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  #25  
Old 01-11-2015, 05:03 AM
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Re: 2014 JGC Diesel rattle (Australia)

I am referring to the clatter..

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  #26  
Old 01-11-2015, 07:12 PM
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Re: 2014 JGC Diesel rattle (Australia)

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Originally Posted by Hutch801 View Post
I am referring to the clatter..
Thanks Hutch and Jtrembath, that's not good to here. Haven't had latest update. Not going to by the sounds of it! Since Nov and them putting an additive in tank the clatter has not returned. Have done just on 750km with additive test (don't know what it was), refuelled using BP and another 150km, still OK. As I have posted in Problems Au, I have no confidence in there latest round of updates after the A/C ongoing stuff -UP.
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Old 01-11-2015, 07:36 PM
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Re: 2014 JGC Diesel rattle (Australia)

I've done about 270km in the week since updating. The noticeable abnormal clatter noise has not resurfaced...... yet.

I should clarify that there is always some injector noise which varies with revs/engine load etc. This is normal as it's a diesel engine, not a Nissan Leaf electric and the fuel is pressurised to something like 2000bar so it's not going to be completely silent. There is always going to be a "tak, tak, tak, tak" noise which is going to be most audible when the revs are low and when your foot is on the load pedal.
To hear it clearly and distinctly you have to drive with the window open and listen for it.

The abnormal noise I had was a very noticeable loose clatter "K-LAK, K-LAK, K-LAK, K-LAK, " when at low revs and high load when the fuel is injected at higher flow. I could hear it clearly with windows up or down.

As soon as the service guys applied the RRT 14-104 (18-019-14A) PCM update, that type of noise was instantly gone.


Normally running the VM engine is certainly quieter than any new 4 cyl or 5cyl 4WD diesel from Hilux, Ranger, Pajero, Colorado etc.
I test drove all of these before buying the JGC.

Ok there are some smoother like the new 3.0TT in the Landrover and the 4.5V8 in the Cruiser and 4.2V8 Audi but maybe that's the exhaust grumble masking the other noises.

The noisiest new diesel 4WD is probably the Colorado 2.8 there is a significant noticable injector clatter in normal running in that truck.
The 3.0L Nissan Patrol is pretty bad too.


The abnormal Diesel clatter I had in the Jeep was probably only slightly louder but more "loose" sounding than any of the 4cyls. Certainly it's pretty annoying.

When off the pedal (minimal fuel injection) there is no injector noise at all of course.

Hope that helps to describe what (I think) is the normal and abnormal condition.


On a side note: Because I'm an Engineer (groan ) I had been doing a bit of reading about Diesel injectors in modern engines prior to buying this, my first diesel. These things are pretty complicated and a lot has been done to comply with emissions ratings and generally to improve the smoothness of engines in the last 10years or so. Fascinating stuff.

The VM engine has some sort of D-IRS (digital Injection Rate Shaping) developed by Fiat. There appears to be a fine line in the balance between soot production, NOx, combustion noise, power output, economy and of course variations in the fuels.
It's all in controlled in the software and it looks like they are still in the debugging phase.

I feel a bit like a beta tester, but that is becoming the norm these days with all of our various and increasingly complicated electronic devices.
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  #28  
Old 01-11-2015, 08:41 PM
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Re: 2014 JGC Diesel rattle (Australia)

Thanks again Steve. Drove a Colorado 2.8 to Darwin from Perth in July 14 and it does have a mild diesel clatter that continues into the mid range rpm's then not too bad for comparison. The Jeep is quieter even when cold than the 2.8 and once warmed up I consider the VM other than just above idle very satisfactory. It's when it spits the dummy that I am complaining about and as I have said before sounding like some piece of 1950 farm machinery that is the issue. It is an old loud tractor diesel clatter.
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  #29  
Old 01-12-2015, 06:39 AM
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Re: 2014 JGC Diesel rattle (Australia)

I had the 104 update to the PCM but my clatter which is minor at around 1400 or under a little load, again very minor and more often than not I hardly notice it unless I have radio down.


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Old 01-21-2015, 01:28 AM
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Re: 2014 JGC Diesel rattle (Australia)

Have had the diesel rattle from new. Always at low revs, 1200 - 2000, and generally under light throttle. Some days are worse than others. Had the PCM upgrade this morning and on the 40km trip home there was no rattle. My vehicle has done 3800 km and always been filled with Caltex Vortex. Have a long trip planned over the long weekend and will post a reply if anything changes.

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  #31  
Old 01-21-2015, 05:26 AM
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Re: 2014 JGC Diesel rattle (Australia)

Michael prepare for it to come back as they tell me it is only a temp fix for the rattle and they are yet to lock down a permanent fix. Mine was that minor I can't really tell any difference.


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  #32  
Old 02-10-2015, 07:02 PM
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Re: 2014 JGC Diesel rattle (Australia)

It has been roughly 1 month since I have had the upgrade done, glad to say the rattle which was apparent at around 1500-2000 rpm under medium load is gone for good.

However I have noticed two other changes, firstly the gearbox would hold onto 1st gear much longer when there is any steering input.

Secondly the 1st-2nd gear change is a little rough at the first gear change after a warm restart. Any subsequent changes are fine.
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Old 02-10-2015, 11:18 PM
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Re: 2014 JGC Diesel rattle (Australia)

Same story for my update.

1 month, 1500km (88 separate "warm ups") since doing the software update and the knock/rattle noise that mine had has not made any re-appearance.

Once warmed >70 C up the engine is very quiet and smooth for a diesel.

From a cold start there is still a "tik tik tik" fuel injector noise which I believe is normal and is distinctly different from the very annoying loose rattle symptom from earlier.

Lets hope the same software update cures the DPF "soot alarm" problem as well as it has cured the rattle.

.
.
.
The slightly more jerky response from 1-2 gear is not related. It is a different software "glitch" i guess you could say, where the gearbox program for learning the shift patterns is not fully optimised yet, which is a nice way of saying that it actually makes it worse as you drive it.

At the moment there 3 x TSB for this issue released in last couple of weeks for the 5.7L V8 , the 3.0L/3.6L V6 petrol and then the SRT.
We're still waiting on the one for the Diesel.

It will also remember when you turn the ECO button OFF
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  #34  
Old 02-13-2015, 09:51 AM
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Re: 2014 JGC Diesel rattle (Australia)

I just had the upgrade done during the 20,000km service and the engine no longer has that annoying low rev engine rattle. Unfortunately, the lube section have overfilled the engine oil and I will be taking it back to have that rectified. As for that annoying engine rattle - goodbye. Now if only they could get the engine temperature gauge to stop sitting on the last white line before the red section when towing our caravan up inclines I'd be really happy. There doesn't seem to be any consistency as to when the engine cooling fan will or won't cut in and that tension of having to monitor the temperature gauge just takes all the fun out of it.
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  #35  
Old 02-13-2015, 11:09 PM
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Re: 2014 JGC Diesel rattle (Australia)

Be interested to see if the rattle comes back, according to my dealer this not a permanent fix.


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Old 02-13-2015, 11:51 PM
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Re: 2014 JGC Diesel rattle (Australia)

Quote:
Originally Posted by Blue Max View Post
I just had the upgrade done during the 20,000km service and the engine no longer has that annoying low rev engine rattle. Unfortunately, the lube section have overfilled the engine oil and I will be taking it back to have that rectified. As for that annoying engine rattle - goodbye. Now if only they could get the engine temperature gauge to stop sitting on the last white line before the red section when towing our caravan up inclines I'd be really happy. There doesn't seem to be any consistency as to when the engine cooling fan will or won't cut in and that tension of having to monitor the temperature gauge just takes all the fun out of it.
If you are towing at greater than 60kph your engine fan isn't cooling, it's the air flow through the radiator.

If you are worried about temps, speed up!

It's nothing to be concerned about, I would prefer that the users get educated than they dumb down the product by buffering the output personally.
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