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Power Steering

kfehling

Well-known member
Joined
May 8, 2001
Messages
83
Location
Santa Rosa, CA
Corvette
1996 Collector Edition
I have a 1996 CE LT1 that, on some mornings, has labored steering. I have not noticed any unsual sounds nor have I observed any apparent trend (e.g. cold mornings, sitting in the garage for a couple of days). It does not happen immediately on start up, rather, it takes a few minutes to develop. Unfortunately, I have not had this happen during long drive events. Somehow, I am just about to arrive at my destination when it occurs so I do not know how long it lasts. I can tell you that by the time I leave, a few hours later, it does not occur. I guess this indicates at least one trend, it occurs after being parked over night. Finally, the power steering fluid is fine. Any ideas would appreciated.:(
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,237
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
OOPS!!

Sorry man, I didn't know that no one had responded to your question. :eek:

You've discovered what is commonly referred to as "morning sickness", a low groan that occurs when cold. ;)

Back in the 1980s, the early GM racks, along with similar racks from other vehicle manufacturers, often developed a problem known as "morning sickness." The steering would feel hard and stiff when a cold vehicle was first started, but normal power assist would gradually return as the vehicle warmed up. The problem was caused by wear in the spool-valve housing. The hard teflon rings on the spool valve wore grooves into the relatively soft aluminum housing, allowing pressure to leak past the rings. The cure was to replace the rack with one that had a sleeved housing or a cast-iron housing.

In 1988, GM began switching to racks that had cast-iron housings. This cured the morning sickness problem, which over time has reduced the demand for rack replacement. Even so, power racks are still subject to wear and to developing leaks. That’s why time should always be taken to inspect the rack when under a vehicle doing other repairs. The rack should also be checked anytime a customer has a steering-related complaint or the tires show signs of toe wear.

*Conditions to look for include steering play, poor steering return, steering harshness, loss of power assist, noise, memory steer, fluid leaks around line fittings or the pinion seal, or fluid in the bellows.

While this symptom usually disappears as the engine warms up, it’s a good warning sign that your car’s rack and pinion system could use a check up. A stiff power steering rack unit is a safety hazard, and should be replaced.

_ken :w
 

kfehling

Well-known member
Joined
May 8, 2001
Messages
83
Location
Santa Rosa, CA
Corvette
1996 Collector Edition
Thanks for your thoughts Ken. However, it appears that the only symptom that my car has is the infrequent loss of power assist. No moaning, no play, no leaks. It only has 47,000 pampered miles so I really hope that it is not a bad rack. Unless you feel otherwise, I was going to try to flush the system a couple of times and add some high quality fluid along with a teflon additive. My local shop suggested this as the first try. Any thoughts?
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,237
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
Definitely try that first! If you can flush it completely it might extend the life of the unit, but everybody goes through it eventually. ;)

Good luck.

_ken :w
 

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