Hello Members,

When I write not so good Englisch, appologize for that, Iam from the Netherlands.
S-type 2000, v6, 3ltr, with gearbox

My problem:

I hear a rattling noise from under the car by about 2000-2200 rpm. I think its something that's not oke. I am almost shure that the noise is not coming from under the hood.
The noise starts after driving a while with the car, what means that al the things on temperature.
When I driving and i put on slowly the accelaratorpedal about the 2000 rpm the noise is coming from under the car. When I give more pressure on the acceleratorpedal the rattling noise disappears
Can there be a problem with the gearbox or something. Is it neccesary to change the gearbox-oil. My car has driven 175.000 km.
Can you help me please with my problem, I am desperate about it. On the Dutch forum there is nobody helping me.

Thanks for all.

Greetz

 

Wild guess here... Check for loose heat shields on the exhaust system..

 

Does it makes the noise when idling (so, in Park or Neutral)? If yes, it will be easier to find where the noise comes from. A mechanic's stethoscope may help. Be very careful of moving parts and hot parts.

Might be a catalytic convertor.

 

The noise is only when i am driving in a gear. In neutral or parking there is nothing to hear.
By accelerate I hear the noise at 2000 rpm.

 

Does it make the noise in each gear? You can use the J-gate to control the auto gearbox if you need to. What happens to the noise if you lift your foot off the accelerator pedal? Does it stop immediately (or what does it do)?

Also, you might try driving on a quiet safe road, with the windows down and a friend who sits in each seat and compares the noise each time. Hope the friend can hear something useful

 

Hi, when i take of my foot from the accelerator pedal the noise stops immediately. It is not an automatic gearbox, my car is handgear.
The noise is in each gear I think. When I drive away in the first gear i hear the noise, then from first in second gear i hear noise and in the third gear there is noise. The noise is there about 2200 rpm.
It is possible that is is in every gear but i don't hear that noise in the fourth en fifth gear.

Greetz

 

Hello members,

Today I investigated the problem from the rattling noise what I hear under my car.
It was difficult to search but I found where the noise is from.
I did the following thing:
The car on the handbrake, I opened the hood.
After that i put the gearbox in the first gear. Then I put my foot on the acceleratorpedal en the clutchpedal. I did the same as when you drive away in the first gear, but i did'nt could because the handbrake is on.

So here is my problem:
The rattling noise is at the top of the engine where the sparks are en the manifold. I can not telle exactly the place but it is near to that issue.

So I think i have big problem. Can you give me advise please ?
Maybe there is some member who knows what the problem can be. Is there a problem with the enginevalves or tappets ? Maybe my engine is damaged or must be a lot of engine parts be replaced.

My conclusion is that the noise is hearing when I drive up a hill in the second gear, so when the engine must pull or give power or force the noise is coming from under the hood.

Help me please with your experience.

Greetz Paul from the Netherlands

 

Maybe misfires. If so, the usual cause is an air leak (likely the PCV hose elbow) or faulty coil(s).

There are many posts about each of those.

 

Proper fuel onboard? Conditions sound like the same that are favorable for spark-knock

 

Hello,

Thanks for these answers, but I have some questions.

The fuel in the car 95 RON, is that not oke than ?
Must I do replace the spark plugs or something, maybe that's the problem. Maybe it is useful to do maintenance from the engine ?

Replace coils ? They are very exspensive i think.

Greetz

 

95RON is fine.

If it's misifiring you need to fix it or it'll damage the catalysts as well as being bad for the engine. You could get a cheap OBD tool (usb elm327 - ebay about 20 eur) and see what the codes are.

BTW "faulty" coils includes contaminated ones, such as wet or dirty ones.

 

That is a good point - do you have any OBD trouble codes or any of the dash lights on?

Sounds like it could be valve slap or knocking. But it also could be a blown motor mount that is allowing the motor itself to move a little bit and come in contact with something to produce the noise.

The weird part is that the noise happens at a sweet spot, but once more throttle, it disappears. Makes me wonder about oil pressure.

Let's get a little more background Paul - how many miles or kilometers are on the car? When was the last time the motor was serviced - spark plugs changed, oil changed, etc?

 

Hi The Chris,
I bought the car in October 2010 from an particular seller.
I have no trouble codes and I don't have any of the dash lights on.
There are now 174.000 km on the car.
At 154.000 km the sparks and airfilter are replaced by old owner in 2009.
What I can see in the history maintenance from the car is that there was in March 2008 new oil and oil filter done at 130.000 km.
Then one year later at 145.000 km the car is checked by a garage, the problem is that they not filled in the servicebook, so I can't tell you what they did at that time. So I hope they did oilchange that time, I cannot see that in the history.

Yesterday I investigated the noise with my neighbour, we have the idea that it is a noise like iron particale that is loose or not fitted wel. Or like a bad bearing or something. It is coming from the engine we think. It is difficult to investigate because the noise is only there when I swith from gear and give a little bit throttle, when I give more throttle the noise dissapeares.
When the engine is running stationer you hear nothing and its perfect. In neutral stand.
When the engine must give pull power or when I drive slowly in the second gear at 1700 rpm the noise is coming, when i than give throttle it dissapears.
When i am driving up a small hill in the second gear the noise is very hard . The noise also sounds like when there is to less oil in the engine. I checked yesterday also and i filled one litre. The state of oil dipstick is between the two marks from the dipstick.
Can it be that there is tho less oilpressure in the engine, so than i have a big problem ??? Maybe oilpump ?
I also doubt that there is a problem with the coils or like that. Because the engine is not pinging and further the car is driving well.

Hope you can help me, I called a several jaguarspecialists here in the Netherlands. They only will make money, they tell me nothing over the phone what the problem can be. I must come with the car to them and than they will look for me.

Very much greetings.

Paul

 

Hmm. Difficult one to diagnose without hearing that noise. I thought maybe clutch throwout bearing, as they can make a similar noise, but you would probably only hear that when shifting and maybe shortly after you shift.

If it is valve slap, you could try to drain the oil and add a heavier oil, or even a "valve medic" type of oil conditioner product - if this quiets down the noise then you may have found your problem. I'm still not sure about this though, because you should also hear that slap at idle and wouldn't really be dependent on gear selection.

It may go back to the catalytic converter as well. If you are "lugging" the engine when accelerating up a hill, this may create additional vibration of the motor, which shakes the cat converter around (perhaps loose pellets or particles in the converter). When you give it more throttle, it smooths out the engine and the noise goes away.

If you can, take a very long screwdriver and point it toward the noise and put your ear up to the screwdriver and that can help augment the sound and help pinpoint the location of the noise (a stethascope would be ideal of course). Be extremely careful when doing this while the engine is running.

Sorry, I'm about out of guesses. You could post a video of the noise here too, sometimes that helps.

Good luck!!

 

Get the cheap OBD tool and do the basic checks (monitors Complete, runs CL, fuel trims etc). Note that stored and pending codes are worth reading - do NOT clear them yet.

AFAIK, there are no loose parts in the cats, unless they're broken.

 

Paul, no offense meant here. If it were my vehicle I would take it to the professionals at this point. You and your friend are jumping between rather expensive engine parts, gearbox and clutch.

Ask yourself, should I spend the money for a competent mechanic to diagnose and fix problem or do I start throwing money at engine parts, gearbox parts and clutch.

Good Luck

 

Paultje, is it possible to record the noise onto a file, then download it to the forum? This has been done before BTW.
Leedsman.

 

Right jagV8! If there is any noise from the cats, then something is definitly broken. Usual suspect is a damaged honeycomb and some of the cat guts will break apart and rattle around inside the structure.

In the old days before emissions testing, a quick disassembly and then a prybar into the rear of the cat to extract the guts was a cheap and dirty quick fix (hollow it out). Of course these days that won't fly.

 

Hi members,

Thanks for the support and answers for the problem I have. A friend if mine is a mechanic and he works in an garage.
He took my car for investigation. His conclusion was that there is a probleem with the cardan shaft coupling.
He told me that I must not be worried about, there is nothing with the engine.
Is it a difficult and expensive job to do ?
He told me it was not so urgent to repare, I can drive the car without making me worried about.

Suggestions ?

Greetz Paul.