There are two types of codes: Permanent are those faults which occur all the time, and intermittent are of course those that occur irregularly. All will clear whenever you clear the system, it's just that those permanent conditions cause the same problem right away the first time you start the car after clearing.

P0120 is "Throttle position function incorrect" and will always appear when the car's gone into limp home mode.

I've had one TCS car that would drive fine until you gave it more than 50% throttle, then it would clonk into limp home mode. Replacement of throttle body cured the problem. Sounds like you may be in that same boat.

Remember the warning that the system must have the correct command codes entered via ISAT or Tech II before AND after the TB is replaced, or you might fry the replacement TB.

You can try a used original-part TB if you wish, provided that the source can vouch that it was operating properly. Alternatively, sounds like the reconditioned units have earned a good reputation and are reasonably priced.

If you're in the New Haven, CT area you could stop by my house some weekend for a scan.

posted by 155.212.49...

• TCS Throttle Body probs on '95 Aero, replaced vac, EricG, Tue, 17 May 2005 00:57:58
  • Fixed!!!!!! Story above! n/m, EricG, Wed, 18 May 2005 16:57:36
    • Can't find it above???? N/M, Ron J, Wed, 18 May 2005 18:13:54
  • 'Hard' vs Soft code, EricG, Tue, 17 May 2005 12:30:17
    • Permanent vs. intermittent, David Ingram, Wed, 18 May 2005 07:11:39 <-- Viewing This Message
  • Remember, the vacuum line diagram on the fender, RayV, Tue, 17 May 2005 09:02:04
    • Thanks! I did not even realize the diagram was on the, EricG, Tue, 17 May 2005 12:18:19
  • Need more info., Ron J, Tue, 17 May 2005 08:47:25
    • 78390 is ETS code, and valid in my book., EricG, Tue, 17 May 2005 10:53:09
      • Re: 78390 is ETS code, and valid in my book., Ron J, Wed, 18 May 2005 08:15:35
        • It's too simple or I am! Really think needs recal., EricG, Wed, 18 May 2005 10:29:03
          • Something Simple to check........., Ron J, Wed, 18 May 2005 15:32:32
            • Want to make EASY CASH???????, Red, Sun, 31 Jul 2005 21:10:39
  • It may be time for a TB. I was able to get a great, Winder, Tue, 17 May 2005 08:19:23
  • Re: TCS Throttle Body probs on '95 Aero, replaced vac, David Ingram, Tue, 17 May 2005 06:04:07
    • Sorry....misread your post...., David Ingram, Tue, 17 May 2005 06:05:40
      • BUT... DO Make Sure the Valve Is Oriented Correctly..., Peter Ingram, Tue, 17 May 2005 15:25:32
        • Valve's right. Wish I had a techII...N/m, EricG, Tue, 17 May 2005 18:06:50
  • Re: TCS Throttle Body probs on '95 Aero, replaced vac, tiziano, Tue, 17 May 2005 04:13:42
    • Thought about the silicone lines, but they're thick!, EricG, Tue, 17 May 2005 07:38:37
      • Different types of silicone hoses, Bill Homer , Tue, 17 May 2005 08:42:02
        • Re: Different types of silicone hoses, tiziano, Wed, 18 May 2005 00:54:33

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