Diesel Cayenne and VW emission issue
#5491
I've experienced this too - mostly when in heavy traffic and needing to LEAP into another lane.
I can't say it's a "post fix" thing. I've experienced this problem across my last few cars - IMO it's a transmission calibration thing. My old Audi A6 (6sp auto) and GMC Sierra (also a 6sp auto) seemed to want to get to the higher gear ASAP and as such, I'd catch it with it's pants down sometimes when I'd nail the throttle and the trans would have to *decide* what gear it wanted to be in.
I can't say it's a "post fix" thing. I've experienced this problem across my last few cars - IMO it's a transmission calibration thing. My old Audi A6 (6sp auto) and GMC Sierra (also a 6sp auto) seemed to want to get to the higher gear ASAP and as such, I'd catch it with it's pants down sometimes when I'd nail the throttle and the trans would have to *decide* what gear it wanted to be in.
#5492
Burning Brakes
I've experienced this too - mostly when in heavy traffic and needing to LEAP into another lane.
I can't say it's a "post fix" thing. I've experienced this problem across my last few cars - IMO it's a transmission calibration thing. My old Audi A6 (6sp auto) and GMC Sierra (also a 6sp auto) seemed to want to get to the higher gear ASAP and as such, I'd catch it with it's pants down sometimes when I'd nail the throttle and the trans would have to *decide* what gear it wanted to be in.
I can't say it's a "post fix" thing. I've experienced this problem across my last few cars - IMO it's a transmission calibration thing. My old Audi A6 (6sp auto) and GMC Sierra (also a 6sp auto) seemed to want to get to the higher gear ASAP and as such, I'd catch it with it's pants down sometimes when I'd nail the throttle and the trans would have to *decide* what gear it wanted to be in.
The Pontaic G8 GT owners like myself could purchase SuperChips handheld tuners that would allow us to choose how firm we wanted our shifts to be, from a nice 25% increase to 150% where the transmission would shift so hard that the LSD rear would leave rubber in between shfits because they were so firm, the increase eliminated the downshift lag, the same lag we all seem to get in our CD's.
Does the same transmission in the gas powered Cayennes 958.2's have the same delay vs the diesel?
#5494
Burning Brakes
Ok, then it is simply the way that the mfg's have things set up, with the delay and all.
It makes me laugh when guys say that it is a safety issue, as if vehicles that take a little longer to go through an intersection or merge into traffic are suddenly, in 2017/2018, the delay is causing others to pinball into those with a transmission delay and that it is happening all over the USA. Makes me think of the decades of shytboxes with carbueretors and just junkers in general, and how awful the response was back then, those of us who had to endure the 1972 Chevelle's, 1974 Chrysler Sebring Plus, 1976 Chevy Nova-and the list can go on and on and on with all those POS that littered the roads in the mid to late 80's and into the 90's but that are all but gone now, but somehow, in 2018 we demand perfection from these machines, and in a way, we should, so I'm a hypocrite.
I'll bet the delay is to prolong transmission life.
It makes me laugh when guys say that it is a safety issue, as if vehicles that take a little longer to go through an intersection or merge into traffic are suddenly, in 2017/2018, the delay is causing others to pinball into those with a transmission delay and that it is happening all over the USA. Makes me think of the decades of shytboxes with carbueretors and just junkers in general, and how awful the response was back then, those of us who had to endure the 1972 Chevelle's, 1974 Chrysler Sebring Plus, 1976 Chevy Nova-and the list can go on and on and on with all those POS that littered the roads in the mid to late 80's and into the 90's but that are all but gone now, but somehow, in 2018 we demand perfection from these machines, and in a way, we should, so I'm a hypocrite.
I'll bet the delay is to prolong transmission life.
Last edited by BenCD; 05-03-2018 at 03:49 PM.
#5495
I dunno.... basing my decision on motorcycle experience (as most cars were already fuel injected by the time I started driving).... it's taken a while for FI to catch up to the initial responsiveness of a carburetor.
The only time I'd consider it a "safety issue" is when I'm trying to make a quick move. And then, is it really a "safety" issue with the car, getting in the way of making and aggressive move?
I'll say the delay IS long enough to create a panic reaction internally. All these years driving various vehicles that do this and it still "catches" me.
On my GMC I could mostly correct the issue by putting the transmission in a funky mode that disabled something. I can't remember what it was as it was ~2 years ago now, but if you held down the "Tow/Haul" button for 5 seconds, it would pop up a message on the DIC that something was disabled. The whole vehicle was WAY more responsive after that.
But yes - the delay in actual response from the engine when you hit the pedal is probably to protect the trans. The trans decides what it's going to do, THEN the PCM allows the engine to send torque.
I think it's just a transmission calibration thing. Too many gears to choose from, plus a design/desire by the manufacturers to keep emissions low and fuel economy high.
The only time I'd consider it a "safety issue" is when I'm trying to make a quick move. And then, is it really a "safety" issue with the car, getting in the way of making and aggressive move?
I'll say the delay IS long enough to create a panic reaction internally. All these years driving various vehicles that do this and it still "catches" me.
On my GMC I could mostly correct the issue by putting the transmission in a funky mode that disabled something. I can't remember what it was as it was ~2 years ago now, but if you held down the "Tow/Haul" button for 5 seconds, it would pop up a message on the DIC that something was disabled. The whole vehicle was WAY more responsive after that.
But yes - the delay in actual response from the engine when you hit the pedal is probably to protect the trans. The trans decides what it's going to do, THEN the PCM allows the engine to send torque.
I think it's just a transmission calibration thing. Too many gears to choose from, plus a design/desire by the manufacturers to keep emissions low and fuel economy high.
#5496
Rennlist Member
Ok, then it is simply the way that the mfg's have things set up, with the delay and all.
It makes me laugh when guys say that it is a safety issue, as if vehicles that take a little longer to go through an intersection or merge into traffic are suddenly, in 2017/2018, the delay is causing others to pinball into those with a transmission delay and that it is happening all over the USA. Makes me think of the decades of shytboxes with carbueretors and just junkers in general, and how awful the response was back then, those of us who had to endure the 1972 Chevelle's, 1974 Chrysler Sebring Plus, 1976 Chevy Nova-and the list can go on and on and on with all those POS that littered the roads in the mid to late 80's and into the 90's but that are all but gone now, but somehow, in 2018 we demand perfection from these machines, and in a way, we should, so I'm a hypocrite.
I'll bet the delay is to prolong transmission life.
It makes me laugh when guys say that it is a safety issue, as if vehicles that take a little longer to go through an intersection or merge into traffic are suddenly, in 2017/2018, the delay is causing others to pinball into those with a transmission delay and that it is happening all over the USA. Makes me think of the decades of shytboxes with carbueretors and just junkers in general, and how awful the response was back then, those of us who had to endure the 1972 Chevelle's, 1974 Chrysler Sebring Plus, 1976 Chevy Nova-and the list can go on and on and on with all those POS that littered the roads in the mid to late 80's and into the 90's but that are all but gone now, but somehow, in 2018 we demand perfection from these machines, and in a way, we should, so I'm a hypocrite.
I'll bet the delay is to prolong transmission life.
Mine's been reflashed and I was advised to put some miles on it before making any conclusions. However, just the other day, I hit the accelerator pressing it about a third of the way to the floor. Normal mode, not Sport. Nothing happened. Nothing happened for so long I was able to look down, note I was going 22 MPH and the RPM was not rising. Nothing. Nada. After 2-3 seconds of looking at the speedo and tach, RPMs slowly started up and then, at about 2200 the turbo kicked in and off I went. I kept watching and saw, on several occasions (again, in 3rd gear ~20something MPH) the tach needle jump up (with no corresponding sound or acceleration), then return to the original RPM, where it gradually started to rise and accelerate a la a loaded dump truck or '80s 300D.
Sport mode still seems to be there, but it may be fading away, again, too. More time to write an accurate "Customer Reports" section.
#5497
Rennlist Member
I wrote those posts and can tell you that they certainly didn't perform like the original. You make an interesting point about the placebo effect. It is spot on, and I blame Porsche, because they made changes to the car, and our minds are finding real and perceived differences.
#5498
Addict
Rennlist Member
Rennlist Member
My 2010 Touareg TDI had lag in normal mode but in sport mode it took off with no delay that I could sense, similar to my current Cayenne GTS with the V8.
When I tested a fixed CD, there was really bad lag in both normal and sport mode. The sport button didn’t seem to make any difference. Furthermore, when the turbos kicked in, it was so forceful, that I’d be concerned about potential loss of control if the front wheels weren’t pointed straight ahead.
When I tested a fixed CD, there was really bad lag in both normal and sport mode. The sport button didn’t seem to make any difference. Furthermore, when the turbos kicked in, it was so forceful, that I’d be concerned about potential loss of control if the front wheels weren’t pointed straight ahead.
#5499
Update
Hello All, New ‘15 CD owner here and just wanted to say that I love the CD but the hesitation from a rolling stop is awful. Going to take it in and see if there is anything they can do with it. Have only had it for a month so still getting accustomed to it. Wish I could have driven a pre-fix one to compare.
#5500
Rennlist Member
I have a 2014 Touareg TDI. I had the software "fix" done a few weeks ago. Things that I notice.
The car has a lot more Turbo lag
Sport mode seems non existent
Fuel economy went down
Performance feels low
Does anyone know if there is an aftermarket solution? I love the vehicle but it's not what I signed up for. Much appreciate any advice.
The car has a lot more Turbo lag
Sport mode seems non existent
Fuel economy went down
Performance feels low
Does anyone know if there is an aftermarket solution? I love the vehicle but it's not what I signed up for. Much appreciate any advice.
#5501
Rennlist Member
Originally Posted by santib
Wife took CD to dealer and had Tech drive the vehicle. Tech noticed the issue before even leaving the lot. Left vehicle with dealer and was told they found a loose boost hose causing the lag but that there where no codes or errors in the system. I have not had a chance to drive it since we got it back but my wife says it’s night and day better.
#5502
Wonder if Belgian diesels have to get the 'fix'?
2010 Cayenne Diesel with 711,499 kms on the clock. Photo from a Facebook post:
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https://rennlist.com/forums/cayenne-955-957-2003-2010/968788-meet-otis.html
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2010 Cayenne Diesel with 711,499 kms on the clock. Photo from a Facebook post:
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https://rennlist.com/forums/cayenne-955-957-2003-2010/968788-meet-otis.html
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Last edited by RS-America; 05-06-2018 at 10:19 PM. Reason: format
#5503
Rennlist Member
Originally Posted by RS-America
Wonder if Belgian diesels have to get the 'fix'?
2010 Cayenne Diesel with 711,499 kms on the clock. Photo from a Facebook post:
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https://rennlist.com/forums/cayenne-955-957-2003-2010/968788-meet-otis.html
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2010 Cayenne Diesel with 711,499 kms on the clock. Photo from a Facebook post:
________________________
https://rennlist.com/forums/cayenne-955-957-2003-2010/968788-meet-otis.html
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#5504
Rennlist Member
Wife took CD to dealer and had Tech drive the vehicle. Tech noticed the issue before even leaving the lot. Left vehicle with dealer and was told they found a loose boost hose causing the lag but that there where no codes or errors in the system. I have not had a chance to drive it since we got it back but my wife says it’s night and day better.
#5505
Rennlist Member
^^^ Maybe have to retrofit with something like this once the courtesy warranty expires:
https://www.boost-products.eu/en/col...s-line/a-2240/
https://www.boost-products.eu/en/col...s-line/a-2240/