lic265

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?

99firehawk

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

cdodkin

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

99firehawk

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

cdodkin

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

99firehawk

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

Laura

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?

1999Porsche911

Are we safe to assume it is a C4?

oekodriver

check the power steering fluid level (pentosin)

lic265

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

cdodkin

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

99firehawk

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

lic265

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

Dave Howerdel

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?

cdodkin

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?