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Cadillac ATS Technical Discussion Forum Discussion, Trembling at idle in Cadillac ATS Discussion Forums; Hoosier daddy. I have posted numerous issues on this car. How long a test drive you need at approximate 500 ...
  1. #166
    Muffin is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    Hoosier daddy. I have posted numerous issues on this car. How long a test drive you need at approximate 500 miles it starts this issues I take it back because I sir have had many a new car and o by the way own a 57 Chevy 283 engine and it far smoother than this 40k car.i have gone thru the proper channels right thru to the district man for cadillac.you may like to drive your car with trembles and shakes that's your decision.i had a pt cruiser for 11 years and never experience anything like this.sonas a cadillac owner and a way step up to this car I expect better and not expect anything less.i have had a personal chat with service mgr and he assures me that the turbo now is smooth and he got one for his wife.so I think cadillac can either fix there 2.5l. Or step up and get me into a turbo. The quality I deserve since I pay the bill.i am sick and tired of customers excepting inferior cars from our American company's we deserve better and GM needs to assure us no matter if we test drive a car or not. They should have quality tested this engine not just throw it out there and we the consumer suffer.

  2. #167
    Hoosier Daddy's Avatar
    Hoosier Daddy is offline Moderator
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    Re: Trembling at idle

    Quote Originally Posted by Muffin View Post
    Hoosier daddy. I have posted numerous issues on this car.
    Focus. Look at your post count.

  3. #168
    bravnik is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    I experienced the tremble a few times but not any in a while. I had my oil changed at 1000 miles and sense the change no issues with idle. It's got a bit warmer here but still very cold in the AM. I have even stopped warming my car up while I get ready for work and just go out, start and go. No issues at all.

    How many that have the issue have yet to do their first oil change? Maybe it will help? I try to do my first one around 600 to 1000miles because I'm old school and that is how I have always done it.

  4. #169
    Muffin is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    Ok will try this on the 2.5l. Hope it does the same for me as it has done for your turbo. Thanks

    ----------

    It's in another forum. Thanks

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    It must be another forum. Thanks

  5. #170
    TonyT's Avatar
    TonyT is offline Cadillac Owners Fanatic
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    I have had this happen in my 2008 CTS 3.6 a few times a year, it's starts to tremble feels like it will almost stall, then after about 15 seconds its right as rain. I never thought of it as a problem because it happens so infrequently.

  6. #171
    rsingl is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    Tony,

    Like you I have a 2008 CTS 3.6DI but I have never noticed a stall or tremble at idle. Fairly consistently from a cold start after a few seconds the fast idle RPM will start to drop and then immediately revert to fast idle before waiting a few seconds and then starting to drop in steps to base idle. It isn't really a problem but this little glitch is very noticeable and it does make the engine control system seem a bit incomplete. For those who start the vehicle and immediately put it in gear it probably isn't noticed but I like allowing the engine to warm enough to reduce idle speed before shifting out of park.

    It is an entirely different engine but by comparison the 6.6 turbo diesel in my 2006 GMC Sierra is quite a bit smoother and just about as quiet. A nice thing about the diesel is it doesn't need to fast idle from a cold start and the only time it does is when the temperature is below 28 or so and it utilizes fast engine warmup strategy. It starts at normal base idle and after 30 seconds begins slowly ramping up to a 1,200 RPM fast idle in 50 RPM steps. The variable vanes in the turbocharger are simultaneously moved to increase back pressure and the transmission output shaft is locked but the input is loaded to also put more load on the engine. It works very well for fast warmup although it sounds like a little jet engine during this strategy. As the temperature increases the idle RPM begins to ramp downward and drops to base idle as soon as the brake pedal is touched. Obviously some pretty well thought out programming went into this process and it would be nice if the 3.6DI was as sure and solid during its initial cold RPM control.

  7. #172
    jeffc83's Avatar
    jeffc83 is offline Cadillac Owners Connoisseur
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    I call it "auto backup mode"...lol. I do have to put it into reverse as soon as I start the car in order for it to work but is a nice feature. I say take advantage of the glitch!

  8. #173
    rsingl is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    Nice to know it is consistent across the 2008 CTS I had the flash to revise the oil life calculation but otherwise it is the original software. The only real annoyance I had with mine is I have a late production 2008 which came with bluetooth and when the OnStar module was recalled and replaced the dealer used the earlier module even though I specifically noted on the service order mine was bluetooth enabled. The first response was that they forgot to "flash" the new module and of course it still didn't work since it wasn't the correct module so for the third trip for this supposedly simple recall I wrote an explanation using mostly single syllable words and they finally ordered and installed the correct module.

    Prior to this the dealership has provided excellent service over a 20+ year relationship but this was not a stellar service encounter.

  9. #174
    jeffc83's Avatar
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    I have a mid production model and didn't have the bluetooth. When I installed the new VCIM, I put a sticker on it that describes what it is and states DEALERSHIP: DO NOT TOUCH, USER REPLACED PART. I also did that with the heated wssher system...so far so good.

  10. #175
    probee773 is offline Cadillac Owners Member
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    Re: Trembling at idle

    Quote Originally Posted by probee773 View Post
    I had the ECM update performed last week and no hiccups so far. I'll let you know if they return...
    Ok, since I had the ECM updated, we have NOT had any more hiccups (feels like a misfire). However, the generalized trembling at idle seems to have gotten worse. I'm not sure if it is as simple as the idle being set too low. For example, I can get the tremble to go away if I hold the brake down with my left foot to keep the car stopped and slightly press the gas peddle with might right foot to bring the RPMs up a little.

    Any private tuners want to provide input here? Maybe there is a software tweak that can be done cheaply to raise the idle RPMs slightly. I would pay for that. The fix from GM might take a while... corporate bureaucracy and red tape...

  11. #176
    myronf is offline Cadillac Owners Member
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    Re: Trembling at idle

    Out of curiosity, what speed is it idling at?

  12. #177
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    Re: Trembling at idle

    Quote Originally Posted by TonyT View Post
    I have had this happen in my 2008 CTS 3.6 a few times a year, it's starts to tremble feels like it will almost stall, then after about 15 seconds its right as rain. I never thought of it as a problem because it happens so infrequently.
    That may just simple be a case of dirty gas or water that works it's way through....I wonder sometimes how many of these problems could be a result of inferior and crappy gas....

  13. #178
    CADILIKENYC is offline Cadillac Owners Member
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    Re: Trembling at idle

    My 2.0T idles at 700 rpm, and has stalled 3 times today alone. my car has 150 miles on it. its very hot here in nyc and it stalled 2 times at a red light with ac on full blast and once while filling my car with gas. My car is a manual tranny. Not sure what to do. if it continues i will bring it in.

  14. #179
    bungee91 is offline Cadillac Owners Fanatic
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    I currently have a data recorder from GM installed for random stalling that has increased to a couple of times a week during decel or stopped at a light. I'm hoping to have an answer in the next couple of weeks. Apparently GM is shut down for the next 2 weeks or something during the holiday.

  15. #180
    JavaGirl is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    I just got my 2014 ATS yesterday. It was one of the first ones off the 2014 assembly line which started production on June 10. It was 110 degrees here in California yesterday, and I took it for a test drive. Started it up, put the A/C on full blast, and went to some stop lights and stop signs to try to get it to stall. It was perfect. I also really hammered it down when pulling out of one of the stop lights. It was perfect; no problems at all.

    My 2014 was idling at 750 RPMs.

    There is NO vibration at all in the cabin. I popped the hood and put my hand on the top of the engine (surprisingly HOT) and I could feel it vibrating somewhat. However, this vibration was completely isolated/damped out before getting to the cabin.

    If someone says vibrations are "normal" in the cabin of the car, they have not driven a nice ATS.
    Muffin likes this.

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