Steering Jerk

[98 YUKI]

I have a '98 4X4 Yukon w/ a steering issue. Normal steering when driving straight, but randomly when entering a turn, the pressure seems to release, as if no control (for 1 second) then will regain and seem to catch itself. If you don't know what it's doing it will scare the sh*# out of you, because it feels like the steering shaft let go!
Local mechanic seems to think balljoint, but never took the liberty of test driving before rendering his dianosis.
No unusual vibration during driving. No steering slack (in a straight line). No leaky pwr steering pump. Ball joints appear normal, but haven't taken apart to inspect.
Feels like steering box is missing teeth.

 

[t.ebentheuer]

its the EVO sensor that is on the steering shaft under the dash. Just make sure to disconnect the battery and pull the ABS fuse so your airbag doesn't go off when you replace the sensor. Its a pretty easy job. Cost me about 40 bucks for mine at NAPA.

 

[96ProCompTahoe]

:iagree:

 

[Whippled2dr]

I agree. Here are the directions I used and a pic of under my dash of where it is.

Its the plastic looking thing in the pic.

I got these instructions from another site:

This job takes about 15 minute.
Tools Needed:
15mm box wrench or socket & ratchet handle, small flat screwdriver, flashlight or trouble light.

1. Find the bottom of the steering column inside the truck, it's about 6" or so aft of the firewall. Ahead of the column, you'll see the steering shaft with a bolt and nut through a clamp.

2. Start the truck, and turn the wheel so that the nut points to about 5 o'clock.

3. Stop the truck, and disconnect the negative battery cable.

4. With the wrench or socket, loosen and remove the nut and bolt from the steering shaft clamp.

5. Slide the shaft forward far enough to get about an inch or so of free space at the end of the shaft.

6. Looking at the bottom of the column, you'll see a plastic ring about 1/4" thick. It could be black, tan, or blue in color. That's the EVO sensor.

7. Move your hand up to the top of the column, you'll feel the EVO wire harness as it runs along the top of the column. Move back about 4 inches or so until you feel the connector. The harness and connector are wrapped in foam tape, so pull enough of it away until you can see both sides of the connector. With your small screwdriver, gently move the connector lock until you can unmate the connector by pulling on the sensor side of the harness.

8. Pull the sensor from the bottom of the column. You might need to use your screwdriver in the seam between the sensor and steering column to get it started.

9. Replacement is the reverse (of course) of removal. When you replace the sensor, note that it is keyed and has to enter the column with the wiring harness on top.

 

[cny1320]

Thanks for the info. I have the same problem. Its scares the crap out of me when I'm in a turn on the highway!