1998 Tahoe

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  #1  
Old 11-06-03, 06:53 AM
MARYLM
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1998 Tahoe

Every once in a while the truck jerks to the right. It usually happens at 30-40 mph and when the road is curvy. Do you have any ideas? I've had it check out, but since it doesn't do it all the time they haven't come up with an answer.
 
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  #2  
Old 11-06-03, 07:05 AM
Joe_F
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Need some history on the vehicle and what has been done. Have you checked alldata.com for any bulletins?
 
  #3  
Old 11-06-03, 06:18 PM
crt8
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jerking feeling

MARYLM,the jerking you are getting does it feel as though you
are losing the steering feel? if so it is most likely an intermittant
steering wheel speed sensor(evo sensor).This part may or may not set a dtc in the vehicle computer,but in most cases of loss of
steering feel this is the cause.
 
  #4  
Old 11-06-03, 11:19 PM
mike from nj
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crt8---explain that one for me, i've never heard of anything like that, i'm curious now, that's not related to 'speed proportional' steering is it?

marylm, first make sure tire pressure is set to the pressure listed in the driver's door jamb sticker with a good gauge, not the max pressure listed on the tire.
 
  #5  
Old 11-07-03, 04:35 PM
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Join Date: Apr 2002
Location: Pittsburgh,Pa
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It's called electronic variable oriface steering and I agree steering wheel speed/position sensor.Yes mike its speed related.The power steering pump has an actuator in the back that controls fluid flow/pressure in relation to vehicle speed.EVO codes are under chassis(on a Tech 2) so an aftermarket scan tool may not read them.I would not hesitate to replace the sensor personally.
 
  #6  
Old 11-07-03, 10:10 PM
mike from nj
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is this system used on a trailblazer?

i just had two days of isuzu ascender (trailblazer) training and heard no mention of this.

where is the sensor, on the column?
 
  #7  
Old 11-08-03, 04:50 AM
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Location: Pittsburgh,Pa
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I don't see it listed on that body style.If it had it yes the sensor would be on the column and an actuator at the back of the pump.I'm curious did the trainer discuss the 4.2L engine camshaft actuator system?
 
  #8  
Old 11-08-03, 02:02 PM
y01lfp
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I own a 98 GMC Yukon that is doing the same thing. What are approximate costs for replacement parts, which specific parts are recommended for replacement, and how long would it take a dealership or private mechanic?
 
  #9  
Old 11-08-03, 04:40 PM
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Join Date: Apr 2002
Location: Pittsburgh,Pa
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It takes a long time about an hour flat rate,parts I don't know.lol
 
  #10  
Old 11-08-03, 10:13 PM
mike from nj
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the CBT (cd-rom) i had to do to get into the class went into it pretty in depth. in class, we got the old finger point to the actuator solenoid and a very brief description.

the class was more geared towards electrical differences, ( like stuff we've never seen before), like the rear bcm/fuse & relay block under the rear seat, and the beautiful ribbon wire connecting the two.

so far, other than pdi, all i've done is low pressure cutout switches on the a/c, been problem free for a year now.

anything to look out for, like the 'phaser' system?
 
  #11  
Old 11-09-03, 07:05 AM
crt8
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evo sensor replacment/location

The evo sensor is located at the base of the steering column,
just above the joint where the steering column joins the steering
shaft.Replacment is fairly easy,with minimal tools required.Simply
removed the lock bolt from the shaft & slide the 2 shafts apart,
the sensor is held in place by 3 clips located on the lower column
bearing,release the clips using a small pick,disconect the electrical
conector(usually located on top side of column) & slide the sensor
off of the shaft.Align the locating tab on the new sensor & slide
back into place,reconect electrical conector & steering shaft.Due to
the fact the sensor operation is usually intermittant it is not
necessary to clear codes.Hope this helps out.Parts cost are about
$100.00 Canadian,& yes the trailblazer does use a similar system.
 
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