Hesitation issues
07-30-2015, 12:33 AM
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Hesitation issues
Guys i have a 2015 corvette C7 stingray and i purchased in Michigan 5 months ago. I have about 9k miles and i realized that when I floor my car, the power does not kick in right away (there is a hesitation before it kicks in). it looks like it waits about a second and kicks in.. especially when I start from 0 mph. The car is in the dealership and told me that they test drove the car to see what sup.
but they told me that they have the documents saying that some corvettes are hesitating for micro -seconds. they told me it is normal and i definitely think it is abnormal. i am going to the dealership on friday and i really want suggestions. I really dont want this car if it can't even function right to have the full speed and the power.
My 2014 stingray never did this.
what should i do ? i feel like i want to file complaints to GM.
help me out here
but they told me that they have the documents saying that some corvettes are hesitating for micro -seconds. they told me it is normal and i definitely think it is abnormal. i am going to the dealership on friday and i really want suggestions. I really dont want this car if it can't even function right to have the full speed and the power.
My 2014 stingray never did this.
what should i do ? i feel like i want to file complaints to GM.
help me out here
07-30-2015, 12:48 AM
#2
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Guys i have a 2015 corvette C7 stingray and i purchased in Michigan 5 months ago. I have about 9k miles and i realized that when I floor my car, the power does not kick in right away (there is a hesitation before it kicks in). it looks like it waits about a second and kicks in.. especially when I start from 0 mph. The car is in the dealership and told me that they test drove the car to see what sup.
but they told me that they have the documents saying that some corvettes are hesitating for micro -seconds. they told me it is normal and i definitely think it is abnormal. i am going to the dealership on friday and i really want suggestions. I really dont want this car if it can't even function right to have the full speed and the power.
My 2014 stingray never did this.
what should i do ? i feel like i want to file complaints to GM.
help me out here
but they told me that they have the documents saying that some corvettes are hesitating for micro -seconds. they told me it is normal and i definitely think it is abnormal. i am going to the dealership on friday and i really want suggestions. I really dont want this car if it can't even function right to have the full speed and the power.
My 2014 stingray never did this.
what should i do ? i feel like i want to file complaints to GM.
help me out here
Last edited by FYREANT; 07-30-2015 at 01:09 AM.
07-30-2015, 01:08 AM
#3
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ya
From my common sense knowledge, this should not happen to any vehicle right? especially for corvettes. if you are paying for fast cars why should there be hesitations?
07-30-2015, 01:08 PM
#6
Safety Car
Can you describe the hesitation in more detail?
For example, if you mash the throttle, or give it about 1/2 throttle, and literally nothing happens for a second or more, that's not normal.
But if you mean that you give it a bunch of throttle from, say 2000 rpm, and it starts moving, but doesn't really get moving until the revs get up around 3500, or you mash the throttle to the floor, that is normal.
The 'vette implements something called torque management which limits acceleration under some conditions in the name of driver safety. One example: the throttle is very non-linear. The first 50% of gas pedal motion is significantly less than 50% of throttle opening. Another example: the computer won't let the throttle open 100% below about 3500 rpm, even if you mash the pedal to the floor.
You probably wouldn't want to completely eliminate torque management on the street, but from what I read here a good tune, or a device like the Diablosport tuners, can make the car much more responsive.
Based on your description, I think you might be seeing the effects of torque management, but it's hard to be sure.
For example, if you mash the throttle, or give it about 1/2 throttle, and literally nothing happens for a second or more, that's not normal.
But if you mean that you give it a bunch of throttle from, say 2000 rpm, and it starts moving, but doesn't really get moving until the revs get up around 3500, or you mash the throttle to the floor, that is normal.
The 'vette implements something called torque management which limits acceleration under some conditions in the name of driver safety. One example: the throttle is very non-linear. The first 50% of gas pedal motion is significantly less than 50% of throttle opening. Another example: the computer won't let the throttle open 100% below about 3500 rpm, even if you mash the pedal to the floor.
You probably wouldn't want to completely eliminate torque management on the street, but from what I read here a good tune, or a device like the Diablosport tuners, can make the car much more responsive.
Based on your description, I think you might be seeing the effects of torque management, but it's hard to be sure.
07-30-2015, 01:29 PM
#7
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Can you describe the hesitation in more detail?
For example, if you mash the throttle, or give it about 1/2 throttle, and literally nothing happens for a second or more, that's not normal.
But if you mean that you give it a bunch of throttle from, say 2000 rpm, and it starts moving, but doesn't really get moving until the revs get up around 3500, or you mash the throttle to the floor, that is normal.
The 'vette implements something called torque management which limits acceleration under some conditions in the name of driver safety. One example: the throttle is very non-linear. The first 50% of gas pedal motion is significantly less than 50% of throttle opening. Another example: the computer won't let the throttle open 100% below about 3500 rpm, even if you mash the pedal to the floor.
You probably wouldn't want to completely eliminate torque management on the street, but from what I read here a good tune, or a device like the Diablosport tuners, can make the car much more responsive.
Based on your description, I think you might be seeing the effects of torque management, but it's hard to be sure.
For example, if you mash the throttle, or give it about 1/2 throttle, and literally nothing happens for a second or more, that's not normal.
But if you mean that you give it a bunch of throttle from, say 2000 rpm, and it starts moving, but doesn't really get moving until the revs get up around 3500, or you mash the throttle to the floor, that is normal.
The 'vette implements something called torque management which limits acceleration under some conditions in the name of driver safety. One example: the throttle is very non-linear. The first 50% of gas pedal motion is significantly less than 50% of throttle opening. Another example: the computer won't let the throttle open 100% below about 3500 rpm, even if you mash the pedal to the floor.
You probably wouldn't want to completely eliminate torque management on the street, but from what I read here a good tune, or a device like the Diablosport tuners, can make the car much more responsive.
Based on your description, I think you might be seeing the effects of torque management, but it's hard to be sure.
thats why I recommended he test drive another to confirm if that was the issue or not.
07-30-2015, 02:01 PM
#8
I am willing to bet its normal because mine doesnt response 100% unless i am really on the gas.
Its like you give it some gas, and it makes a quick one second calculation then power is given. lol!
Its like you give it some gas, and it makes a quick one second calculation then power is given. lol!
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07-31-2015, 12:01 AM
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When I step on the acceleration pedal to the floor from the stop, it would not kick in right away. looks like it is thinking and kicks in.
Looks like car moves after 0.5-1 second after i hit on the acceleration pedal.
it also does same thing when car is moving when i hit on the gas pedal.
i am planning to go pick up my car from the dealership and drive with them tomorrow. I am going to demonstrate the problems when i am with them in the car.
I just think this is an unnecessary problem. It is not a cheap car and they should not have any of these problems when they make the car.
Also if they tune my car will it get rid of the factory warranty?
thanks
Looks like car moves after 0.5-1 second after i hit on the acceleration pedal.
it also does same thing when car is moving when i hit on the gas pedal.
i am planning to go pick up my car from the dealership and drive with them tomorrow. I am going to demonstrate the problems when i am with them in the car.
I just think this is an unnecessary problem. It is not a cheap car and they should not have any of these problems when they make the car.
Also if they tune my car will it get rid of the factory warranty?
thanks
Can you describe the hesitation in more detail?
For example, if you mash the throttle, or give it about 1/2 throttle, and literally nothing happens for a second or more, that's not normal.
But if you mean that you give it a bunch of throttle from, say 2000 rpm, and it starts moving, but doesn't really get moving until the revs get up around 3500, or you mash the throttle to the floor, that is normal.
The 'vette implements something called torque management which limits acceleration under some conditions in the name of driver safety. One example: the throttle is very non-linear. The first 50% of gas pedal motion is significantly less than 50% of throttle opening. Another example: the computer won't let the throttle open 100% below about 3500 rpm, even if you mash the pedal to the floor.
You probably wouldn't want to completely eliminate torque management on the street, but from what I read here a good tune, or a device like the Diablosport tuners, can make the car much more responsive.
Based on your description, I think you might be seeing the effects of torque management, but it's hard to be sure.
For example, if you mash the throttle, or give it about 1/2 throttle, and literally nothing happens for a second or more, that's not normal.
But if you mean that you give it a bunch of throttle from, say 2000 rpm, and it starts moving, but doesn't really get moving until the revs get up around 3500, or you mash the throttle to the floor, that is normal.
The 'vette implements something called torque management which limits acceleration under some conditions in the name of driver safety. One example: the throttle is very non-linear. The first 50% of gas pedal motion is significantly less than 50% of throttle opening. Another example: the computer won't let the throttle open 100% below about 3500 rpm, even if you mash the pedal to the floor.
You probably wouldn't want to completely eliminate torque management on the street, but from what I read here a good tune, or a device like the Diablosport tuners, can make the car much more responsive.
Based on your description, I think you might be seeing the effects of torque management, but it's hard to be sure.
07-31-2015, 12:36 AM
#11
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St. Jude Donor '13-'14-'15
The hesitation can be a couple things----
From a dead stop and the Traction control ON --sure you will get a hesitation as the TC system is preventing the tires from spinning----With the TC OFF you should be able to spin the tires and most of the delay/hesitation will go away
HOWEVER there is another programming issue on a C7 that causes a hesitation whether the TC is on or off--
The C7 drive by wire throttle proramming does NOT allow the throttle to go to wide open until the RPM's exceed approx. 3400-3600 RPM's--So even if you floor the throttle there is a built in throttle opening limit until you reach that RPM---That in turns causes another sort of delay/hesitation
Good news is that this table in your ECM is completely tunable---You can tune the throttle to go to wide open from idle on up----and not the factory programmed 3400-3600
From a dead stop and the Traction control ON --sure you will get a hesitation as the TC system is preventing the tires from spinning----With the TC OFF you should be able to spin the tires and most of the delay/hesitation will go away
HOWEVER there is another programming issue on a C7 that causes a hesitation whether the TC is on or off--
The C7 drive by wire throttle proramming does NOT allow the throttle to go to wide open until the RPM's exceed approx. 3400-3600 RPM's--So even if you floor the throttle there is a built in throttle opening limit until you reach that RPM---That in turns causes another sort of delay/hesitation
Good news is that this table in your ECM is completely tunable---You can tune the throttle to go to wide open from idle on up----and not the factory programmed 3400-3600
07-31-2015, 09:22 AM
#12
Safety Car
The hesitation you describe doesn't sound normal to me.
It won't eliminate the warranty entirely, but will allow GM to void coverage for anything related to the tune.
So if your radiator fails, say, or the paint blisters, those would still be covered by warranty because the tune doesn't affect the radiator or the paint. But if you have an engine failure, GM could claim it was because of the tune and refuse to honor the warranty on the engine.
Diablosport claims that if you use their product, you can reverse the tune and go back to factory and GM can't tell you did anything. Some people believe that GM will be able to tell. I don't have a tune, and I have no idea who is correct.
So if your radiator fails, say, or the paint blisters, those would still be covered by warranty because the tune doesn't affect the radiator or the paint. But if you have an engine failure, GM could claim it was because of the tune and refuse to honor the warranty on the engine.
Diablosport claims that if you use their product, you can reverse the tune and go back to factory and GM can't tell you did anything. Some people believe that GM will be able to tell. I don't have a tune, and I have no idea who is correct.
07-31-2015, 10:52 AM
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The hesitation you describe doesn't sound normal to me.
It won't eliminate the warranty entirely, but will allow GM to void coverage for anything related to the tune.
So if your radiator fails, say, or the paint blisters, those would still be covered by warranty because the tune doesn't affect the radiator or the paint. But if you have an engine failure, GM could claim it was because of the tune and refuse to honor the warranty on the engine.
Diablosport claims that if you use their product, you can reverse the tune and go back to factory and GM can't tell you did anything. Some people believe that GM will be able to tell. I don't have a tune, and I have no idea who is correct.
It won't eliminate the warranty entirely, but will allow GM to void coverage for anything related to the tune.
So if your radiator fails, say, or the paint blisters, those would still be covered by warranty because the tune doesn't affect the radiator or the paint. But if you have an engine failure, GM could claim it was because of the tune and refuse to honor the warranty on the engine.
Diablosport claims that if you use their product, you can reverse the tune and go back to factory and GM can't tell you did anything. Some people believe that GM will be able to tell. I don't have a tune, and I have no idea who is correct.
07-31-2015, 09:56 PM
#14
Burning Brakes
My 14 does it, It seems to me it has gotten worse over the years as they add more gears. I can quickly floor it and let off and nothing happens because of this delay in these systems. That is throttle by wire!
07-31-2015, 11:02 PM
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St. Jude Donor '13-'14-'15
Prior to 2014 most all tunes whether a handheld tuner or a full tune with HP or EFILIVE was completely un detectable
However with the advent of GM's new E92 ECM that's used on the 2014 Silverado na Corvette the tune can be detected---Not the tune file itself but rather by a more complicated issue---When a 2014-2015 Silverado or Corvette is tuned the "CHECKSUMS" can be changed--- Checksums are a very hard thing to describe-
As far as my experience has been so far no dealers in my area have refused to honor a warranty issue on the engine if the checksums don't match the factory numbers---I think with a history of abuse they may play that card but on most cars they overlook it---
JMHO
However with the advent of GM's new E92 ECM that's used on the 2014 Silverado na Corvette the tune can be detected---Not the tune file itself but rather by a more complicated issue---When a 2014-2015 Silverado or Corvette is tuned the "CHECKSUMS" can be changed--- Checksums are a very hard thing to describe-
As far as my experience has been so far no dealers in my area have refused to honor a warranty issue on the engine if the checksums don't match the factory numbers---I think with a history of abuse they may play that card but on most cars they overlook it---
JMHO
07-31-2015, 11:35 PM
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Prior to 2014 most all tunes whether a handheld tuner or a full tune with HP or EFILIVE was completely un detectable
However with the advent of GM's new E92 ECM that's used on the 2014 Silverado na Corvette the tune can be detected---Not the tune file itself but rather by a more complicated issue---When a 2014-2015 Silverado or Corvette is tuned the "CHECKSUMS" can be changed--- Checksums are a very hard thing to describe-
As far as my experience has been so far no dealers in my area have refused to honor a warranty issue on the engine if the checksums don't match the factory numbers---I think with a history of abuse they may play that card but on most cars they overlook it---
JMHO
However with the advent of GM's new E92 ECM that's used on the 2014 Silverado na Corvette the tune can be detected---Not the tune file itself but rather by a more complicated issue---When a 2014-2015 Silverado or Corvette is tuned the "CHECKSUMS" can be changed--- Checksums are a very hard thing to describe-
As far as my experience has been so far no dealers in my area have refused to honor a warranty issue on the engine if the checksums don't match the factory numbers---I think with a history of abuse they may play that card but on most cars they overlook it---
JMHO
2009
2009
Specific
2008
2007
2004
Hell, there's an infinite amount of examples.
Last edited by Higgs Boson; 07-31-2015 at 11:38 PM.
08-01-2015, 06:16 PM
#17
Safety Car
I read that thread, and nothing in it "proved" anything as far as I'm concerned. If the poster knew for a fact that GM had looked for ECM changes and found none, that would be proof.
08-01-2015, 07:11 PM
#18
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Or it confirmed that GM saw the cause of the problem was defective parts and never even looked to see if it had been tuned.
I read that thread, and nothing in it "proved" anything as far as I'm concerned. If the poster knew for a fact that GM had looked for ECM changes and found none, that would be proof.
I read that thread, and nothing in it "proved" anything as far as I'm concerned. If the poster knew for a fact that GM had looked for ECM changes and found none, that would be proof.
08-02-2015, 12:06 PM
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[QUOTE=meyerweb;1590179748]Or it confirmed that GM saw the cause of the problem was defective parts and never even looked to see if it had been tuned.
I read that thread, and nothing in it "proved" anything as far as I'm concerned. If the poster knew for a fact that GM had looked for ECM changes and found none, that would be proof.[/QUOT
gm really needs to pay attention and apologize. wasting my time
I read that thread, and nothing in it "proved" anything as far as I'm concerned. If the poster knew for a fact that GM had looked for ECM changes and found none, that would be proof.[/QUOT
gm really needs to pay attention and apologize. wasting my time