Car drives like crap after touchless car wash
Thread Starter
Junior Member
Joined: Dec 2017
Posts: 44
Likes: 4
Lexus IS
Car drives like crap after touchless car wash
I have a 2021 w205 C63 sedan. Drove the car through a touchless car wash (used this one before no problems) it has the underside spray as well when you enter the tunnel. Anyways, car feels sluggish after car wash at WOT.
No lights on the dashboard or anything, but even 30-45 mins after wash (with continuous normal driving) when I floor it (double click) it downshifts and goes like usual but it feels like someone cut the power from about 4k rpm to redline.
It usually pulls super hard in that range, but now it feels super meh and sluggish.
Anyone else experience this?
Any ideas what this could be?
Car is stock. No tunes.
I tried in S and S+ from a rolling 35-40mph. Traction on. It always pulls hard.
This time after the wash, it feels like someone attached a parachute to my car. Never had this happen before and I use the touchless washes all the time.
Thanks
No lights on the dashboard or anything, but even 30-45 mins after wash (with continuous normal driving) when I floor it (double click) it downshifts and goes like usual but it feels like someone cut the power from about 4k rpm to redline.
It usually pulls super hard in that range, but now it feels super meh and sluggish.
Anyone else experience this?
Any ideas what this could be?
Car is stock. No tunes.
I tried in S and S+ from a rolling 35-40mph. Traction on. It always pulls hard.
This time after the wash, it feels like someone attached a parachute to my car. Never had this happen before and I use the touchless washes all the time.
Thanks
Out Of Control!!
Joined: Nov 2018
Posts: 11,462
Likes: 5,354
From: San Francisco Bay Area
2019 C63CS
First off, you are in the wrong forum. The W205 forum is here: https://mbworld.org/forums/c63-c63s-amg-215/. This one is for the upcoming W206.
Not sure how a car wash would cause this. When it comes to water, an electronics failure is more likely if it leaks somewhere or worst case a hydrolocked engine if water got into the intakes and into the cylinders but that would seize the engine. I guess one option is that water did get into the intake and soaked your air filters, but luckily didn't go further. I would definitely check out the air filters as if they are wet, the water can overtime get into the engine and cause a bigger mess.
Not sure how a car wash would cause this. When it comes to water, an electronics failure is more likely if it leaks somewhere or worst case a hydrolocked engine if water got into the intakes and into the cylinders but that would seize the engine. I guess one option is that water did get into the intake and soaked your air filters, but luckily didn't go further. I would definitely check out the air filters as if they are wet, the water can overtime get into the engine and cause a bigger mess.
Thread Starter
Junior Member
Joined: Dec 2017
Posts: 44
Likes: 4
Lexus IS
Ok update.
I looked at my engine data. Boost bar fills up, tq hits 479 before dropping off at 5kish like usual. HOWEVER, HP never goes above 330.
No wonder this thing feels slow af. I don’t understand how the car is giving 479lb of tq, but only 330hp instead of the 469hp. So bizarre.
Any ideas?
I looked at my engine data. Boost bar fills up, tq hits 479 before dropping off at 5kish like usual. HOWEVER, HP never goes above 330.
No wonder this thing feels slow af. I don’t understand how the car is giving 479lb of tq, but only 330hp instead of the 469hp. So bizarre.
Any ideas?
Out Of Control!!
Joined: Nov 2018
Posts: 11,462
Likes: 5,354
From: San Francisco Bay Area
2019 C63CS
That sounds like your car is in power limp mode. Happens when there was a power failure and needs to be reset by a dealer. You may have some electrical components exposed and water got into them causing an electrical failure. Did you read out the error codes to see if anything got logged?
