Rattle in any gear under approx 1000 rpm.

T.McD said:
that i got..:) i understand what your say.
but when you say "Pinging isn't just a noise, what's happening is the piston isn't able to move through the stroke at the same relative rate to match the expansion of the fuel mixture (compression ratio), as a result, this is excessively loading crank bearings, this term can also be known as "detination" ... this is the part of the post I would generally explain in technical detail what's going on, but being that the OP believes he can benifit without contribution I'll let him do the leg work"

is the noise in the crank bearings or being translated to somewhere else like the rockers etc.

i appreciate the help.
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http://lmgtfy.com/?q=Engine+Pinging

:thinking: :naw:
 
Real talk though, why the hell are you ever under load below 1000 rpm? The more I see this pop up, the stupider I realize it is.
 
swampdog said:
Real talk though, why the hell are you ever under load below 1000 rpm? The more I see this pop up, the stupider I realize it is.
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It is when starting off from a stop. Matching the rpm to the clutch speed and taking off smooth. No need to Rev the engine if not needed.
 
one side of me is hoping its a problemw ith your jeep and not your dirving
on the other hand having something out of wack with the jeep sucks but at least youre driving correctly...

if ide be closer ide just say, lets go for a drive so we can rule out user error once and for all.

not that im a pro or anything even close but my brother in law lives downtown ottawa, ill shoot you a PM next time i go see him,(at least once a month) unless you figure this out before then

p.s. i dont doubt youre driving correctly its just anoying me that that could be one of the answers to this mystery.
 
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christov11 said:
one side of me is hoping its a problemw ith your jeep and not your dirving
on the other hand having something out of wack with the jeep sucks but at least youre driving correctly...

if ide be closer ide just say, lets go for a drive so we can rule out user error once and for all.

not that im a pro or anything even close
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I agree, I've been driving a manual for over 25 years and driven with over sized tire and proper gearing and gearing that was not right. Just never had this rattle from under gearing before.
I was always taught to only give enough rpm to get the vehicle moving and not Rev it up.

Like pulling out the clutch till it starts to grab and then apply the gas. Makes for a smooth start.

So it's into the dealer today as I'm away on business for a couple of days, so I will see if they find anything. If not I need to adjust my driving style for this Jeep.
Will let you know.
Even with maybe not describing this properly I do appreciate the time you have taken to discuss it some.
 
to be honest i give it a little kick then while its winding down i let go of the clutch and when i feel it bite i get back on the gas.....

this all happens litterally within a split second and theres more muscle memory than anything else in finding the friction point and how much to give.

let us know man, im really curiouse
 
Lugging it up to speed is creating way more wear and tear on the engine than bringing the RPMs up smoothly and quickly as you accelerate off the line. No need to chirp the tires but a noticeable rise in the front end as you accelerate up to the second gear shift point is normal. Unless I am going to be stopping at a stop sign or light at the next intersection, my second gear shift point is anywhere between 2500-2800 RPM. As someone already mentioned, it's more muscle memory than anything conscious I do. I'd have to consciously watch to see exactly when each of my natural shift points are.
 
Hey byte, your right. It really depends on your style as in what we are all used to do. I drove yj and tj's for the last 20 some years all with the 4L engines and they were like shifting a truck in that the torque is there so low and tend to shift at low 2000 rpms. I guess I'm just not used to this v6 engine and where the power is.
I will definitely try to do some of things suggested and see. Like you said it is muscle memory as I don't look down much to see what I'm really shifting at until I noticed this.
 
T.McD said:
Hey byte, your right. It really depends on your style as in what we are all used to do. I drove yj and tj's for the last 20 some years all with the 4L engines and they were like shifting a truck in that the torque is there so low and tend to shift at low 2000 rpms. I guess I'm just not used to this v6 engine and where the power is.
I will definitely try to do some of things suggested and see. Like you said it is muscle memory as I don't look down much to see what I'm really shifting at until I noticed this.
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Yeah I noticed a big difference between the gearing in my 5 speed Tacoma and the 6 in my JK. When I first got the JKUR I was trying to shift at much too low RPMs. I just watched on the way home last night and again into work. That 1st gear shift point I mentioned was for the Tacoma. When I'm accelerating up to 45+ my 2nd gear shift point is just at 3000 RPM in the JKUR. Everything in the drive train is stock btw. I have noticed too while climbing the driveway into the garage slowly as the door opens that the JKUR doesn't like to go low RMPS in 1st gear 4 Hi. This engine really needs the RPMs to motivate it. I've gotten into the habit of letting the door open all the way before I even start up the slope. But in 4 Low, it'll idle all day without a hicup.

Sounds like you just need to get some more miles in this Jeep and you'll have the muscle memory adjustment down. I'm coming up on 9900 miles and I'll have had the JK 1 year on Sept 29th. Still learning things about it too.

Happy Jeepin'! :thumb:
 
Update, I just got the Jeep back from the dealer and they replaced the transmission isolators. I was sceptical but it has removed the rattle. Which is good. I have also been looking at how I drive this thing and I'm trying to up my Rpm up and that is helping aswell.
 
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