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Olds Silhouette Engine and Transmission Problems

I have a 2000 Olds Silhouette that has taken on a life of its own. I can drive down the street at 50 mph without pressing on the accelerator because it is idling so high. When it is in drive with my foot on the brake it is at 1500 to 2500 rpm and in nuetral it is at 2500 to 4000 rpm. I can get this to resume a closer to normal rpm measurement by restarting the car several times until it resets itself. The TPS has been replaced although the computer is still reading this error message. There has to be some sensor that is bad and causing this problem, please help.


  • Hello ! I am having the same problem.
    I replaced the Idle speed module and that did nothing.
    I also had the throttle body cleaned and changed the pcv valve thinking it is a vacuum issue. It obviously has to be sensor related as it resets when I turn off the engine and wait 10-30 seconds.

    If I rev the engine in neutral it gets to about 3,400 then oscilates up and down and won't go any higher. Have you found a solution yet? If so please advise.

    Andrew H hessongaj AT gmail dot com
  • cvigil1cvigil1 Posts: 2
    We just had the Throttle position sensor replaced and so far so good. It has only been a few days but I have not had the problem since then.
  • I have a 2000 also and had the same problem. replace the fuel pressure regulator. I did it myself. cost about 70 dollars.

    Good Luck
  • mycar10mycar10 Posts: 1
    I have the same problem. High idle occurs at high tempertures. Have you found a solution?
  • My 2001 does this also but it only seems to happen sporadically. I was thinking I had a vacuum leak but I really don't have a clue.
  • cchicchi Posts: 2
    I have a front drivetrain vibration I can't fiqure out. I have changed both driveaxles, still there. It changes with speed and dips in road and also when I turn right but not when I turn left. Any ideas?
  • I have a similar problem. See this info I posted on the "Quick Technical Question" forum:
    "Problem with 2000 Olds Silhouette minivan with 88k miles.
    I have a vibration driving above 40 mph. It seems like a pavement vibration with a frequency about that of the off the road indicators if one goes too far right (but not that pronounced). I have replaced all tires with a front end alignment, all four hubs, and tie rod ends. The problem is worse on left turn curves, going up hills, and with heavier loads (three or more passengers). Has anyone else seen this?"
    The only response was to have the CV joints checked. I have not done this yet.
  • I have a 1999 Olds Silhouette Premier it has 78,000 miles on it and has been running flawlessly for the last 8 years the temp gauge was consistent at slightly above 1/4 mark and never moved. About 4 weeks ago the temp gauge started to fluctuate between 1/4 and 1/2 the temp gauge moves visibly while driving.
    - 1st time in shop replace water pump due to a leak.
    - 2nd time in shop temp gauge continued to move between 1/4 and 1/2 and then over temped again. This time the heater went from warm to cold as temp rose then warm when temp went back down. I replaced the thermostat.
    -3rd time in shop radiator is losing coolant 1/2 to 3/4 gallon. Did block test no leaks, changed oil (no water in oil), checked radiators (front and back) no issues. put sealant in coolant to plug any hair line fractures. chassis is bone dry.
    -4th time in shop - over temp...temp gauge fluctuates between 1/4 to 1/2 lost 1/2 cup of coolant. chassis still bone dry. another block test no leaks. tested for Co2 in the engine compartment and around the radiator - result clean.

    Has anyone experienced any of these issues? What should the next step be? The mechanic said the next step is to start tearing down the engine. They don't want to but said they have exhausted all other external symptoms they know about.

  • eodkideodkid Posts: 8
    These mini vans are famous for intake manifold leaks. They are on the back side of the engine by the firewall so they are difficult to see but if you are running hot and losing coolant I would check that. Mine didn't have any visible leaks but I could smell coolant and apparently it was burning off when it hit the hot engine. Good luck.
  • I have a 95 olds sihouette with 75K.At about 70-75 mph it will have a vibration in it untill I take it out of o/d.This does not happen all the time.Has anyone else had this problem and what do I need to do to fix it.
  • Thanks I will try that. I also think there has to be an air bubble in the line somewhere that is impeding the flow....Will keep you posted.
  • bhoughtbybhoughtby Posts: 1
    I have a 97 Olds Silhouette. The other day when backing out of the garage, I put it in reverse and it didn't seem to engage, I then put it in neutral and then drive and it wouldn't engage. I put it in park for a bit and back in reverse, still would not engage, I gave it some gas and the it made a loud clunck and engaged all at once. It has done this for the past few days now, but only when cold, doesn't do it through the day after driving for a while. Any ideas?
  • fordfan_17fordfan_17 Posts: 175
    sounds to me like the converter drain back valvle is stuck open and allowing the torque converter to drain back into the sump when the vehicle sets overnight. I am assuming since i dont have my books right here with me that this is a 4T65E transaxle and thier is a known issue with this unit. visit and look up the fixes for your transmission
  • when driving [all temperatures read normal ] there is a noticeable whine coming from the trans.shifting then becomes quite harsh . Sometimes if I stop and shut it down , sit for 3-5 minutes start on my way again ,everything is normal . There are 187,000kms on the unit and I had the trans fluid and filter changed at about 160,000kms prompted by this problem . Is there a fix or am I looking at an overhaul .
  • pignessx1pignessx1 Posts: 8
    My 2001 Olds Silhouette did the same thing. It was a manufacturer problem. The dealership replaced my intake manifold.
    Good Luck
  • fish92fish92 Posts: 3
    I am having the exact same whining and shifting problem on my 2001 Silhouette. Most days it is OK, but then it starts doing it again. If anyone has had this fixed, please let us know what it was.
  • notme99notme99 Posts: 2
    I just purchased a 2002 Olds Silhouette and have since found out that when it rains, water leaks in on the driver side where the emergency brake is, infact that is where it seems to come from. I am assuming there must be a drainage problem somewhere(fingers crossed) but I am not sure where the drain hole would be.I am currently parking on about a 20-30* angle not sure if that stops the drain from working.I would appreciate any light somebody could shine on this problem for me.
  • oorobbyoorobby Posts: 3
    I have a 2003 '03 Oldsmobile Silhouette and it leaks water like mad. We bought it last winter and didnt notice till the first big rain that is lets water in to the dash and when you turn a corner it spills out on to your feet and pisses you off! It drained the battery once and had to get rusted relay switches replaced as they were rusted in to the on position for good and drained it. we have tried a tarp (scratces the paint) and clear slicone in the bottom part of the window is where it looks like there could be wateer getting around the bottom seals. But nothing has worked yet. there looks like some water collection inside the hood by the doors there looks like some space where water was getting in but i didnt have a long enough nozzle on the silicone gun.

    I will keep you updated
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