| Author | Message | ||
     June H. Han (Junehhan) New Member Username: Junehhan Post Number: 34 Registered: 04-2003 |
Hey guys, i've only had my 03 Discovery for 2400 miles, so i'm fairly new. It definately seems to make a lot more noises than my old lemon Freelander which I guess is just part of the hardware. However, I did have a question: Do any of you guys know whether this vibrating noise is normal? It's a really deep resonating vibrating noise that sounds like it's possibly coming from the rear when i'm travelling on the highway exactly between 58-61mph. At first, I thought it was a tire out of balance, but i'm not sure what it could be since it's a deep resonating noise that sounds like it's travelling from under the rear of the vehicle. I know that this vehicle has a really heavy duty frame, so could it be just resonance i'm hearing from the frame rails? It appears to happen only in the speed that I listed above. This is an HSE, so it has the Goodyear Wrangler HP tires. I first noticed this on my trip to Paragon a couple weekends ago, but it was more pronounced and noticeable on my way back from Paragon. | ||
| Andy Thoma (Andythoma) Senior Member Username: Andythoma Post Number: 352 Registered: 01-2003 |
Is the truck all stock? Does it happen on down hill or up hills only or all the time. I know on series 1 discoveries that sound you discribed is associated with a failing u-joint or rotoflex in the rear. It can also happen if the balance is off on the driveshaft/joints. It happens when your off the gas and going downhill, the speed of the driveshafts are different as the weight of the truck shifts forward and causes a vibration. But I would doubt a new truck would have that issue. How about the exhaust hitting the frame or something? When the truck is revving a certain rpm it causes the exhaust to shift and vibrate? Isn't paragon a 4 wheel park? Maybe you bent the exhaust or dented one of the mufflers? Sorry I don't know enough about D2's to suggest more than take it to a dealer. Or you could swap me that big 4.6l v-8 for my 3.9l v-8, that would take care of all your problems ...  | ||
| June H. Han (Junehhan) New Member Username: Junehhan Post Number: 35 Registered: 04-2003 |
Yeah, Paragon is a wonderful place to wheel on, but I did nothing but the Green trails and the only part of my vehicle that bottomed out once was the rear trailer hitch which really kills your departure angle. The noise was noticeable before I went, but more so afterwards. It does it when i'm both on and off the gas pedal, so giving it gas doesn't appear to affect the noise one bit. The wierd thing, is that I get that deep resonating noise at only between 58-61mph. I just got it, so I would hope that it's all stock This new 4.6 litre 278 V8 is THE engine that Land Rover should have put in the Disco 8 years ago! The torque feeling from it is absolutely wonderful. | ||
| Andy Thoma (Andythoma) Senior Member Username: Andythoma Post Number: 353 Registered: 01-2003 |
Yea I drove a new one and thought, wow, I want this engine. I like my D1 and love using it as a trail truck and commuter. I think once my wifes out of medical school in 2/3 years I'll have to pick up a d2a with that motor. I'd guess an issue with the exhaust, make the dealer drive with you so you can point out the noise to them. | ||
| Jim Reynolds (4x4xfar) Member Username: 4x4xfar Post Number: 60 Registered: 05-2003 |
June, I have an '03 and havn't noticed any noise like that. I would take Andy's advice or get an adventure rack and some M/T's you'll be amazed how the noise will fade away!!!! Good luck -Jim | ||
| Peter J. Kelly (Pjkbrit) New Member Username: Pjkbrit Post Number: 23 Registered: 05-2003 |
1.Get shot of those Goodyear HPs...they are the worst tire I have ever had on any car...noisy as hell and go out of shape real easy....put some Michelins on it and you won't look back. I cannot believe LR STILL specify that Goodyear as OEM. 2. Could be a propshaft balance issue. Otherwise this motor is too new for any of the other 'usual' LR probs. Pete | ||
| Craig McLaughlin (Cmclaugh) New Member Username: Cmclaugh Post Number: 37 Registered: 06-2002 |
I had a 96 Discovery with a deep resonating noise at highway speed. Replaced rear diff, wheel bearings, brake rotors and upgraded driveshaft to a non-rotoflex style from GB and still had the problem. I checked all the u-joints and even had the dealer verify the driveline angles were correct. Never could find the source of the problem. I suspect something deep within the transfer box was responsible. So I sold it and bought a D2 and have been happy ever since. Strangely enough, there is still a very slight resonance noise at the same speed on the highway about 75 mph. Design related? | ||
| June H. Han (Junehhan) New Member Username: Junehhan Post Number: 38 Registered: 04-2003 |
Thanks for your suggestions guys. I've got 2500 miles on it now, and I plan on having my 7500 mile service done at 3000 miles just so I can have some synthetic Amsoil Series 2000 75w90 gear lube installed in the front and rear axles, along with switching to a fully synthetic Amsoil 10w40 oil. At the same time, i'll probably have the dealer look at it as well. It's wierd because this noise doesn't change whether I step on the gas or not. I don't think it's an issue with the exhaust because the noise doesn't change whether i'm giving it gas or not. It sounds like it's some sort of deep resonance coming from wherewhere under the rear part of the vehicle. I don't feel any type of vibration other than what's normal for the road surface. I've had my new Disco up to 110mph according to the speedometer and there was absolutely no type of vibration noise above 61mph all the way upto 110. This new engine seems to be a torque monster as I only needed to give it 1/3 throttle to hold it's speed at 110. Impressing thing, is how solid this "brick" felt at that speed, although it will likely be just a one time thing since those are felonious speeds that were made necessary due to the situations at the time. | ||
| June H. Han (Junehhan) New Member Username: Junehhan Post Number: 39 Registered: 04-2003 |
As someone with an 02 Disco described, a better way to describe this wierd noise is a really deep low pitched rumbling noise between 58-61mph coming from under the rear of the vehicle. |
