Weird annoying pulsing noise
#1
Weird annoying pulsing noise
Hi everyone, just joined the site as just bought my first jag after being an avid Subaru rally fan for years. Was time to move on and up to a XKR supercharged and certainly seems the right car! Smiles all round!
It's a 2008 but only done 19,000 miles
Right, down to my potential problem.
At a constant speed, say 50+ there is a noticeable sort of 'pulsing' from the engine bay, around 4 secs on and 4 secs off.
I wouldn't have said 'surging' as no difference in power.
The guy who sold me it said it was normal and just the supercharger. Having driven it for a couple of weeks, I don't think it's normal but I've got nothing to compare it to so hopefully someone on here can put me straight?
It's not a loud noise but you feel/sense it through the car if you know what I mean.
The performance is fine and you can't notice this until higher constant speeds but at all speeds when cruising. I tried to film the sound but it doesn't really pick it up. Can't really notice under heavy acceleration.
I've read about resonance and a bracket fix but I would have thought that would be a constant drone and not pulsing like this? I've had loud resonance on my old Subaru but it's weird that it 'pulses'.
Could it be the supercharger?
Mmmmmm not had anything like this before but this is my first supercharged car.
___________
2008 XKR (added by GGG)
It's a 2008 but only done 19,000 miles
Right, down to my potential problem.
At a constant speed, say 50+ there is a noticeable sort of 'pulsing' from the engine bay, around 4 secs on and 4 secs off.
I wouldn't have said 'surging' as no difference in power.
The guy who sold me it said it was normal and just the supercharger. Having driven it for a couple of weeks, I don't think it's normal but I've got nothing to compare it to so hopefully someone on here can put me straight?
It's not a loud noise but you feel/sense it through the car if you know what I mean.
The performance is fine and you can't notice this until higher constant speeds but at all speeds when cruising. I tried to film the sound but it doesn't really pick it up. Can't really notice under heavy acceleration.
I've read about resonance and a bracket fix but I would have thought that would be a constant drone and not pulsing like this? I've had loud resonance on my old Subaru but it's weird that it 'pulses'.
Could it be the supercharger?
Mmmmmm not had anything like this before but this is my first supercharged car.
___________
2008 XKR (added by GGG)
Last edited by GGG; 02-25-2017 at 05:28 PM.
#2
Welcome to the forum Swisstone,
I've moved your question from General Tech Help to XK/XKR forum. Members here with the same model will be able to help.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
I've moved your question from General Tech Help to XK/XKR forum. Members here with the same model will be able to help.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
#3
Originally Posted by Swisstone;1628047
I've read about resonance and a bracket fix but I would have thought that would be a constant drone and not pulsing like this?
___________
2008 XKR [I
I've read about resonance and a bracket fix but I would have thought that would be a constant drone and not pulsing like this?
___________
2008 XKR [I
(added by GGG)[/I]
Your noise is different and I have no answer for you but could it be related to the AC compressor cutting in and out?
#4
#6
#7
Thanks for initial help guys! Sure it's all the time and aircon doesn't make any difference but I'll verify that tomorrow. Been out in it today a and you can start to hear/feel it from 35 mph and gets progressively worse as speed increases but more noticeable at constant speeds. I would say more 2 secs on and 2 off now not 4 if that makes a difference! Cheers
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#8
#9
The engine sounds perfect at idle or Erving on drive.
It's also only covered 19k miles if that makes any difference.
#10
I've had a case where I could swear the transfer case on an AWD BMW was going bad and making a gear wear noise. I was ready to buy a replacement case when I punctured a tire that could not be repaired and bought a new set of rubber. To my amazement it was the tires. I've been driving a wrenching for 50 years and thought I knew my stuff. I learned my lesson.
Yes, I would agree that at 19K most wear items would not be going bad. But you have some kind of issue going on. Have you considered an underbody panel that my be resonating at speed?
Yes, I would agree that at 19K most wear items would not be going bad. But you have some kind of issue going on. Have you considered an underbody panel that my be resonating at speed?
Last edited by GordoCatCar; 02-26-2017 at 01:50 PM.
#11
I've had a case where I could swear the transfer case on an AWD BMW was going bad and making a gear wear noise. I was ready to buy a replacement case when I punctured a tire that could not be repaired and bought a new set of rubber. To my amazement it was the tires. I've been driving a wrenching for 50 years and thought I knew my stuff. I learned my lesson.
Yes, I would agree that at 19K most wear items would not be going bad. But you have some kind of issue going on. Have you considered an underbody panel that my be resonating at speed?
Yes, I would agree that at 19K most wear items would not be going bad. But you have some kind of issue going on. Have you considered an underbody panel that my be resonating at speed?
#13
#14
A couple of weeks ago, I had a noise that sounded like a bag of rocks being tossed in a dryer. I was certain that it was coming from the supercharger, and that possibly SC bearings were in need of replacing. It turned out to be the water pump wobbling so badly that it was making the noise. Replaced the pump and the cacphony subsided. Just a thought.
#15
Morning all, well turned the a/c off/on and no difference to the issue. What exactly is the serpentine belt? Haven't completely ruled out front tires but it's the pulsing that doesn't fit with that and usually an increasing whine. It's going into the local specialist on 14th march so will get them to test drive and report back. Wish I could sound record it for you all to hear!
#16
I had a similar issue that was driving me batty. Then I noticed the rt front tire was wearing like crazy on the outside edge. Got an alignment and problem solved.
The mystery is that the car was steering and handling perfectly during the whole process. And yes, the droning was rhythmic and it would come and go dependent on road surface/speed. Go figure.
Too bad I wasted a good tire before I got wise. I need to mention this was on my 2012 Chrysler 300C.
The mystery is that the car was steering and handling perfectly during the whole process. And yes, the droning was rhythmic and it would come and go dependent on road surface/speed. Go figure.
Too bad I wasted a good tire before I got wise. I need to mention this was on my 2012 Chrysler 300C.
Last edited by user 2029223; 02-27-2017 at 07:21 AM.
#17
I had a similar issue that was driving me batty. Then I noticed the rt front tire was wearing like crazy on the outside edge. Got an alignment and problem solved.
The mystery is that the car was steering and handling perfectly during the whole process. And yes, the droning was rhythmic and it would come and go dependent on road surface/speed. Go figure.
Too bad I wasted a good tire before I got wise. I need to mention this was on my 2012 Chrysler 300C.
The mystery is that the car was steering and handling perfectly during the whole process. And yes, the droning was rhythmic and it would come and go dependent on road surface/speed. Go figure.
Too bad I wasted a good tire before I got wise. I need to mention this was on my 2012 Chrysler 300C.
#18
#19
No didn't get the front wheels spin balanced as have no steering wheel wobble so just got alignment/geometry set up (not cheap) but it's an expensive laser 4 wheel machine to recoup cost of! Ha. I wasn't doing this as part of the current problem, just needed doing. Castellation of tires is uneven tread wear isn't it so you think that would show up on a spin balance? If the local garage has a spare pair of wheels, another option to swap over if willing?
#20
No didn't get the front wheels spin balanced as have no steering wheel wobble so just got alignment/geometry set up (not cheap) but it's an expensive laser 4 wheel machine to recoup cost of! Ha. I wasn't doing this as part of the current problem, just needed doing. Castellation of tires is uneven tread wear isn't it so you think that would show up on a spin balance? If the local garage has a spare pair of wheels, another option to swap over if willing?
It doesn't take much of an impact from a pothole or curb to cause a belt in a low-profile radial tire to separate or be damaged, even if there are no obvious signs such as a bubble in the sidewall or uneven tread wear. To determine if a tire has a separated belt, put it on a wheel balance machine and make sure that it runs true by watching the sidewalls and tread for any in-and-out, up-and-down, or side-to-side motions. Also make sure that the wheel rim runs true.
Your stated that you recently bought your 2008 XKR with 19,000 miles. Does it still have the original tires? If not, when were they replaced, and how many miles ago? What brand and model? What are the F/R cold inflation pressures? How many previous owners and do you have all the service records? Any history or other evidence of front end damage?
Stuart