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Re: 99 Suburban steering box???
Check your collapsible steering column. They are a two piece design and one collapses inside the other on inpact so the driver will not be inpaled on the steering shaft.. When they are loose it creates play in the steering wheel. I think GM may have a service bulletin on it but I am not sure.
If no trouble found it may be the valve in the steering box.
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I just had a similar problem, my 99 burb would lack power, almost like someone took its breath away. I put in a new mass airflow sensor and it runs like its brand new. pulled my 30 ft camper 500 miles with all the power I needed
Some times just putting pressure on the steering wheel either left or right turnwill allow the key to be turned. What happens is corrosion sets up and does not allow the steering wheel to turn completely to its index position. Just jiggling it back an forth will allow it to index. After you get it to turn properly, squirt a little WD-40 into the key hole and work the steering back and forth while turning the key.
If the OEM one is no good I would take a gander over on ebay and see if someone sells an aftermarket unit which you can buy and bolt on yourself. If not you can cheaply buy a used but as yet unfogged one, bolt it on and just wait for the fog to slowly return.
I was having the exact same problem as my brake switch was fine on my 95 suburban. However upon further inspection the problem was very simple i felt really dumb once i found this: the wire harness that comes away from the switch witch is a bundle of white wires that comes down and across the under side of the steering column had 2 damaged wires upon repairing this i have had no problems since then feel free to email me on this problem at firstname.lastname@example.org as i will do my best to help u out. But the problem is most likely a wire short out, or damaged wires for the normally open circuitfor your brake switch.
There is an adjustmen screw on the opposite end of the pitman shaft. If the box is behind the frame There should be an access hole. Raise the veficle off the ground, front wheelsno load. Loosen the adjustment screw and and turn it to the right holding the lock nut.. Move steering wheel back and forth to help take your adjustment. When you feel you have taken up all the slack, turn your steering wheel from one extreme to the other, fulll left and right while feeling for any binding or sluggishness. If you are adjust too tigh, the steering may bind or not return on or after a turn. Ok, O play in pitman shaft. Back adjuster off 1/4 to half turn and lock down with nut. Cycle steering again, full L & R.. You should be set Now lower the front end, cycle steering again and make sure it is smooth and consistant. Check all other steering componants for excessive wear and play before adjusting the box. Repair other defects found. Be cautious in turns until you are absolutely sure the steering will return on its ow. Tets, test, test !!!! Ned
The pressure regulator is located on the left side; driver side common rail -- however, that is most likely not your problem. You either have a bad check valve in the fuel pump inside the fuel tank or you have a fuel injector staying open...and leaking fuel pressure. The regulator only works when the vehicle is running.
A common problem with this model. Its the sterring speed sensor.A small disc shaped switch at the bottom of the steering shaft next to the floor. IT actually slips over the steering shaft, so, you'll have to disconnect shaft,pull column back towads you to replace. The reason for this switch is to stiffen steering at higher speed.Once it goes bad it starts sending mixed signals to the steering box. A simple fix? Unplug it at the switch like I did mine after I replaced it the second time.