Upset and A little scared
#1
Upset and A little scared
Hi everyone, I am new to this site because I am a first-time owner of a used jaguar. My car is a 2005 XK eight. I'm a little distressed if not just pissed off but maybe you all can help me clarify. I just bought the car home yesterday upon starting up this morning a loud rattle for just a couple seconds and then car ran fine. Searching this form I found that it's a Vvt which deals with the tensionisor Now I own a late model Mercedes that has tensionisor so I am familiar of how they work and why they're there. First of all let me say I'm upset with the dealer personnel that I bought the car from. Car Was advertised as excellent mechanical running order. As you and I both know this is not the situation is not normal and excellent mechanical order. We also both know that all it takes is a few seconds for start up The symptoms goes away. When I inspected the car I drove 350 miles , Tampa , fl where I saw the car did not purchase it until I see a cold start the next day, then told him I want to see it first thing in the morning and I want to see the completely coldstart. We did that and obviously I didn't hear the situation. Why I'm assuming he let it run couple minutes before I got there and never heard this situation rattle. To me that's out right fraud. Anyone with a little knowledge of tensionisor knows that these do not go out overnight. My question is how serious is this? I've read that it could be just simply a change of the oil which looks like it was done recently and proper or different filter? Not sure what I want to do at this point. I know I bought the car as is without a warranty but there must be something in terms of false advertisement. So guys how serious is this I don't mind putting in a few dollars into it but I don't want to have something very costly. I bought the car as stated in advertisement as excellent working order? So everyone give me a hand at what can I expect in terms of trying to fix this problem? Thanks so much, Rick
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Rogerj (07-26-2016)
#2
The tensioner issue that is well documented in the faq sticky isn't related to VVT as it affects both XKR's which don't have VVT as well as XK8's which do. Furthermore the plastic tensioners were replaced by the 2003 model year although that is obviously not a guarantee that there isn't a problem with them. If you have the skills they aren't that expensive to change if that is the issue.
I think you must first determine if your issue is tensioners.
I think you must first determine if your issue is tensioners.
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Rogerj (07-26-2016)
#3
My car made that noise and only at cold start up. A short time later the idler on the serpentine belt tensioner disintegrated in the middle of nowhere. The bearing in was on the way out and that rattle was the warning sign.
Take the belt lose and see if the 2 plastic belt idlers have play or turn stiff.
Dave
Take the belt lose and see if the 2 plastic belt idlers have play or turn stiff.
Dave
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reb1999 (10-01-2015)
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If it has any resistance to being turned or if there is any play in them then they are shot. Eventually the bearings seize and the plastic pulleys simply fly apart. You can replace them with metal idlers and they are less than $20 each. The rattle sound comes from the belt tensioner bouncing as it tries to overcome the sticky bearing. If one is bad replace them both.
Hopefully thats all it is as its an easy fix.
Here is my post on them, 2nd post down...
Dave
Hopefully thats all it is as its an easy fix.
Here is my post on them, 2nd post down...
Dave
#7
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#8
Tensioner issues causing slack in the cam chains is often described as a 'rattle'. VVT noise is more often described as a 'ticking' on cold start. If the noise only happens on a true overnight cold start that might imply VVT issues although even at the first of October I find a 'cold' start description somewhat misleading for a Panama City Beach, FL location.
You do not identify the miles on the car. VVT issues tend to be wear related, tensioners can fail at any time.
There have been several reports of failed tensioners of the later metal version. They have a ratcheting action that is intended to prevent retraction and slack even without oil pressure. If you are sticking with your 'rattle' description that means it should be imperative that you get the valve covers off ASAP . . . as in TODAY.
A quick, cheap test for VVT vs tensioners is to add a can of RESTORE oil treatment. It thickens the oil as would changing it to a higher weight oil would. If that quietens the noise perhaps it is the VVT's and that oil change is all that is needed.
The oil pressure 'gauge' is really an idiot gauge that is off or on based on an oil pressure point of 7psi. Not much comfort for a $12,000 engine. Search 'RealGauge' for a solution to that issue.
You do not identify the miles on the car. VVT issues tend to be wear related, tensioners can fail at any time.
There have been several reports of failed tensioners of the later metal version. They have a ratcheting action that is intended to prevent retraction and slack even without oil pressure. If you are sticking with your 'rattle' description that means it should be imperative that you get the valve covers off ASAP . . . as in TODAY.
A quick, cheap test for VVT vs tensioners is to add a can of RESTORE oil treatment. It thickens the oil as would changing it to a higher weight oil would. If that quietens the noise perhaps it is the VVT's and that oil change is all that is needed.
The oil pressure 'gauge' is really an idiot gauge that is off or on based on an oil pressure point of 7psi. Not much comfort for a $12,000 engine. Search 'RealGauge' for a solution to that issue.
#10
If it has any resistance to being turned or if there is any play in them then they are shot. Eventually the bearings seize and the plastic pulleys simply fly apart. You can replace them with metal idlers and they are less than $20 each. The rattle sound comes from the belt tensioner bouncing as it tries to overcome the sticky bearing. If one is bad replace them both.
Hopefully thats all it is as its an easy fix.
Here is my post on them, 2nd post down...
Dave
Hopefully thats all it is as its an easy fix.
Here is my post on them, 2nd post down...
Dave
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A fresh oil change with known correct oil and verification that the new filter has such a valve would seem cheap insurance.
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