Unpredictable Steering

[hootenholler670]

i ordered a bypass for the PS pump. $27 on amazon.

 

[1998_K1500_Sub]

i ordered a bypass for the PS pump. $27 on amazon.

It should include a new flow control orifice union and an adapter enabling you to connect the existing high-pressure line to the (new) flow control orifice union. If it doesn’t have both then it’s incomplete.



(edit) See the picture in my later post

 

[hootenholler670]

is it 100% required to remove the pump to install this?

 

[0xDEADBEEF]

I would trust the folks here to diagnose the pump, so I'm not commenting on that, but what you describe is actually called bump steer and is usually caused by incorrect steering geometry (although apparently not in this case).

 

[1998_K1500_Sub]

is it 100% required to remove the pump to install this?

As I remember (I did this repair long ago), yes. Removing the EVO from the back of the pump requires some room to work.

Maybe others had different experiences, and will tell.

(Edit) These are the parts you'll need (pictured). They usually come together as a kit.

You can assemble your own "kit" by buying the flow control orifice union from anywhere and then, instead of using the adapter (U-pipe, pictured), replace your high-pressure line (from PS pump to the gearbox) with one from a 1995 or earlier GMT400.

You must be registered for see images attach

 

[df2x4]

Personally I'm a little skeptical that a $27 Amazon kit will include the correct flow control orifice. I'd be more comfortable with the recommended GM kit.

What you got may be fine, but if your steering feels over or under boosted after installing then I'd be looking at that part.

 

[1998_K1500_Sub]

is it 100% required to remove the pump to install this?

You can borrow / rent the tool needed to remove the pulley, if you don't have it.

Tip: Get a proper-sized bottoming tap (Metric?) and use it to clean out the threaded hole on the inside of the PS pump shaft, b/c you'll need to thread the installer tool into that hole when installing the belt pulley.

 

[hootenholler670]

i do have issues with steering stiffness at idle speed. i bet that is some of the issue.

 

[Pinger]

Working properly, EVO steering is very light at low speed (including when engine is idling) and 'weighty' at higher speed - and utterly predictable throughout.

 

[Orpedcrow]

Working properly, EVO steering is very light at low speed (including when engine is idling) and 'weighty' at higher speed - and utterly predictable throughout.

Improperly working, EVO steering causes unintended lane changes when hitting expansion joints at highway speeds…