew it was 1, 3, 5.
Not sure how I had the sides wrong all this time.

 

[klst123]

Yes, right bank (passenger side), cylinders 1, 3 and 5, typically had the cam issues.

Oddly, non-cam related misfires are often the left bank, bank 2, with cylinders 2, 4 and 6.
In my case it was a HOT start misfire, and it was 2 as the worst, followed by 4, and then by 6 with the least but still more than any right bank cylinder (1, 3 or 5)


1, 3 and 5 are right or passenger side (USA) and that's the side that had the most cam issues.
2, 4 and 6 are driver side (USA) left side - and seems to be showing up with misfires now and then.
If you have misfires, why not go to the dealer??? It's got warranty and there are a number of misfire service bulletins and fixes.
Anything else will be a guess, people on forums throwing stuff at the wall to see what sticks.
Can be anything from the PCM needing a flash to spark plugs to a few other things.

Because i thought small amounts of misfire count is normal. this pic is right after cold start. it's almost under 10 misfires so ..

 

[Lunentucker]

im in warranty but u know , service center always says it's 'normal' ill visit in next week anyway

Yeah, unless you get and keep a code they're likely not going to be very interested.

 

[klst123]

Yeah, unless you get and keep a code they're likely not going to be very interested.

that's what im saying. jeep services usually sucks.

 

[Lunentucker]

How cold is your ambient temp when starting?
I assume it just started doing this?

 

[Lunentucker]

Also, there have been a couple of computer updates on these.
The first was Z37 and then there was another one after that.
Have you had those performed?

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