Diagnosis Help!

Discussion in 'General Chit Chat' started by Porkchop, May 19, 2011.

  1. Porkchop

    Porkchop The Black Sheep

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    Ok, so I feel more comfortable posting here than any GM forum I'm a part of.:wave: But my wifes car has started a very odd symptom... description as follows:

    Vehicle: 2004 Pontiac Grand Prix GT 2

    - Only makes noise when turning left on full lock
    - NO noise on right full lock or any portion in between
    - The noise sounds like a grinding noise, but nothing with he wheels is rubbing and when turning the car doesn't skip, hop or otherwise bind that I can tell.
    - The noise is speed dependant, so the slower you go the slower the grinding sounds and vice versa.
    - I checked the wheel wells for signs of rubbing and I checked the inside of the tire for bald spots, flat spots or any other signs of rubbing.


    I've already checked for a wheel bearing issue while driving and all is quiet. There is no shimmy while driving or while turning the wheel to the left while its making noise. The PS fluid was flushed by me about 1000 miles ago and I checked with the dealer to find the reccommended fluid to refill with.

    The car went to the dealer on Monday and all they mentioned for "problems" was loose steering, but of course didn't elaborate on it. When she got home I checked the steering and it didn't look or feel loose and the steering wheel to wheel movement looks normal.

    I originally thought it was a CV Joint but there is no clicking sound when turning the wheel.

    Anyone have any ideas?
     
  2. 2BadSHOs

    2BadSHOs Freday-day

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    Is that rack a Magnasteer? Does it shudder thru the steering column.cowl? Us G-Body guys (Aurora) get a severe shudder when turning left at low speeds (my Aurora does it pretty badly). The fix for our issue is to install revised by GM power steering pressure lines which are longer than the factory ones and in effect dampens the vibration/shudder before it gets to the column/cowl. Check for TSB's about that man.
     
  3. 32MTX

    32MTX New Member

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    sounds like a brake rotor/shield or a bearing grinding something, it could be inside the bearing, they have an integral abs sensor/wheel... which I really don't know what ti looks like on your particular car but that could really be something to look into.

    key words here are that the noise increases with speed.... so its something that spins directly with the wheel.... it could possibly be an axle as well, I have heard them screach and not go the normal clickety click sounds...... but usually those are new chinese ones that do that.....

    i can't tell u exactly what it is without hearing it myself, but if it changes in sound based on speed, its defintely a component that spins at the tires speed....
     
  4. SHOracer14

    SHOracer14 Me-0 Diffs-6

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    I assume you checked for play in the bearing. Kind of sounds like a bearing possibly. Even if there is no play still check for binding in the bearing by doing this. While front end is in the air and car is in neutral put your hand on the spring and spin the front wheel. COmpare both sides, if one side has more vibration than the other or excessive vibration felt through the spring, chances are you have a bearing issue. Because it only makes the noise on a hard left I would start with the left side (if it was noticeable on any turn to the left I would check the right first).

    The noise is a constant grinding or rotational noise, correct? Not a binding spot like with a bad strut mount (bearing) or intermediate steering shaft?
     
  5. Porkchop

    Porkchop The Black Sheep

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    Thanks for the input, to answer your questions:

    2Bad - Not sure if its magnasteer, but I can only assume. It doesn't come through the steering column and she has already had the TSB for the high pressure hose in cold climates fixed. She does have the "thunking" intermediate steering shaft which I need to address this summer.

    32MTX - Thats what I was thinking too is the axle, but again I have NEVER heard them grind instead of click. I checked the wheel bearing and did a driving test, at speed turn to the left and right and listen and nothing changed. I've had plenty of wheel bearings fail and they all had the same symptoms. I have not had a chance to get the car in the air yet. Wanted to try and figure out what to look for before I start going nuts. :shrug:

    SHORacer - When driving normally and doing normal turns (not to lock) there is no sound, nothing out of the ordinary. Only when at full lock when turning left does this sound come out. I checked in the garage when the car was sitting and turning to Left Lock and there was no sound at all, which doesn't lead me to believe its a steering issue (don't think at least). Like I said above, she does have a squeeking steering wheel when turning, but that has already been identified as the intermediate steering shaft under the dash.
     
  6. Bob Gervais

    Bob Gervais Wut?

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    I have a wonderful suggestion:

    Call the guy whose lot her car is parked in on some weekdays, and ask him to look at it. :)
     
  7. Porkchop

    Porkchop The Black Sheep

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    hahahah, cause by the time she is done, your gone!

    edit : Bob, PM your cell number:
     
    Last edited: May 20, 2011

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