Low Range 4WD knocking noise - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 21 (permalink) Old 01-03-2009, 12:44 AM Thread Starter
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Low Range 4WD knocking noise

I took my less than 10,000m 07 Commander out for a drive in the (sandy) desert last weekend for the first time last weekend. I did not get far.

I was driving on sand tracks, probably less than 5 miles in Low Range when I got a loud knocking sound from under the drivers seat, I think. After lots of to'ing and fro'ing, having switched off LR and the anti-slip, a long (50metres) in reverse stopped the knocking. The next day I tried again, the same thing happened.

It is at the dealership, but I have no faith in them*, so would appreciate some thoughts to steer them in the right direction.

* They just fired four good people.
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post #2 of 21 (permalink) Old 01-03-2009, 03:06 AM
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What model Commander do you have Sandy?
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post #3 of 21 (permalink) Old 01-03-2009, 04:17 AM Thread Starter
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It is a 4.7 Limited.

I just picked it up from the dealer, apparently the noise is "normal"!

I am sure it has something to do with the electronics that govern either the differential or the antislip. All the dealer did was take it for a test on the road. Are there any other tests or inspections I could ask them to do?
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post #4 of 21 (permalink) Old 01-03-2009, 06:08 AM
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You shouldn't use low range until its necessary. Low range is made to be used temporary !

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post #5 of 21 (permalink) Old 01-04-2009, 01:47 AM Thread Starter
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Quote:
Originally Posted by Ahmed View Post
You shouldn't use low range until its necessary. Low range is made to be used temporary !
It was necessary!

Anyway I only used it temporarily as the car sounded like it was going to fall apart.
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post #6 of 21 (permalink) Old 01-04-2009, 12:45 PM
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Quote:
Originally Posted by Sandy View Post
I took my less than 10,000m 07 Commander out for a drive in the (sandy) desert last weekend for the first time last weekend. I did not get far.

I was driving on sand tracks, probably less than 5 miles in Low Range when I got a loud knocking sound from under the drivers seat, I think. After lots of to'ing and fro'ing, having switched off LR and the anti-slip, a long (50metres) in reverse stopped the knocking. The next day I tried again, the same thing happened.

It is at the dealership, but I have no faith in them*, so would appreciate some thoughts to steer them in the right direction.

* They just fired four good people.
I seriously doubt that you you needed to use 4-Low. Ahmed is out in the desert all the time and very rarely has to use the low range. 4-Low is only for very difficult situations such as rock crawling, deep mud, and sand in some cases. You should NOT go faster than 25 mph (40 km/hr) in 4-Low. Using your low range for for a distance of 5 miles is probably not good for the system.

Here are the 4-Low instructions from the Owner's Manual:

4 LOW
Four Wheel Drive Low Range — Low speed 4 wheel
drive. Locks the front and rear driveshafts together.
Forces the front and rear wheels to rotate at the same
speed. Additional traction and maximum pulling power
for loose, slippery road surfaces only. Do not exceed 25
mph (40 km/h).

Shifting Procedures

4 HI to 4 LOW
With the vehicle at speeds of 0 to 3 mph (0 to 5 km/h),
key ON or engine running, shift the transmission into N
(Neutral), and raise the transfer case T-handle. “The 4WD
LOW Indicator Lamp” in the instrument cluster will
begin to flash and remain on solid when the shift is
complete. Release the T-handle.

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Last edited by jeep5253; 01-04-2009 at 12:49 PM.
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post #7 of 21 (permalink) Old 01-04-2009, 10:06 PM
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This thread makes me nervous! I have NEVER used my 4 Lo setting yet, I have been tempted to 'test' it, just from the driveway to the garage, but have never gotten round to it.

Maybe I should leave it that way!
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post #8 of 21 (permalink) Old 01-04-2009, 10:11 PM
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I periodically put mine in 4LOW just to keep things all functioning nicely. I think you're supposed to do it once a month or so. It gives me a reason to go play!

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post #9 of 21 (permalink) Old 01-04-2009, 10:45 PM
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I use 4 LOW (I have four 4 Wheel Drive vehicles) around town all the time in winter as it provides more traction ... I live down town in a small town Northern Ontario, Canada and the roads are covered with a thick layer of ice and snow all winter though
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post #10 of 21 (permalink) Old 01-05-2009, 02:35 AM Thread Starter
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I have also used 4 Low on many vehicles, Land Rover Defenders, Discoverys, Cherokee and Wrangler, in many conditions - here in Oman we have mountains, sand and rocks. I've had trouble before as my Land Rovers were all pretty old.

I have never had what sounded like - remember when you were a kid and you put a piece of cardboard to hit your bicycle spokes to make it sound like a motorbike - well that noise. Not good.

Cupra, I'm nervous too, first time I seriously take my Commander off road and it failed me. I like going to places that are off the beaten track, which are most places here - you can't go into the Empty Quarter with your kids in the back of the car in a car you don't trust.
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