Off idle hesitation
Thread Starter
Racer
Joined: Dec 2003
Posts: 258
Likes: 14
From: Santa Maria Ca.
Off idle hesitation
Hi,
I have a 2017 stingray, base engine with a stick shift. I only have 3k miles on the car, but have noticed it has a off idle hesitation during any light throttle acceleration. It acts like the car is "Cold" and running lean, but it does it all the time even after warm up. In the "Eco mode" it is very rough as it switches from 4 to 8 and I'm wondering if this is normal. I've heard of people with other vehicles ( with automatic transmissions ) that they cannot tell when it switches between 4 and 8 cylinder. Mine is very noticeable. Is this normal?
Thanks,
Mike
I have a 2017 stingray, base engine with a stick shift. I only have 3k miles on the car, but have noticed it has a off idle hesitation during any light throttle acceleration. It acts like the car is "Cold" and running lean, but it does it all the time even after warm up. In the "Eco mode" it is very rough as it switches from 4 to 8 and I'm wondering if this is normal. I've heard of people with other vehicles ( with automatic transmissions ) that they cannot tell when it switches between 4 and 8 cylinder. Mine is very noticeable. Is this normal?
Thanks,
Mike
Melting Slicks
Joined: Nov 2012
Posts: 3,160
Likes: 686
From: SUFFIELD CONNECTICUT
Hi,
I have a 2017 stingray, base engine with a stick shift. I only have 3k miles on the car, but have noticed it has a off idle hesitation during any light throttle acceleration. It acts like the car is "Cold" and running lean, but it does it all the time even after warm up. In the "Eco mode" it is very rough as it switches from 4 to 8 and I'm wondering if this is normal. I've heard of people with other vehicles ( with automatic transmissions ) that they cannot tell when it switches between 4 and 8 cylinder. Mine is very noticeable. Is this normal?
Thanks,
Mike
I have a 2017 stingray, base engine with a stick shift. I only have 3k miles on the car, but have noticed it has a off idle hesitation during any light throttle acceleration. It acts like the car is "Cold" and running lean, but it does it all the time even after warm up. In the "Eco mode" it is very rough as it switches from 4 to 8 and I'm wondering if this is normal. I've heard of people with other vehicles ( with automatic transmissions ) that they cannot tell when it switches between 4 and 8 cylinder. Mine is very noticeable. Is this normal?
Thanks,
Mike
Race Director
Joined: Aug 2015
Posts: 12,179
Likes: 4,681
From: SE WI
Normal. Do a search and you will see. Using a different throttle body can improve it. Luckily when I went to Spring Mountain owner school recently, I remembered to test the Grand Sport I was using there. It did the same exact thing. It's not a problem though. I had to push the accelerator really fast off idle to hear the sound. It sounds like it's sucking air for a short period of time and quickly goes away as it gains RPM.
Burning Brakes
Joined: Jan 2019
Posts: 1,101
Likes: 409
From: Lake Placid, FL
Mine is very rough switching from 4 to 8 mode. I don't use it anymore. I took mine in for the hesitation and rough idle and they told me it needed a PCM update. After they supposedly performed such update I haven't experienced any issues since. Definitely no hesitation if you are in the right gear. If you're too high of a gear then maybe.
Thread Starter
Racer
Joined: Dec 2003
Posts: 258
Likes: 14
From: Santa Maria Ca.
Mine is very rough switching from 4 to 8 mode. I don't use it anymore. I took mine in for the hesitation and rough idle and they told me it needed a PCM update. After they supposedly performed such update I haven't experienced any issues since. Definitely no hesitation if you are in the right gear. If you're too high of a gear then maybe.My hesitation is just as you let out the clutch from a standing start...So do I understand correctly that after you took your car in for a PCM Update the hesitation is gone? Do you remember if it was a "Recall", or any service request number associated with Update? Something I might be able to prompt my dealer into looking at. They only sell 3 Corvettes a year.My hesitation is just as you let out the clutch from a standing start...Than
Last edited by mxw1; Apr 15, 2019 at 10:51 PM.
Thread Starter
Racer
Joined: Dec 2003
Posts: 258
Likes: 14
From: Santa Maria Ca.
Mine is very rough switching from 4 to 8 mode. I don't use it anymore. I took mine in for the hesitation and rough idle and they told me it needed a PCM update. After they supposedly performed such update I haven't experienced any issues since. Definitely no hesitation if you are in the right gear. If you're too high of a gear then maybe.
Do you remember if there was a TSB (Technical Service Bulletin) number associated with the PCM Upgrade?
Thanks,
Mike
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Race Director
Joined: Mar 2001
Posts: 19,898
Likes: 6,697
From: Bonneville Salt Flats
However, they don't all do it. My '18 base, M7 is just fine off idle, light throttle app. When I first read about this shortly after driving my car home from Kerbeck's I went out to see what I had missed for the entire 1600 mile trip home. Nada, zilch, zero.. I'm old enough, have/have had, and driven enough other hi-po cars from Lambos to a gaggle of B'ville race cars, to a Boss 429 to judge. It's not a universal phenomenon with manual C7s... as screwy as that may seem, especially if yours does it. 
(btw, I've never driven mine in econ-mode)
(btw, I've never driven mine in econ-mode)
Last edited by Avanti; Apr 16, 2019 at 12:29 AM.
Burning Brakes
Joined: Jan 2019
Posts: 1,101
Likes: 409
From: Lake Placid, FL
I don't think it's a tsb. I'll look at the paperwork tonight after work and see what they classified it as.
Drifting
Joined: Jan 2005
Posts: 1,827
Likes: 301
From: Tucson Arizona
St. Jude Donor '08
Melting Slicks
Joined: Nov 2007
Posts: 2,775
Likes: 925
From: Indianapolis IN
My 2019 Z M7 is awful. I hate the off idle hesitation/lag/stumble, however you want to categorize it. First time I drove the car I stalled it 3 times! Havent stalled a manual in I dont know how long!! I felt like a dork. (Maybe I am dork, who knows....)
Thread Starter
Racer
Joined: Dec 2003
Posts: 258
Likes: 14
From: Santa Maria Ca.
My car has the off idle hesitation or stumble in all modes, not just eco mode.
I also stated that ;While in the eco mode is it very noticeable when it switches between 4 and 8 cylinder modes, it feels like the ignition is cycled off and on again for about 1/2 second.
Just in case these two problem were related...
Thanks,
Mike
I also stated that ;While in the eco mode is it very noticeable when it switches between 4 and 8 cylinder modes, it feels like the ignition is cycled off and on again for about 1/2 second.
Just in case these two problem were related...
Thanks,
Mike
Supporting Vendor
Joined: Dec 2018
Posts: 1,683
Likes: 808
From: South Alabama
My car has the off idle hesitation or stumble in all modes, not just eco mode.
I also stated that ;While in the eco mode is it very noticeable when it switches between 4 and 8 cylinder modes, it feels like the ignition is cycled off and on again for about 1/2 second.
Just in case these two problem were related...
Thanks,
Mike
I also stated that ;While in the eco mode is it very noticeable when it switches between 4 and 8 cylinder modes, it feels like the ignition is cycled off and on again for about 1/2 second.
Just in case these two problem were related...
Thanks,
Mike
https://www.corvetteforum.com/forums...post1598646214
Thanks,
__________________
Soler Performance LLC
support@solerengineering.com
www.solerengineering.com
(251) 468-9786
Soler Performance LLC
support@solerengineering.com
www.solerengineering.com
(251) 468-9786
Last edited by Mike@SolerEngr; Apr 25, 2019 at 12:14 PM.
Racer
Joined: Apr 2018
Posts: 251
Likes: 83
From: So Cal
Have you tried driving in sport mode? That is supposed to improve throttle response whether you have mag ride or not. Electronic throttle takes some getting used to as well. From what I know about Eco mode the benefits are not worth the aggravation. Some even say it's just not very good for the car. I never have driven my car, a 2019 stingray with stick shift, and mag ride, in Eco mode. I get really good mileage on road trips, provided I somehow manage to keep my foot out of it. Most people are shocked to hear I can get 28 miles per gallon on the highway. Throttle body will make a difference but will probably void the warranty, though I'm not certain about that. And if you hear that air sucking sound you're probably using more throttle than appropriate for your rpm's at the time.
Safety Car
Joined: May 2003
Posts: 3,520
Likes: 819
From: Brighton Mi
Get the soler engineering throttle body. It's designed to fix the truck like off idle tip in hesitation.
I'm not affiliated but I do own one
I'm not affiliated but I do own one
Last edited by spinkick; Apr 27, 2019 at 01:19 AM.