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Cadillac ATS Technical Discussion Forum Discussion, Trembling at idle in Cadillac ATS Discussion Forums; Originally Posted by CADILIKENYC My 2.0T idles at 700 rpm, and has stalled 3 times today alone. my car has ...
  1. #181
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    Re: Trembling at idle

    Quote Originally Posted by CADILIKENYC View Post
    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.
    Hello CADILIKENYC,

    I apologize for any inconvenience you are experiencing with your ATS. I understand how this can be frustrating, after having recently purchased the vehicle. If you would like to further discuss your concern, please reach out to me via private message and include your contact information and VIN.

    Laura M.
    Cadillac Customer Service

    ----------

    Quote Originally Posted by bungee91 View Post
    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.
    Hello bungee91,

    I am sorry your ATS is experiencing a random stalling issue. If you would like to discuss your concern, please reach out to me via private message so we can further interact on your current situation.

    Laura M.
    Cadillac Customer Service

  2. #182
    Felton10 is offline Cadillac Owners Member
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    Re: Trembling at idle

    Noticed my 2.5 does it also. Most noticeable when I first start driving the car. Once the car is warmed up-almost never notice it. Mentioned it when it took it in for service and was told the engine was set to spec. so I guess that means everyone does it. Never got so bad that I thought the car was going to stall.

  3. #183
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    Quote Originally Posted by JavaGirl View Post
    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.
    Which drivetrain?

  4. #184
    Muffin is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    Oil change did not fix. Was a good effort tho

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    Re: Trembling at idle

    Quote Originally Posted by Muffin View Post
    Oil change did not fix. Was a good effort tho
    Ugh, Sorry man. I will admit I had the issue the other day with the AC on. Just a quick stumble but a stumble just the same. Hopefully they will come with a fix. When it happened I gave a tad bit of gas and it went away. Let off and it came back so that tells me it's an idle issue and simply needs to be upped a bit. I noticed that when it did this it was idling around 500 which it normally does around 700.

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    Re: Trembling at idle

    No problem we will keep trying thanks anyway

  7. #187
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    These VVT GDI engines are very different animals than what we have grown accustomed to over the past 25+ years of SVT MPFI being commonplace in most engines. So naturally they will behave differently while performing as they were designed. Increased fuel economy and HP, more evenly distributed torque, and lower gaseous emissions are the benefits of this new generation of engines; but these benefits are offset by rougher idling, more noise, and increased solid emissions in the form of soot. I am sure over the next decade most of these issues will be conquered.

    I am not saying that everyone complaining of rough idle is unfounded, but I am sure some people think something is wrong since the VVT GDI is noisier and rougher running than their old SVT MPFI's. After all, it does seem backwards that a better engine would act like a worse engine on the surface!

    BUT I have read on Lexus forums and Hyundai/Kia forums that there have been problems with sticking Oil Control Valves (OCV) even in brand new cars that have caused abnormally rough idling issues. At low rpm, overlap in open intake and exhaust valves should be minimal or zero. At higher rpm, the VVT allows the overlap to grow which is the beauty of the VVT. If the OCV sticks and doesnt allow the overlap to close out, low rpm stability can be adversely affected, even without throwing any codes. These faulty OCV's were replaced and problem was solved. It is a shot in the dark really for our Caddy application, but could be a culprit here!

    Below is a quote from an article on what the OCV does in the GM 2.5:

    "Impala’s 2.5L engine, which delivers SAE-certified 196 horsepower (146 kW) and 186 lb-ft of torque (252 Nm), achieves variable valve lift using an all-new rocker arm that switches between low and high lift intake cam profiles. The mechanism is actuated by an oil control valve through a dual-feed stationary hydraulic lash adjuster. It is the first of its kind for low friction roller-type finger-follower valvetrains in gasoline engines. The engine’s computer continuously selects the optimal lift profile based on conditions such as engine speed and load."

    ----------

    ...point being that if too much valve overlap is present at low RPM, exhaust from the open exhaust valve travels into the intake thru the open intake valve and mixes with the incoming gulp into the cylinder. The extra CO2 and CO in the incoming gulp causes an erratic rich mixture and too much fast variability for any buggy computer (not just Caddy) to keep up with compensations for a sticky OCV. Just saying it's a solid possibility.

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    Re: Trembling at idle

    Well that's all good stuff just wish I and fellow 2.5 owners were may aware before our purchase of ats I would have chosen the turbo. Thanks for that great info.

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    Quote Originally Posted by Muffin
    Well that's all good stuff just wish I and fellow 2.5 owners were may aware before our purchase of ats I would have chosen the turbo. Thanks for that great info.
    The turbo is also a VVT GDI engine, so same issues can still be found.

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    Re: Trembling at idle

    Interesting you say that because both service mgrs said that the turbo is completely different engine. Geez what's going on!i have test driven about 5 turbos and find not rough at stop lite a little vibration in park but nothing like the 2.5. Two different dealers same answer. What's up with that

  11. #191
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    Re: Trembling at idle

    Quote Originally Posted by Muffin View Post
    Well that's all good stuff just wish I and fellow 2.5 owners were may aware before our purchase of ats I would have chosen the turbo. Thanks for that great info.
    Everything you just read applies to the turbo and 3.6 as well. All indications point to the problem being as likely or more likely with the turbo as the 2.5.

    ----------

    Quote Originally Posted by Muffin View Post
    Interesting you say that because both service mgrs said that the turbo is completely different engine. Geez what's going on!i have test driven about 5 turbos and find not rough at stop lite a little vibration in park but nothing like the 2.5. Two different dealers same answer. What's up with that
    Of course they are different engines. But they have the same characteristics that cause the roughness for SOME of the motors.

    The fact that you found 5 turbos that were smooth is no surprise. You could drive fifty 2.5s and all could be smooth. I have to assume even your 2.5 didn't run rough when you test drove it. If it was rough then, you were happy enough with it to buy it. If it started after you bought the car, why would you think any other one that was smooth when you drove it wouldn't develop a roughness later?

  12. #192
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    Re: Trembling at idle

    The idle on our 3.6 is noticeably different than previous (non-DI) cars. Not "bad", just different.

  13. #193
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    Re: Trembling at idle

    Yes that's correct I had a short test drive up and down the highway and back to the dealer but didn't experience the rough idle.if I had known about these forums before I test drove I would have done the stop lite and sit there test but not the case.i assumed that cadillac had produced a supreme car.i shouldn't have to go looking for issues. Haven't had to do that with my other cars.trying hard daddy to assist with a resolution that's my goal also nothing less.i haven't been on any forums because my other cars had no issues. What's up with that lol

  14. #194
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    Quote Originally Posted by Muffin
    Interesting you say that because both service mgrs said that the turbo is completely different engine. Geez what's going on!i have test driven about 5 turbos and find not rough at stop lite a little vibration in park but nothing like the 2.5. Two different dealers same answer. What's up with that
    They in fact are different engines- different displacement and aspiration, and probably many other details as well. So the dealers are not wrong. But all 3 engines have the same variable valve timing and direct injection technologies. Almost all car companies have already made the switch to variants to these technologies with their complete lineups. This is not new.

    If I was a dealer, I would change out your OCV and OCV solenoid to see if that fixed your issue. Cheap parts and not a major repair either.

  15. #195
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    Re: Trembling at idle

    Sounds promising. Why since jan they haven't attempted this suggestion ?and TSB out in march now it's July

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