Why does it sound camed?

RobertAvitia · 08-01-2017, 10:36 AM

It was a little cool this morning so I drove home without my ac on and the cars idle didn't seem right. At take off, it was a little jumpy but once I got home, I let it idle and it would consistently bog down just a little but it was noticeable with the ac off. If I turned the ac on, the idle would correctly its self and be smooth (like normal)... any ideas?

zryan · 08-01-2017, 10:42 AM

When you turn the AC on the RPM must jump a tad to power the AC. That is likely why it smoothed out your car is operating normally at higher RPMS. Other than that Im not sure what could be causes the issue besides throttle body not returning valves to their correct position. Someone else will have more depth on the subject than me.

RobertAvitia · 08-01-2017, 11:33 AM

Quote:

Originally Posted by cooper1965

How low are the RPM's in Drive with just the brake pressed? Assume no lights?

It was right in between 500&1k so I'd say 800ish. And no lights came up

Gutling · 08-01-2017, 11:39 AM

Mine did have an issue where it would idle low, like vibrate car low when coming up to stops/slowing down. It actually stalled out one day at a stop light one day and threw a low pressure code. The dealer updated TCM and it corrected it, has not dropped to low idle since. Maybe worth checking on.

RobertAvitia · 08-01-2017, 11:55 AM

Quote:

Originally Posted by Gutling

Mine did have an issue where it would idle low, like vibrate car low when coming up to stops/slowing down. It actually stalled out one day at a stop light one day and threw a low pressure code. The dealer updated TCM and it corrected it, has not dropped to low idle since. Maybe worth checking on.

That definitely sound like what I'm dealing with. Thanks!

Michigan1LTRS · 08-01-2017, 12:39 PM

Well, you have dual overhead cams, so.

RobertAvitia · 08-01-2017, 03:07 PM

Quote:

Originally Posted by cooper1965

Don't know how many miles you got but, could be the start of carbon build up on the intake and/or exhaust valves due to fuel contamination or incomplete burning of the fuel. Usually have DTC's set though..

Only at around 6,500

ChicagoTommy · 08-01-2017, 06:48 PM

Take a video!

RobertAvitia · 08-01-2017, 08:11 PM

Quote:

Originally Posted by cooper1965

GM say's their direct injected engines could start having build-up as early as 5,000 miles. Not saying that's for sure what you are feeling though, as I have seen bad engine mounts "feel" like a miss or rough at idle. Hard to say, at least your under warranty!

Alright Ima take the car in tomorrow

Michigan1LTRS · 08-01-2017, 08:20 PM

On a side note Robert, I noticed you said you turned the AC off cause it was chilly out. You have climate control. Set the temp where you like it and forget it. Your Car will maintain that temp and you don't have to do anything.

Dub9 · 08-01-2017, 08:37 PM

Quote:

Originally Posted by cooper1965

^^ PRO tip !!

Doesn't the compressor still drag?

I wish I could use Auto without AC. Works on my Mini, and isn't super useful with a convertible.

RobertAvitia · 08-01-2017, 08:40 PM

Quote:

Originally Posted by Michigan1LTRS

On a side note Robert, I noticed you said you turned the AC off cause it was chilly out. You have climate control. Set the temp where you like it and forget it. Your Car will maintain that temp and you don't have to do anything.

I do but I had the windows down. I'm not ganna have the ac on with the windows down

Michigan1LTRS · 08-01-2017, 08:54 PM

Quote:

Originally Posted by RobertAvitia

I do but I had the windows down. I'm not ganna have the ac on with the windows down

Ah, ok, gotcha.

RobertAvitia · 08-07-2017, 05:23 PM

Would a drop of 10rpms be noticeable?? I hooked up a live data reader to my obd2 and the Rpms are dropping from 759 to 745 consistently

08-01-2017, 10:36 AM	#1
RobertAvitia BYND GARAGE Drives: 17' 1LT Turbo Join Date: Feb 2016 Location: CA Posts: 667	Why does it sound camed? It was a little cool this morning so I drove home without my ac on and the cars idle didn't seem right. At take off, it was a little jumpy but once I got home, I let it idle and it would consistently bog down just a little but it was noticeable with the ac off. If I turned the ac on, the idle would correctly its self and be smooth (like normal)... any ideas? __________________ https://m.youtube.com/#/c/BEYONDGARAGE http://instagram.com/bynd_ltg

08-01-2017, 10:42 AM	#2
zryan Drives: 1973 z28 Rs, 2018 SS 1LE Join Date: Jun 2017 Location: Greater Philadelphia Area Posts: 323	When you turn the AC on the RPM must jump a tad to power the AC. That is likely why it smoothed out your car is operating normally at higher RPMS. Other than that Im not sure what could be causes the issue besides throttle body not returning valves to their correct position. Someone else will have more depth on the subject than me. __________________ 2018 HBM SS 1LE Built 7/26: Black emblems, Smoked reflectors/lights, Dimple magnetic drain plugs, Carbon rock guards, Carbon fuel door, Elite Engineering Catch-can, BMR strut-brace,

08-01-2017, 12:39 PM	#6
Michigan1LTRS Blessed ❤️ Drives: 2017 1LT RS I4 Join Date: Sep 2016 Location: Indiana Posts: 2,577	Well, you have dual overhead cams, so. __________________ 2017 1LT RS I4 A8 BLACK ON BLACK Kindness and compassion #OthersFirst

08-01-2017, 08:20 PM	#10
Michigan1LTRS Blessed ❤️ Drives: 2017 1LT RS I4 Join Date: Sep 2016 Location: Indiana Posts: 2,577	On a side note Robert, I noticed you said you turned the AC off cause it was chilly out. You have climate control. Set the temp where you like it and forget it. Your Car will maintain that temp and you don't have to do anything. __________________ 2017 1LT RS I4 A8 BLACK ON BLACK Kindness and compassion #OthersFirst

08-07-2017, 05:23 PM	#14
RobertAvitia BYND GARAGE Drives: 17' 1LT Turbo Join Date: Feb 2016 Location: CA Posts: 667	Would a drop of 10rpms be noticeable?? I hooked up a live data reader to my obd2 and the Rpms are dropping from 759 to 745 consistently __________________ https://m.youtube.com/#/c/BEYONDGARAGE http://instagram.com/bynd_ltg

08-01-2017, 11:39 AM	#4
Gutling Drives: 2017 Chevrolet Camaro 2.0 LT Join Date: Apr 2017 Location: Dillsboro, NC Posts: 202	Mine did have an issue where it would idle low, like vibrate car low when coming up to stops/slowing down. It actually stalled out one day at a stop light one day and threw a low pressure code. The dealer updated TCM and it corrected it, has not dropped to low idle since. Maybe worth checking on.

08-01-2017, 06:48 PM	#8
ChicagoTommy Drives: 2017 Camaro; 2017 Acadia Denali Join Date: Jun 2016 Location: Chicago, IL/Williams Bay WI Posts: 1,022	Take a video!

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