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Running out of Options

This is a discussion on Running out of Options within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by Nowhereman It happened. Had to go into San Jose for a med visit for my mother. Car ...

  1. #21
    Member 88gtman's Avatar
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    Quote Originally Posted by Nowhereman View Post
    It happened.
    Had to go into San Jose for a med visit for my mother.
    Car started to idle at 2500 and this is in pouring rain.
    On the way back, the engine light came on.
    It gave me a Po121 code and some crap about the throttle position sensor.
    Since I put a new one in two days ago, it now tells me that the computer has finally crapped out.
    I have one on order; (factory replacement)
    This better phuuucking work.
    New doesn't always mean it is good. If replacing the IAC didn't change the behavior of the car then apparently the old one was good and that was not the problem. Besides I find a lot of the aftermarket IAC sensors to be horrible. Will see what happens when you get the new PCM in as well. Here is some more info about the code by the way. OBD-II Trouble Code: P0121 Throttle Position Sensor/Switch A Circuit Range/Performance Problem
    Last edited by 88gtman; 02-29-2012 at 11:48 AM.

  2. #22
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    New parts do not always equal good parts. Can't tell you how many times I have installed brand new parts that didn't work right out of the box.

  3. #23
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    OP: Do you want a schematic posted?

  4. #24
    Member Nowhereman's Avatar
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    Sure couldn't hurt.
    That is the only failure I have had in 12 years of owning that car.
    If I look at it that way, I'm not that bad off.
    I plan on owning her for another 12.
    Be who you are and say what you feel 'cause people who mind don't matter, and people who matter don't mind.'
    -Nowhereman

  5. #25
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    Schematics for the TPS sensor and pinouts for the IAC and TPS. Need to dig deeper for an IAC schematic...









  6. #26
    Member Nowhereman's Avatar
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    Guess what?
    The new PCM came in, they installed it and took out the battery, they went to program it and..... same thing, they can't get it to re program.
    Can I shoot them now or should I just blow the place up...

  7. #27
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    did it work?

  8. #28
    Smiles for 9.5 Years cammed goat's Avatar
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    I'm beginning to think a connector may be broken inside a harness. Check the IAC and TPS harnesses for any discolorations inside them. And if they can't reprogram the ECM, then there is a short somewhere. Did the techs check the wiring at the firewall for any chafing/cut wires?

  9. #29
    Member Nowhereman's Avatar
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    Here is the current status.
    It has been isolated to a wire in a harness.
    They ate the cost of a new PTM and are now on the right path IMO.
    I'll talk to the service manager today.
    The owner of that GM dealer is a good friend and he heard that my WS6 is in his shop.
    Things are hopping now...LOL
    Actually, there is a module under the dash that when un plugged, the idle issue goes away.
    That is where the shop is focusing now; to see where this module interfaces.
    Last edited by Nowhereman; 03-07-2012 at 07:53 AM.

  10. #30
    Member Nowhereman's Avatar
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    Ok, the reason for the high idle was ............. a harness running under the battery was found to be corroded over time.
    Apparently one of the wires had been damaged enough to prevent the 5 volts from dropping as this harness distributed 5 volts to various locations.
    I'm not sure if this is just a bunch of hogwash as I will pick up the car today.
    The real battle will be when I get there as the service manager says his techs are into the car for a lot of time.
    I'm not being charged for the computer or the TPS.
    Still, why should I pay so much for their ignorance?
    Have you guys heard of a harness under the battery location that runs 5 volt ditribution?

  11. #31
    Spaz is My Mentor SMWS6TA's Avatar
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    Yes there are a couple of clusters that run from the PCM along the passenger side that drop down next to battery that cross over the front and connect to the fuses box.

    It is possible that battery acid could have gotten on them but I would think that the wire loom would protect it (that's its purpose). I would have them show me where it was, you should be able to see something unless they replaced the loom too.


    Now the wire hide mod might be able to prevent this from happening again, but I'd have to look at mine again to make sure.



    They may be comping you the PCM & the TPS as a way to make up for the labor cost. A new PCM coast around $350 (without flashing a program, add another $100) and the TPS is another $50-70 bucks from the dealer.

    When it comes to chasing electrical it can be pure hell tracing a short. I had a short in my steering column of an 84' truck that cost me $240 in labor for a $35 part. Took them 2 days to find it. And that was back in 91' when labor rates were a lot less then today's prices.

    Talk to them and see if they can cut you a break. Promise them a couple of future oil changes or something

  12. #32
    Smiles for 9.5 Years cammed goat's Avatar
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    Hopefully all will work out in the end.

  13. #33
    Member Nowhereman's Avatar
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    We agreed on 600 bucks total, which is reasonal.
    The car runs great.
    This morning I will open up the hood and review in detail just what they did with that harness.
    Actuallay in 12 years, thats the only major failure I have had with her.
    The other being the God forsaken window motor and headlight motor.

  14. #34
    Smiles for 9.5 Years cammed goat's Avatar
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    IMO, that's a pretty good service record. Your car didn't require many repairs in that time.

  15. #35
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    I still love this car more than anything coming out now....almost.....

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