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Knock/thump under driver?

ajkress

Member
Dec 9, 2020
7
1
Pittsburgh
Hey everyone - picked up MY in late December and loving it so far. Two quick questions that I haven't been able to find much information on:

1. I make a left-hand turn into my parking lot at work and there's a small lip to drive over to transition from the road and into the parking lot. Just about everyday when doing so there's a single 'thump' or a light 'knock' under my feet on the driver side. It seems to happen infrequently (i.e. does not when driving on a flat road), but does seem to happen frequently when the car weight shifts when going over a transition in the pavement. Do you guys think this is a cause for concern - i.e. suspension issue? I've read you can hear a knocking/popping from the battery "breathing" but this seems to be isolated to the car tackling pavement transitions into parking lots.

2. Are your driver side wipers unable to clean the lower quarter of the windshield? Lots of salt residue on the roads, and even when pumping through lots of washer fluid (+5-10 seconds), the bottom of the windshield just doesn't get wet to clean. Wasn't sure if this was an isolated incident and need a new blade, or could be a tension issue with the wiper arm.

Any input is appreciated, thanks everyone and happy driving.
 

Pianewman

Active Member
Oct 28, 2020
1,100
751
Fort Worth
I'd offer that any "clunk" from the suspension should get checked out, first by your SC, and then, since they'll possibly say, "It's normal.", I'd visit a reputable FE shop.
Battery sounds occur only while charging, for me, only at a SuperCharger, not my home charger.
Wipers? I can't help. I've not had my car out in the rain/snow.
 

telsaone

New Member
Feb 22, 2021
3
0
MA
Hi ajkess - I have the same issue as you, but my "click/pop/thud" (or whatever you want to call it) happens in the exact same situation as you. Only difference is my noise is coming from the rear right trunk area. It only happens when pulling into my steep and uneven driveway. I have an appointment with service to address the issue, but am concerned about being able to replicate it. I got a video of it for them... I also posted on the Tesla forum, and heard from a poster that he also had the issue. He said service fixed it by tightening up suspension. Fingers crossed for both of us!
 

dandw2

Member
Feb 3, 2020
33
20
New Hampshire
2. Are your driver side wipers unable to clean the lower quarter of the windshield? Lots of salt residue on the roads, and even when pumping through lots of washer fluid (+5-10 seconds), the bottom of the windshield just doesn't get wet to clean. Wasn't sure if this was an isolated incident and need a new blade, or could be a tension issue with the wiper arm.

Any input is appreciated, thanks everyone and happy driving.

yes, same situation - our's was "blocked" at first because it didn't work. Now it works, but still leaves 1/4 of the window dirty. The mobile service guy saw it, and had just come from another with the same complaint. so it is not isolated!
 

Needsdecaf

Active Member
Dec 16, 2018
1,268
1,793
The Woodlands, TX
The thump is likely oil-canning of the rear floor area just in front of the rear seats. At least that's the issue in the Model 3. Press down hard on the floor there, can you pop it and "bonk" it?

This also happens when supercharging at times...pack heats up and makes the metal expand and "pop".
 

Koolio46

Member
Aug 26, 2020
476
197
Boston, MA
Hey everyone - picked up MY in late December and loving it so far. Two quick questions that I haven't been able to find much information on:

1. I make a left-hand turn into my parking lot at work and there's a small lip to drive over to transition from the road and into the parking lot. Just about everyday when doing so there's a single 'thump' or a light 'knock' under my feet on the driver side. It seems to happen infrequently (i.e. does not when driving on a flat road), but does seem to happen frequently when the car weight shifts when going over a transition in the pavement. Do you guys think this is a cause for concern - i.e. suspension issue? I've read you can hear a knocking/popping from the battery "breathing" but this seems to be isolated to the car tackling pavement transitions into parking lots.

2. Are your driver side wipers unable to clean the lower quarter of the windshield? Lots of salt residue on the roads, and even when pumping through lots of washer fluid (+5-10 seconds), the bottom of the windshield just doesn't get wet to clean. Wasn't sure if this was an isolated incident and need a new blade, or could be a tension issue with the wiper arm.

Any input is appreciated, thanks everyone and happy driving.
If I'm interpreting your 'thunk' sound correctly, I get this sound in the same location...but only when I drive over certain bumps in the (city) roads. It doesn't happen all the time and really only occurs when the wheel drops vs when the suspension is being compressed.

The interesting thing for me was the sound went away for about a month or so after I had a 4 wheel alignment but it came back...not as loud or as frequent but it did come back.
 

ajkress

Member
Dec 9, 2020
7
1
Pittsburgh
Hi ajkess - I have the same issue as you, but my "click/pop/thud" (or whatever you want to call it) happens in the exact same situation as you. Only difference is my noise is coming from the rear right trunk area. It only happens when pulling into my steep and uneven driveway. I have an appointment with service to address the issue, but am concerned about being able to replicate it. I got a video of it for them... I also posted on the Tesla forum, and heard from a poster that he also had the issue. He said service fixed it by tightening up suspension. Fingers crossed for both of us!

Replicating it is also my concern - on a 30 minute drive, it will happen only ~50% of the time (although generally under the same conditions of the car hitting a lip/uneven surface). I've tried taking the transition slowly at ~1 mph and will still get that same sound/knock. Let me know if you get any feedback from the service tech. I may end up scheduling one myself.

If I'm interpreting your 'thunk' sound correctly, I get this sound in the same location...but only when I drive over certain bumps in the (city) roads. It doesn't happen all the time and really only occurs when the wheel drops vs when the suspension is being compressed.

The interesting thing for me was the sound went away for about a month or so after I had a 4 wheel alignment but it came back...not as loud or as frequent but it did come back.

That's good insight and given the feel of the "knock" and it being only a single knock when the car is put in a position where all four wheels aren't perfectly on even pavement may be the culprit. I'm guessing if it's oil-canning of the floor metal, there's not much to be done, but alternatively, not much of a concern since it's not the suspension.

yes, same situation - our's was "blocked" at first because it didn't work. Now it works, but still leaves 1/4 of the window dirty. The mobile service guy saw it, and had just come from another with the same complaint. so it is not isolated!

Thanks for the feedback, glad to know I'm not alone. So it sounds like a design flaw in the 'spray' pattern off of the wiper blades. I'm hoping once the salt trucks go away for the season the impact is minimal with rain. Thankfully it's not as bad as a faulty wiper arm I had on my X5 that wouldn't clean my entire passenger side of the windshield. BMW still couldn't address the issue after years of complaints.
 
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