Knocking with turning

Now that it has been colder outside, i have noticed that when i turn the wheel fully in either direction, a knocking noise is made. Only at low speeds. Can feel it through the steering column. Noticed this post on Renntech, and there is a TSB on this for 05 models Has anyone had this problem on 04 models?

does it do it when you stoped and turn the wheel lock to lock ?

Sounds like CV joint perhaps - what was the TSB about for the 05s?

o5s were for the springs unloading while turing the wheel does not apply to 996s

Brad, you think CV is a possibility here? Maybe a damaged CV boot lost all it's lube?

no i dont I have never heard a noisy cv on a porsche its not impossible but highly unlikely

C'mon, need more info. What type of suspension, how many miles, does it occur on flat surfaces or in and out of driveways or going into or out of a turn?

Are we safe to assume it is a C4?

check the power steering fluid level (pentosin)

Thanks for all the replys - mine is a C2 with 15 K miles It sounds like a "thunking" noise coming from the suspension/front wheels. It does not occur when at a stop and turning the wheels fully side to side It is noticable only when turning at 5 - 10 mph, and only when the wheel is almost at full lock to either side. Checked the power steering fluid level, when hot, it registers between the cold and hot marks

does it go thunk thunk thunk thunk as the wheel goes round, or just one thunk as you get to full lock?

check the sway bar links top and bottom to see if they are loose

Thunk thunk thunk as you near full wheel lock, but not when wheel straight and starting to turn

I've had a few cars do this when shod with hard warm weather tires in cold weather. As the wheels are turned, they are no longer parallel to each other. The outside(of the turn) wheel attempts to hold traction as the turn radius decreases. It then slips or jumps to compensate similar to a shudder. Is this what you are experiencing?

I'm still thinking a failing CV joint, thunks as the wheel turns, but only when at hard lock. Would the sway bar thunk thunk thunk like that Brad?

I still couldnt belive it is a cv, DO we know is the car a c4 or a c2? stop you car and turn the steering whell to the position that the car makes the noise check the tires for conact with the inner fender. if its a c4 also look at the fron axles for torn boots

I thought he has a C2 so no front CV's.

You are correct - missed that one Have you jacked up each side, and checked each wheel for play? Typically, if you grab each wheel at the top and bottom, and pull back and forth, you shouldn't feel any play when they are in the air.

Dave - certainly this may be the case, as i have never had a car with summer tires on them, usually my prior cars have had all season. This problem i had not noticed until it got really cold here in New England a few weeks ago. I am hoping that as the weather warms, it goes away, otherwise i hope the warrenty still covers the other potential problems mentioned

lower-control arm.

One way I believe to rule out things others have mentioned is to describe how the car handles/behaves during normal driving, both at speed and around town cruising. Does the car seem to wander(requiring constant steering input to keep it on track)? Does the car track straight and true? Do you experience bump steer(the tendency to of the car to choose a different direction over bumps)? Are there any "thumps" or odd noises when turning the steering with the car in reverse? Does the car vibrate or make any noises during acceleration or braking? I'd find it odd for your car, an 04, to have any symptoms of suspension/steering wear as would be indicated by what I've questioned above(although it wouldn't be unheard of especially not knowing the miles or condition of the roads you drive on). Have you taken the car for a spirited 10-15 mile ride(to get the tires a bit warm) and then checked to see if it still occurs? Did it occur when the temps outside were well above freezing? Finally, what tires do you have on the car?

This is my first p- car, and i have logged about 2 k miles on it. It does seem to track straight and true when on the highway and around town, No other noises. I will drive it with the tires warm and see