Engine stutter
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 847
Likes: 9
From: Beaumont Tx
Engine stutter
a6,
my engine stutters for what seems an eternity when I'm cruising 20-30 or whatever adn stomp throttle. even my wife who was driving viper with top down commented that it didn't sound right. Is this common, or just specific to my vehicle?
Has any bought and used successfully the diablosport tuner?? I talked to one of forums vendors adn he stated that I could change shift points, make tranny work better ie: stutter and when I put long tube headers, either cats or no cats, & b&b bullets that this handheld tuner could handle the job. however, I have a friend that's into this stuff claim that no hand held tuner will make me happy...
sorry for making this thread multi parts, but I've had alot of irons in the fire, trying to buy house & sell current one.....uuggh..
as always thanks for your input, good and bad
my engine stutters for what seems an eternity when I'm cruising 20-30 or whatever adn stomp throttle. even my wife who was driving viper with top down commented that it didn't sound right. Is this common, or just specific to my vehicle?
Has any bought and used successfully the diablosport tuner?? I talked to one of forums vendors adn he stated that I could change shift points, make tranny work better ie: stutter and when I put long tube headers, either cats or no cats, & b&b bullets that this handheld tuner could handle the job. however, I have a friend that's into this stuff claim that no hand held tuner will make me happy...
sorry for making this thread multi parts, but I've had alot of irons in the fire, trying to buy house & sell current one.....uuggh..
as always thanks for your input, good and bad
Melting Slicks
Joined: May 2007
Posts: 3,269
Likes: 25
From: Simi Valley Ca
From your description, that does not sound right. Are you running the stock tune? If not, I'd reinstall the stock tune and see if that resolves it.
As for using a handheld tuner for things like headers and exhaust, you can use the tuner but you will likely need a custom tune as the "canned" included with the diablo tuners are for essentially a stock car running a more restrictive stock exhaust. Once you start monkeying with long tubes and removing cats, you are going to run into issues that the canned tune will not address and cat removal on a canned tune will likely result in a CEL. There are 3rd party partners to diablo that offer custom tunes for use with the hand held tuners, that would be your best bet assuming you can't get the car properly tuned on a dyno.
As for using a handheld tuner for things like headers and exhaust, you can use the tuner but you will likely need a custom tune as the "canned" included with the diablo tuners are for essentially a stock car running a more restrictive stock exhaust. Once you start monkeying with long tubes and removing cats, you are going to run into issues that the canned tune will not address and cat removal on a canned tune will likely result in a CEL. There are 3rd party partners to diablo that offer custom tunes for use with the hand held tuners, that would be your best bet assuming you can't get the car properly tuned on a dyno.
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
That sounds like TM is kicking in and just retarding the timing or something. Is this on the stock tune as he asked above?
Serious problem if so - if not, just a tune issue.
Serious problem if so - if not, just a tune issue.
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 847
Likes: 9
From: Beaumont Tx
I have done nothing to car. this is totally stock with NPP.
the first time it happened, i thought it was the tires spinning and that is was the TC kicking in. now when it does it I look at dash and nothing lights up ie: TC does not come on.
the first time it happened, i thought it was the tires spinning and that is was the TC kicking in. now when it does it I look at dash and nothing lights up ie: TC does not come on.
Le Mans Master
Joined: Sep 1999
Posts: 7,810
Likes: 416
From: FL
Traction control kicks in on the C7 and the car falters for a second or two.
Needless to say if it's raining or in snow you would want to leave the TC on. No snow in Fl......yet.
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
I had that issue in my A6(when flooring the gas pedal as when the old cars went into what my Dad called "passing gear") but I now drive with the TC off and there never any stutter when flooring the gas pedal.
Traction control kicks in on the C7 and the car falters for a second or two.
Needless to say if it's raining or in snow you would want to leave the TC on. No snow in Fl......yet.
Traction control kicks in on the C7 and the car falters for a second or two.
Needless to say if it's raining or in snow you would want to leave the TC on. No snow in Fl......yet.
It sounds like TM is pulling him back before he even has a chance to spin them.
Prodago, does this happen in all modes? How about with T/C turned off?
Le Mans Master
Joined: Sep 1999
Posts: 7,810
Likes: 416
From: FL
Doesn't the T/C indicator light up when that happens, though?
Mine did not light up, perhaps due to TM becoming active prior to wheelspin and actual engagement of TC?
It sounds like TM is pulling him back before he even has a chance to spin them.
I think so.
Prodago, does this happen in all modes? How about with T/C turned off?
Mine did not light up, perhaps due to TM becoming active prior to wheelspin and actual engagement of TC?
It sounds like TM is pulling him back before he even has a chance to spin them.
I think so.
Prodago, does this happen in all modes? How about with T/C turned off?
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Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 847
Likes: 9
From: Beaumont Tx
that's what I thought, so i've started watching and my tires aren't spinning. when I floor it and car starts to downshift (and it does just stammers or pauses. actually now that I'm thinking it makes a pop..pop..sound very quickly) and it stammers, so I instantly look to see if tires broke loose adn I get zero indication of TC kicking in, or the other symbol of posi-track leaving skid marks symbol.
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 847
Likes: 9
From: Beaumont Tx
theta, I will do more recon this evening.
what does TCM mean??
thanks to all,
John
Melting Slicks
Joined: May 2007
Posts: 3,269
Likes: 25
From: Simi Valley Ca
I have only been doing this in sport and track modes. I leave it in sport most all the time. to be honest I can't tell the difference in any of the most!!! I'm no pro track racer, but my C6 with hi flowing exhaust would beat my c7....at least as far as take off, or if I floored it. Thats what I love to do, be cruising at whatever speed and floor it and snap your head against the rest. and this c7 is not reacting like I think it should.
theta, I will do more recon this evening.
what does TCM mean??
thanks to all,
John
theta, I will do more recon this evening.
what does TCM mean??
thanks to all,
John
TCM means Traction Control Management. The cars computer intervenes when it senses a loss of traction and will essentially shut the engine down as needed so that traction isn't lost. When you get on the gas hard, TCM will kick in to make sure the wheels don't spin.
Safety Car
Joined: Feb 2013
Posts: 4,875
Likes: 1,174
I have only been doing this in sport and track modes. I leave it in sport most all the time. to be honest I can't tell the difference in any of the most!!! I'm no pro track racer, but my C6 with hi flowing exhaust would beat my c7....at least as far as take off, or if I floored it. Thats what I love to do, be cruising at whatever speed and floor it and snap your head against the rest. and this c7 is not reacting like I think it should.
theta, I will do more recon this evening.
what does TCM mean??
thanks to all,
John
theta, I will do more recon this evening.
what does TCM mean??
thanks to all,
John
Racer
Joined: Nov 2013
Posts: 313
Likes: 44
From: Little Rock AR
This is exactly what mine is doing & it's even more exaggerated when trying to use launch control. The engine will go almost completely silent for a split second no ignition or anything. I need to log some data & see what the hell is going on. Most folks tell me it's wheel spin but I know wheel spin & how the systems mitigate it this is different, it's missing except I have no afterfire or pop probably because of the system making adjustments.
Vin#8693 produced 11/14
2014 c7 a6 MRC NNP Z51
Wormwood
Oh another obvious point is whenever you stomp the throttle it loses power almost proportional to the speed at which you press the throttle the biggest lose of power being launch control. To confirm this I can from a rolling start hit the throttle with TC/stabilitrack off & only after it hiccups do I start to spin. Where as if I give a controlled progressive throttle advance to the floor there no pause in power & quickly start to spin.
Vin#8693 produced 11/14
2014 c7 a6 MRC NNP Z51
Wormwood
Oh another obvious point is whenever you stomp the throttle it loses power almost proportional to the speed at which you press the throttle the biggest lose of power being launch control. To confirm this I can from a rolling start hit the throttle with TC/stabilitrack off & only after it hiccups do I start to spin. Where as if I give a controlled progressive throttle advance to the floor there no pause in power & quickly start to spin.
Last edited by Wormwood; Apr 10, 2014 at 10:39 AM.
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 847
Likes: 9
From: Beaumont Tx
I tried it with TC off and it seemed to launch better, and by launch I mean going 45-75 approx and nail it. however, sometimes when floored it doesn't seem to drop to the lowest possible(safe) gear and shoot off like rocket, as my C6 did.
but I don't want to run with tc off all the time, what happens when I lose control? Like i said before I'm not a drag racer, nor am I one to get sucked in by the pesky mustangs for a highway race. but I do love to floor it whenever.......
Sorry if that wasn't much data well -usefull data.
thanks for ya'lls input.
Wormwood, keep us posted. curious to see what happens. I can understand that when doing launch control,you're gonna have to have some hot/sticky tires to not spin. every time I've tried it my tires have broke loose. and if you have TC on then yes your engine will stumble as your engine keeps you from smashing into whatever. laymans terms from what these other guys are saying with the TCM and all.
also, check out the thread about dying your stitching. its pretty cool.
but I don't want to run with tc off all the time, what happens when I lose control? Like i said before I'm not a drag racer, nor am I one to get sucked in by the pesky mustangs for a highway race. but I do love to floor it whenever.......
Sorry if that wasn't much data well -usefull data.
thanks for ya'lls input.
Wormwood, keep us posted. curious to see what happens. I can understand that when doing launch control,you're gonna have to have some hot/sticky tires to not spin. every time I've tried it my tires have broke loose. and if you have TC on then yes your engine will stumble as your engine keeps you from smashing into whatever. laymans terms from what these other guys are saying with the TCM and all.
also, check out the thread about dying your stitching. its pretty cool.
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
I feel like there might have been an anti-abuse mapping added in that was way too strict on the TM. It's happened in the past with GTO A4s, etc.
Service should be able to replicate it, and you can ask a technician to quickly take a ridealong with you to show him.
That's your best bet. Even with TC on, you guys shouldn't be seeing such bad drops.
Service should be able to replicate it, and you can ask a technician to quickly take a ridealong with you to show him.
That's your best bet. Even with TC on, you guys shouldn't be seeing such bad drops.
Racer
Joined: Nov 2013
Posts: 313
Likes: 44
From: Little Rock AR
I tried it with TC off and it seemed to launch better, and by launch I mean going 45-75 approx and nail it. however, sometimes when floored it doesn't seem to drop to the lowest possible(safe) gear and shoot off like rocket, as my C6 did.
but I don't want to run with tc off all the time, what happens when I lose control? Like i said before I'm not a drag racer, nor am I one to get sucked in by the pesky mustangs for a highway race. but I do love to floor it whenever.......
Sorry if that wasn't much data well -usefull data.
thanks for ya'lls input.
Wormwood, keep us posted. curious to see what happens. I can understand that when doing launch control,you're gonna have to have some hot/sticky tires to not spin. every time I've tried it my tires have broke loose. and if you have TC on then yes your engine will stumble as your engine keeps you from smashing into whatever. laymans terms from what these other guys are saying with the TCM and all.
also, check out the thread about dying your stitching. its pretty cool.
but I don't want to run with tc off all the time, what happens when I lose control? Like i said before I'm not a drag racer, nor am I one to get sucked in by the pesky mustangs for a highway race. but I do love to floor it whenever.......
Sorry if that wasn't much data well -usefull data.
thanks for ya'lls input.
Wormwood, keep us posted. curious to see what happens. I can understand that when doing launch control,you're gonna have to have some hot/sticky tires to not spin. every time I've tried it my tires have broke loose. and if you have TC on then yes your engine will stumble as your engine keeps you from smashing into whatever. laymans terms from what these other guys are saying with the TCM and all.
also, check out the thread about dying your stitching. its pretty cool.
Wormwood,
I finally got around to setting up the V2 for logging this weekend. I haven't altered my ECM, I've read my stock file but that it, & don't want to change any calibrations until there's a better understanding of the e92 & the LT1.
I should be able to post a data log with a short video of my c7 hesitating this week.
Wormwood