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donandmax

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About donandmax

  • Birthday 12/03/1934

Previous Fields

  • Car Model and Year
    98 Deville DElegance
  • Engine
    Northstar 4.6L V8 (LD8/L37)

Profile Information

  • Gender
    Male
  • Location
    Colorado
  • Interests
    Motorhomes. Cadillacs,Traveling. The Northwest.

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  1. Your right its been running fine for almost a month and a half.. So replacing the tps cured the problem..Thanks to all
  2. Donald, Replace the throttle position sensor (TPS). It will not set a code. I'm 99 % sure it will fix your high idle. If you can catch it, you will find that the PCM is commanding the high idle because of an errornous, or spiking tps input. I have not had a problem since, it been almost 2 months. Regards, Frank I have a new tp sw. but I cant seem to get to the bottom screw that holds it in the dog bone seems in the way (or at least the bracket that holds it in) cant seem to figure out how to get that out of the way to get to that screw.Thanks for the tip Don Donald, remove the small elbow bracket and you can get to the bottom screw without removing the throttle body. I was able to go in at a slight angle with a magnetic torx bit. Be carful, don't cross thread the bottom screw and make sure you get the small alinement pin in the small hole at the thottlebody. Regards, Frank OK removed that bracket and installed the new TPS hope that cures my problem. Not too difficult a job lost some coolant when I unscrewed that small hose fitting but all in all a easy job.Thanks for your help. Don
  3. Donald, Replace the throttle position sensor (TPS). It will not set a code. I'm 99 % sure it will fix your high idle. If you can catch it, you will find that the PCM is commanding the high idle because of an errornous, or spiking tps input. I have not had a problem since, it been almost 2 months. Regards, Frank I have a new tp sw. but I cant seem to get to the bottom screw that holds it in the dog bone seems in the way (or at least the bracket that holds it in) cant seem to figure out how to get that out of the way to get to that screw.Thanks for the tip Don
  4. Mechanic couldn't find anything wrong so far it hasn't repeated itself. Hope it stays that way. I may have hijacked this thread if so I do apologize. But my symptoms were similar to Frank T but much worse.
  5. I cleaned the tb and the IAC, Map sensor, etc, My wife and I went for a ride in the mountains (CO) all of a sudden in 1st gear the car was going 50 mph in 1st gear. I had to put my foot on the brake(on and off) and ride it about 9 miles home. I pulled it into the garage with brakes smoking and stinking. Put it in neutral and the engine was running full bore. I immediately shut it down and let it set for 1/2 hr. Restarted it and it idled perfect drove it around town and took it to the garage who sold it to me. The mechanic rode it all over town and it ran perfect. The boss man said the IAC couldnt be the problem because it has only to do with idle and if the car runs wild like it did it couldnet be the IAC. Went to pick it up today and couldnt get it to act up. He told me something he read about the NS engine and found something about a valve with a orange rubber gasket around the lip. Its located right side of engine at the front of the intake manifold. He said if that sticks open the engine wil "run away" He doesnt know if GM did anything about this valve but the NS has a history of this happening My wife wont ride in it anymore because this is a very dangerous situation. I mean can you imagine this happening while going down 6 & 7 % grades down Vail pass and Eisenhower tunnel for miles. The brakes would burn out and we might end up going over the side..Iam darn scared of this thing And dont want to trust it. Its a beautiful car looks like new. But Iam thinking on parking it in the garage covering it up and maybe use it for a museum piece ! Oh yes no codes relating to this are showing. They checked the throttle cables and could find no cause for it acting like this. I'm still going to replace the IAC and TPS I hope I'm on the right track because like I said this is downright scary. I had no trouble before I cleaned the tb with tb cleaner. Aybody got any ideas ??.
  6. I use saddle soap on mine and finish it off with a leather conditioner...
  7. X2 on that one just had mine replaced with Goodyears and stripe is on the outside..Now thats class !!
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