S63 AMG Coupe - Engine Issues
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 23
Likes: 0
C63 AMG BS
S63 AMG Coupe - Engine Issues
Hello Fellow Enthusiasts,
Going to try to make this simple and clear.
- Renntech Airbox Upgrade
- Renntech Stage 1 Tune
*No exhaust upgrade
-Car first began having issues 3 months ago, performance was limited and car was not reaching high speeds (>120mph)
-From what my performance shop stated "a vacuum line from the turbo's was not hooked up properly, thus compromising the turbos" - Eurotech Motorsports.
-Eurotech took care of the issue, received car back after 2 months.
-After a couple weeks have passed by; today the S63 is now misfiring, without any diagnostic yet. The car seems to be struggling to maintain it's idle.
What's your input? Is this a tuning issue? Spark Plug issue? Installation Issue?
This car is now spending more time at the shop then in my garage and I want to know if the car is notorious for having similar issues? or is it the Renntech's tune?
Going to try to make this simple and clear.
- Renntech Airbox Upgrade
- Renntech Stage 1 Tune
*No exhaust upgrade
-Car first began having issues 3 months ago, performance was limited and car was not reaching high speeds (>120mph)
-From what my performance shop stated "a vacuum line from the turbo's was not hooked up properly, thus compromising the turbos" - Eurotech Motorsports.
-Eurotech took care of the issue, received car back after 2 months.
-After a couple weeks have passed by; today the S63 is now misfiring, without any diagnostic yet. The car seems to be struggling to maintain it's idle.
What's your input? Is this a tuning issue? Spark Plug issue? Installation Issue?
This car is now spending more time at the shop then in my garage and I want to know if the car is notorious for having similar issues? or is it the Renntech's tune?
Super Member
Joined: Jul 2015
Posts: 793
Likes: 22
From: NY
2001 Porsche 911 Turbo (heavily modified)
Eurotech is the best shop around. Im guessing you cant take it to dealer cause of warranty being void from Renntech stuff.
Have them run the codes with their AMG tech and see what he comes up with. He is VERY good. They all are. I wonder if yours was the one I saw a few weeks back.
Have them run the codes with their AMG tech and see what he comes up with. He is VERY good. They all are. I wonder if yours was the one I saw a few weeks back.
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 23
Likes: 0
C63 AMG BS
Eurotech is the best shop around. Im guessing you cant take it to dealer cause of warranty being void from Renntech stuff.
Have them run the codes with their AMG tech and see what he comes up with. He is VERY good. They all are. I wonder if yours was the one I saw a few weeks back.
Have them run the codes with their AMG tech and see what he comes up with. He is VERY good. They all are. I wonder if yours was the one I saw a few weeks back.
Super Member
Joined: Dec 2005
Posts: 785
Likes: 113
From: Scottsdale, Arizona
2020 S63 Coupe, 2006 Hummer H1 Alpha, 2018 McLaren 720S, 2022 Porsche 911 TurboS, 2022 Tesla Model X
I had a Renntech stage V package installed in m CLS55 back in 2007 by a well regarded local shop. Before too long I had the check engine light come on. I took it to the dealer and they found a vacuum line that got jammed under the supercharger or throttle body, can't remember which as it has been a long time. They were great and fixed it at no cost but it made me think 'what if' there was some real catastrophe... dealership would not have paid for an expensive repair nor would the local shop, I'd have been totally screwed.
My CLS63S is leased and I didn't do anything to it, except drop the suspension a little. The S63 I plan on ordering, well I might get an ECU tune but not going to mess with the mechanicals.
Anyway sorry to hear about the problems and how long you've been separated from the car, that is really frustrating considering the cost of acquisition and cost of upgrades. Hope they get it taken care of soon.
My CLS63S is leased and I didn't do anything to it, except drop the suspension a little. The S63 I plan on ordering, well I might get an ECU tune but not going to mess with the mechanicals.
Anyway sorry to hear about the problems and how long you've been separated from the car, that is really frustrating considering the cost of acquisition and cost of upgrades. Hope they get it taken care of soon.
