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2008 Mustang Gt - No Steering at High RPM

1188 Views 5 Replies 5 Participants Last post by  MasterX
I have a 2008 Mustang GT that has been turned into an SCCA T3 Racecar. Took it to it's first test day, and first session the car ran flawlessly. Second session, the car developed a power steering issue at high RPM. Anything below ~4800RPM, and the power steering works fine. Anything above ~4800RPM, and the steering cuts out completely. It doesn't just lose power steering, but goes into complete steering lock. Steering resumes once the car drops back down in RPM. The rack, pump and lines were original with about 35,000 miles on them. Flushed the system a dozen times, and replaced the pump, but the problem persists.

Any ideas?
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I once had a '95 Probe GT (Yeah, I know) and the rack started to malfunction.

It would seem to lock up just as I'd come to the exit ramp, or just as I'm entering the decreasing radius part of an exit ramp. Hair raising at highway speed. It would work fine at street speeds, and on the freeway with small steering inputs, but making high speed maneuvers was close to impossible at intermittent times. I found I could apply enough effort to steer the car, (pucker factor off the charts) but it took a lot of effort.

As I remember, it would happen just after a downshift, so the revs were up.

It turned out to be debris in the system clogging some valve that would not allow PSF to flow in either direction at the correct volume. One trip to work, and one trip home with that happening was more than enough for me. My mechanic at the time suspected what was wrong based on a TSB about that model of rack & pinion system. He flushed it out and I never had another issue with it.
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