Rough drivetrain clattering ONLY upon initial/cold driving & odd scenario....
09-26-2017, 07:29 AM
#1
Rough drivetrain clattering only when cold & driving uphill. Anyone else have it?
When first starting my car for the day (engine/drivetrain cold), and pulling out of my garage, I have to drive up a moderately slanted hill to get to the first stop sign (I maybe get to about 20 MPH). During this slight uphill load to the drivetrain, I get this metallic/shuddering/clattering sound that even transmits enough of a feeling into the cabin that I have to let off the gas because I'm afraid of breaking something. If I accelerate hard and "push through," the car shakes it off and pushes through it. It is definitely not lugging the engine, and the car is in first gear the whole time.
It ONLY happens when the car is FIRST being driven, and going uphill. I.e, if I start the car for the day and drive on even roads, I wouldn't even know the "issue" (if it is an issue and not "normal") exists. It's so uniquely dependent upon being this EXACT scenario (first drive of the day, immediate uphill drive) that if you've never turned your car on and driven uphill, you wouldn't even know if your car exhibits said characteristic. Once I've driven it for about 30 seconds (that's all it takes) the car no longer will do it and will go uphill normally. Also, the amount of time I let the car idle has no effect whatsoever. How quickly it goes uphill and then how long it's been driven after is all that determines when it'll happen, and when it'll stop happening.
Anybody ever notice this or have an idea of what it should be? It's the WEIRDEST thing. Otherwise, the car runs and performs like brand new. 2012.5, 18K miles, C2, PDK, S/C.
It ONLY happens when the car is FIRST being driven, and going uphill. I.e, if I start the car for the day and drive on even roads, I wouldn't even know the "issue" (if it is an issue and not "normal") exists. It's so uniquely dependent upon being this EXACT scenario (first drive of the day, immediate uphill drive) that if you've never turned your car on and driven uphill, you wouldn't even know if your car exhibits said characteristic. Once I've driven it for about 30 seconds (that's all it takes) the car no longer will do it and will go uphill normally. Also, the amount of time I let the car idle has no effect whatsoever. How quickly it goes uphill and then how long it's been driven after is all that determines when it'll happen, and when it'll stop happening.
Anybody ever notice this or have an idea of what it should be? It's the WEIRDEST thing. Otherwise, the car runs and performs like brand new. 2012.5, 18K miles, C2, PDK, S/C.
Last edited by K-A; 02-20-2018 at 11:58 AM.
09-26-2017, 10:40 PM
#4
Yeah been meaning to do that. I’m just hoping it picks up the sound right.
Btw, I was coming out of a much steeper driveway than mine today, while the car was warm, and while at a steep angle (to avoid scraping) I felt this odd sensation in the brakes. Like I can feel some part of the drivetrain flexing and pulling as the chassis was at said extreme angle. Could it be common that maybe something down there that holds the transmission in place gets loose?
Btw, I was coming out of a much steeper driveway than mine today, while the car was warm, and while at a steep angle (to avoid scraping) I felt this odd sensation in the brakes. Like I can feel some part of the drivetrain flexing and pulling as the chassis was at said extreme angle. Could it be common that maybe something down there that holds the transmission in place gets loose?
10-30-2017, 06:36 AM
#5
So I still haven’t taken it to the dealer for this. It seems to happen randomly. Always when cold, and always at a light to moderate gas input. I took a video, and if you listen closely, you can hear these little “pop/creak/clatter/shudder” sounds. It sounds more metallic in real life. It goes away very quickly when it does happen, but it almost feels like the transmission wants to drop out while it’s happening. Other than that brief and occasional hiccup, the car drives flawlessly.
Any my idea on what it could be? Anyone else has this exact issue? Want to be prepared for the dealer as I’m sure this one won’t be “reproduce” friendly.
Any my idea on what it could be? Anyone else has this exact issue? Want to be prepared for the dealer as I’m sure this one won’t be “reproduce” friendly.
10-30-2017, 09:34 AM
#7
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10-31-2017, 09:39 AM
#8
Rennlist Member
Sounds normal, if you are speaking about the GT3! Not normal for the C2 or C2S.
10-31-2017, 09:42 AM
#9
12-09-2017, 10:02 PM
#10
Wanted to share this video I took. The sound is a lot more metallic in person, but this gives an idea. I have to literally let off the gas because it starts clattering and shaking so much. Feels like something is loose almost.
Again, odd thing is it seems to only happen after I make a steep left (at an extreme angle as I have to do) from a driveway onto a street, ONLY when I first drive the car for the day and the car is cold, then it doesn’t do it at all after that one instance. I can hear a little bit of that grating metallic sound for a couple minutes while it warms up, but the shaking and actual affect to the drive is only for a second, until I get to the first stop sign. Otherwise drives perfectly.
Will take it in of course, but would like to be as prepared for their “cannot replicate” stuff as possible.
EDIT: Whoops, just scrolled up and realized I already posted another video of it before, lol.
Guess I’ll just have to figure it out when I take it in. Or if it sounds familiar to someone, please chime in.
Again, odd thing is it seems to only happen after I make a steep left (at an extreme angle as I have to do) from a driveway onto a street, ONLY when I first drive the car for the day and the car is cold, then it doesn’t do it at all after that one instance. I can hear a little bit of that grating metallic sound for a couple minutes while it warms up, but the shaking and actual affect to the drive is only for a second, until I get to the first stop sign. Otherwise drives perfectly.
Will take it in of course, but would like to be as prepared for their “cannot replicate” stuff as possible.
EDIT: Whoops, just scrolled up and realized I already posted another video of it before, lol.
Guess I’ll just have to figure it out when I take it in. Or if it sounds familiar to someone, please chime in.
12-13-2017, 12:12 PM
#11
I have this noise with my 2017 GTS as well. For me when I pull out of my garage and make it to the first stop sign traveling at 35km/hr, the car feels like it is in 2nd gear (PDK) and then when it shifts from 2nd to 1st gear I get that metallic grinding noise. Once the car has warmed up and even at the next stop sign, it disappears. I plan on bringing this up at the first scheduled appointment next year. For me it definitely feels like the tranny.
12-13-2017, 06:50 PM
#12
I have this noise with my 2017 GTS as well. For me when I pull out of my garage and make it to the first stop sign traveling at 35km/hr, the car feels like it is in 2nd gear (PDK) and then when it shifts from 2nd to 1st gear I get that metallic grinding noise. Once the car has warmed up and even at the next stop sign, it disappears. I plan on bringing this up at the first scheduled appointment next year. For me it definitely feels like the tranny.
12-13-2017, 07:34 PM
#13
I used to get that noise leaving the office garage, right after startup on a cold engine/trans, while going up the first couple of ramps. Perfectly normal as I understand it.
12-14-2017, 03:39 AM
#15
Interesting. Did you just hear it, or did it also make for a rough and clattery drivetrain feel while it was happening?