Phaeton :: Pulsing Occur On Power Steering When Maneuvering At Low Speed
Sep 1, 2013
Some of you might remember I've pondered here before about the strange pulsing that occurs on my steering (on the V10) when maneuvering at low speed. It's always done it. Well, for the 18 months and 15k miles I've had the car.
Nobody (including Phaeton technicians) who have heard it/felt it have had any useful advice or insight (save offering to take the engine out to check on various bits).
I had always assumed that it was something like the load when the car is being parked etc was sufficient such that some relief valve was lifting momentarily and repeatedly. However I've come to realize that it is not just the slow vehicle speed, but engine speed too. Of course, nearly all parking maneuvering is done at tick over. But if I raise the revs just a little, the phenomenon seems to go away. Not easy to isolate maneuvering speed from engine speed... which is why I'd not really noticed before.
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I just took my 2009 Subaru Forester (80,000 miles) in to a mechanic because it was having an intermittent power steering assist failure during low speed maneuvering (i.e., parking lot). This is always accompanied by a loud rhythmic whining form under the hood (kind of like a whaawhaawhaawhaa). By intermittent, I mean maybe 50% chance of it happening when I am maneuvering in a parking lot. By failure, I mean I can still turn the wheel but it's much harder. The mechanic diagnosed it as the following:
dry rot in drive belts, recommended replacement
leaky rack and pinion, recommended replacement
2 leaky front struts
I checked my power steering fluid before I brought it in and the level/color looks great. The mechanic said in addition to the leak that there's a little bit of a catch in the steering at a certain steering position when going faster, but I haven't noticed it myself. I have trusted this shop in the past and had good experiences, but there has been a lot of turnover lately, so I'm unsure of what to do. I went ahead and had them change the belts, but decided to wait on the rack/struts until I did more research/got a second opinion.
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When I apply the brakes moderately at speeds between 60 mph and 80 mph, the brakes pulses and the car shakes. If I press harder, the intensity gets worse shortly and then disappears the harder I press. The front steering wheel does not shake so I believe it is the rear brake or wheels. This problem started after I changed the rear VW brakes rotors and rear VW pads and changed all four wheels with remanufactured VW Phaeton wheels. The issue must be with the wheels,brakes, or lug nuts. The tires have not been changed but they are fairly new from what I can tell. The front rotor and pads was changed by the prior owner and I've never had issue with them, they are fairly new and look to be OEM.
Prior to reinstalling the new wheels, I cleaned the rust off of the front rotor surface that makes contact with the wheel and applied high temperature paint. One of the wheels I had a run in the paint (and there is no way I can make the paint 100% the same thickness) so perhaps this has slightly misaligned the front wheels to the rotors.
When I did the brake job, I cleaned the driver side rear hub of surface rust prior to installation of the rotor. I did not clean the hub on the rear passenger side because the hub and wheel bearing was changed a few months prior. I did snap the plastic for the speed sensor for the abs on the rear passenger side. I epoxied the plastic back together and have no ABS errors when the car is scanned. Everything was torqued per VW recommendations. I also checked the calibers sliding mechanism (for left to right movement if rotor slightly warped or out of true) and they moved freely and was not locked up. The only part of the job that was not 100% by the book is I used a hand made tool to push the pistons in on the calipers so I could install the pads (I had to push and turn the piston roughly at the same time but was not 100% at the same time because the tool was hand made).
I've had the wheels professionally rebalanced balanced at a tire shop with a fairly modern balancing machine (digital computer flat screen readout). Originally the wheels was balanced with an older balancing machine and when they rebalanced it it was noted the wheels was way out of balance. I had a bad steering wheel shake and the car vibrated significantly prior to the new balance. The shaking improved greatly with the rebalancing but I could still feel a subdued shake in the seat of my pants (steering wheel shake is gone). Yesterday, I retorqued all of the lug nuts and found the driver side rear and passenger side front had one loose lug nut. Also it appeared that the lug nuts may have been installed with an impact driver and probably not torqued because some were very tight. I used a dial gauge to check both the rear tires and I have about 15-20 thousands of movement in each wheel when rocked side to side and top to bottom. Prior to tightening the lug nut on the driver rear, I had 100 thousands of side to side movement. Car now runs much smoother (maybe not as good with the original wheels and brakes but pretty good) after retorquing all the lug nuts, but the same 60-80 mph pulsing / shaking happens when apply the brakes at speed, perhaps even worse.
I've also checked the rear rotor and wheel runout with the dial gauge and I didn't have anything over 4 thousands on the rotor or wheel when rotated. My jig for the dial gauge was not the best since it was hand made and was attached to the ground instead of the car, so any dial gauge measurements could be off, but I would think they tolerances would be even better if I had a proper jig mounted to the car (not floor). The only thing that I haven't replaced is the lug nuts. Tightening them did seam to change the brake pulse behavior for the worse but did make the car run smoother. Could it be possible that the lug nuts are stretched and this is producing the behavior I'm seeing? I've head the ABS can cause a shake if the speed sensor is damaged.
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Ever since the day I bought the car, it has had a highway speed pulsing vibration. This vibration manifests once you cross about 90kph, and pulses like a sine wave.
Think of it like this - OOOOOOooooooOOOOOOooooooOOOOOOooooooOOOOOO - where big O's are vibration and little o's are absence of vibration.
I have had the wheels and tires rebalanced several times on various machines over the years in attempts to rid myself of it. The original owner had theorized that the car was so heavy and had sat on its aftermarket rims in one spot for so long that the wheels had bent, which does not appear to be the case. The dealer has experienced the symptoms but cannot find a cause...though I fear they are less knowledgeable about the car than I am. I note that several people on the forum have had vibration issues due to drive shaft bushing failures...but in skimming the relevant threads, none of those people characterized it as a pulsation OR a constant issue that I saw.
I wouldn't say the pulsing was fast...think 4-5 seconds of vibration and then 4-5 seconds of peace.
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Funny pulsing ticking sound on full lock. Only noticeable when parking etc. But once it's started making it, it stops when the lock is unwound... but does it again without lock when the car reverses.
There is no feeling through the wheel or through the chasis when going forward... but subjectively it can be felt when going backwards.
Been getting a little bit more prevalent over the last thousand miles. Driving normally, steering feels perfectly normal.
I've checked the power steering fluid. If anything the reservoir is over full.. so it's definitely not short of fluid. Should the fluid be checked from unscrewing the dipstick.. or with is jut dipped in and not screwed up? Either way it's still over the max line.
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When my AC turns on or changes speed - a humming sound occurs. It only lasts for about 1 - 2 seconds.
Is this normal
It sounds similar (higher pitched, but not as loud) to the humming you hear when you turn the vehicle off.
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I was out late last night driving the car on a local freeway, and my friend wanted a better look around the interior of the car. So, I turned on the two front interior dome lights, the round ones next to the sunroof controls? Anyway, we both noticed right away that they were pulsing in intensity. It was very slow, may from high to low once a second or so...just like in a sci-fi show when you have a living machine?
Anyway, is that a sign of the alternator going? I've never seen this behvior in the car before. It went away at idle. The car was travelling 100km/hr in 6th gear. Headlights were on low beam, as were dash lights. No other electrics on. Just not sure if it is normal or if I should be concerned.
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When coming to a full stop, there is a growling/grinding sound from beneath the floor behind the brake pedal and I can feel the growling./grinding in the pedal as well. Used to happen occasionally, now is happening more often than not. When the Service ABS System/Service Traction System message is displayed (occasionally) on the message center, the growling/grinding doesn't occur and the brakes work. Like normal. When I turn the car off and restart it, the messages are no longer displayed and the growling/grinding sound and feel returns.
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My wife has a Sierra 1500 2WD 6cyl that is doing the low speed ABS pulsing. I read this forum and performed the sensor cleaning as described in the TSB from GM. The problem did not go away, so I pulled the ABS fuse for now. When I was cleaning the sensors - which were covered with crap - I noticed a lot of grease between the lobes on the reluctor ring in the hub. I cleaned it as best I could, but I could not get all of it. My question is - should there be any grease visible on that ring at all? If not, then do I need to replace the hubs? If some grease is ok, then I guess I will do a voltage check on each sensor, but I don't want to change the sensors if they are just going to get dirty again. The problem is on both sides.
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I have a 2009 Ford Focus and have been having a problem with the brakes. When I hit the brakes at any speed there is a feeling of pulsing as I slow down. It is proportional to the speed I am going. It feels like there is an unevenness to the rotor or brake drum that makes one spot on either of those hit the brake pad/shoe more severely than the rest of the pad/shoe and thus I slow down more during that one spot. Maybe the best way to describe the feeling is like this: While the brake pedal is pressed down it feels like I am slowly pulsing the pedal even though the pedal is steadily pressed down. This pulsing feeling slows down as I slow down until I stop. What might cause this?
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I have a problem with the front rotors on my '01 Impala warping. The pulsing is really bad when decelerating from highway speed. They will last maybe a month after installing before they start to warp again. I purchase my parts at the local NAPA store. Is there something I could be doing wrong during installation or it bad parts (cheap material)?. Could it be an issue with other front end components?. The car has 173,000 miles on it.
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I've got about 27k on my GTI, and have just noticed some faint, but odd steering / power assist issues.
Relevant mods - koni coils. Have had these for about 15k, recently raised for winter travel, then lowered back to 24.25 ftg. Conti DWS with about 3k on them.
Anyway, other day (while in brief winter height) at parking lot speed, slight turn, I noticed a very faint pulsing through steering wheel. Was not there minutes later.
Lowered car back, drove for a few days, nothing unusual.
Drove from SF > LA yesterday and had an odd feeling at speed on freeway. It was like a bit of resistance turning the wheel off center. Almost like there is a center detent, which i have never noticed before. Once off center, all feels normal. It was super windy out and thought that was causing this, but continued throughout drive.
I don't think that this is the tires, it's more mechanical than that.
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This summer, my steering rack failed, and I had it replaced with a remanufacutured steering rack. All went well, until a few weeks ago I started feeling a pulsing effect when turning, usually when turning right. On a few occasions, the shaking has become severe. It is a back-and-forth effect, about three times a second. It is bad enough that it has triggered a power steering error on two occasions. I took it to the garage who installed the rack, asking them to have a look at it, and they found nothing. Because the effect is regular, I am assuming that I am feeling the 12V power assist malfunctioning or reacting to faulty input.
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I bought 09 GX-470 4K miles ago..has 50K on it. Ran perfect when we bought it. wife said it started doing it 1 week later. I drove it and felt like warped rotors to me. replaced front rotors and pads with cheap wearever brand...I Know...I was sort of trouble shooting..did nothing ...did the back rotors and pads and seemed to fix it..did proper bed-in of new parts but, never checked at speeds above 55mph. recent trip got us up to speeds above 55... at these faster speeds when brakes are applied we get a nasty wheel wobble and a pulsing pedal...braking below 55 it feels fine.. thought's ?? last car was a 4runner which has the the same rotors and pads and never had a problem...could it be ABS ?? should I go with new oem rotors and pads ?
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My power steering started to make noise. I checked the power fluid and it was empty. I refilled it and noticed a leak.
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When maneuvering our LS forward or back, we hear a BONG sound as if you were plucking a violin. The Lexus dealer says it's due to the fact that the accelerator pedal is designed differently from previous versions. Why should we be satisfied with an LS460 that makes constant noises!!!
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On the way home this evening the car, 3.0L TDi of 2006 vintage started making a rather loud and horrible whooooooooooOOOO noise - following the revs of the engine. Pulled in and the power steering failed...well..it came back briefly as the revs increased then went.
What do we think? PS pump? Did it lock causing the belt to make that noise as it couldn't turn the pulley, then die altogether?
Is the PS pump on the same serpentine belt at the front as everything else? I took the engine cover off and could see that the belt was still under what appeared to be normal tension.... What are the pumps like to replace?
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On my way to pick up my mother in law yesterday I noticed a strange whirring sound whilst at the traffic lights, thought that was a strange new sound anyway I guessed something was wrong so on arrival I noticed an oil like mark on the left hand side of the car on the wet drive. So it looks like I may have a corroded power steering line. Got the car booked in with the chap who does my vehicle repairs for me is this a difficult job on the V10?
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Wife driving R with around 1,800 miles. Car build date 10/12; engine build date 10/19/12.
Car shuts off at highway speed; red steering wheel indicator is illuminated (not flashing) indicating power steering failure. No gauges, radio, other electrics work. I know about the "electromechanical" power steering set up, but is this the cause or the result of a possible water pump failure?
Car was just towed to dealer; dealer said they will diagnose in the morning.
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I have an oscillation in the steering wheel at speed in a turn. Feels like the pump is trying to straighten the wheel then gives up then trys again then gives up etc etc..... The oscillation is slow so its not like the wheel is shaking or about to fall off. The faster you go the more pronounced it is the tighter the turn the more pronounced it is. Doesnt matter left or right. Seems like its there at any speed but just gets worse the faster you go.
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My 2006 Sonata V6 (88k miles) has an occasional power steering loss. It has only been noticed right after slowing down from highway speed. Total loss for a few seconds then comes back. No dash lights or noises, just cant steer - then can. Did all required maint. until 60k then just oil changes by me. Have read other forums about fluid flush, but that was for noise and I don't have any noise. This has happened with and without the Electronic Stability Control turned on. Other than that, runs great. MPG is about 25 or so (wish was 30 or so).
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