GM Service Manual Online
For 1990-2009 cars only

Rattle or Knock in Steering Pump

Step

Action

Value

Yes

No

1

Inspect the pump pulley.

Is the pump pulley loose?

--

Go to Step 2

Go to Step 3

2

Replace the pump pulley. Refer to Power Steering Pump Replacement .

Does the rattle or knock in the steering pump continue?

--

Go to Step 3

System OK

3

Check the rotor slots.

Are pump vanes sticking in the rotor slots?

--

Go to Step 4

Go to Step 5

4

Remove burrs, varnish or dirt.

Does the rattle or the knock in the steering pump continue?

--

Go to Step 5

System OK

5

Check the power steering pressure hose.

Is the power steering pressure hose touching other parts of the vehicle?

--

Go to Step 6

System OK

6

Adjust the power steering pressure hose position.

Does the rattle or the knock in the steering pump continue?

--

--

System OK