SL55/63/65/R230 AMG: SL55 Hesitation/Lag - Help needed!
Thread Starter
Member
Joined: Mar 2013
Posts: 93
Likes: 6
SL55 AMG
SL55 Hesitation/Lag - Help needed!
Hi guys,
I have an 06 SL55 which has been running great the past couple weeks. I began noticing lots of lag/hesitation while WOT and feel as if the supercharger isn't fully activating. I have replaced the CPS, fuel pump and fuel pump relay module just a few days ago. My Johnson CM-30 pump was put in about 6k miles ago. I have a 180mm ASP pulley, Shardul BWK, EC tune. The car does not reach the speeds in such a quick manner as it used to. In fact, I just put the EC tune in today thinking it would fix the issue, however, the lag is still there. I have no idea what this may be and it's driving me crazy! This car does not feel like a 493HP supercharged rocket, and nowhere close to the 551HP it should be at with the current mods. I had an indie check the boost and he says it is at 1.2 bar and says the car runs fine. I know how this car runs, and it is NOT running the way it should be.
Can any of you chime in on what you believe it may be?
I have an 06 SL55 which has been running great the past couple weeks. I began noticing lots of lag/hesitation while WOT and feel as if the supercharger isn't fully activating. I have replaced the CPS, fuel pump and fuel pump relay module just a few days ago. My Johnson CM-30 pump was put in about 6k miles ago. I have a 180mm ASP pulley, Shardul BWK, EC tune. The car does not reach the speeds in such a quick manner as it used to. In fact, I just put the EC tune in today thinking it would fix the issue, however, the lag is still there. I have no idea what this may be and it's driving me crazy! This car does not feel like a 493HP supercharged rocket, and nowhere close to the 551HP it should be at with the current mods. I had an indie check the boost and he says it is at 1.2 bar and says the car runs fine. I know how this car runs, and it is NOT running the way it should be.
Can any of you chime in on what you believe it may be?
Super Member
Joined: Jul 2014
Posts: 992
Likes: 245
From: Tucson, AZ
'20 X5 M50i; '17 Ram 3500; Golf Cart; Bikes; Scooters
I'll throw you a bone. Since the issue is at WOT it might be fuel flow. Have you ever replaced the fuel filter? If clogged it would starve for fuel.
Check the air filters too. It sounds like it is starving for something.
Check the air filters too. It sounds like it is starving for something.
Senior Member
Joined: Sep 2007
Posts: 255
Likes: 3
2003 SL55 Klemman
I just experienced this issue not too long ago. In my case my ecu was not supplying the correct voltage to my 02 sensors and was getting an error from the o2 sensor. Since i didnt want to fork out $1200 for a new ecu I sent the ecu to kleeman they turned off the rear o2 signal so the ecu just ignores it and the car is now running right again.
Trending Topics
MBWorld Fanatic!
Joined: Feb 2009
Posts: 6,897
Likes: 85
From: Central WI (BFE)
SL55, ML500 & Acura TL
Correct, not in the secondaries. I removed my secondaries long ago with no codes no issues. As I understand it, the secondaries were installed as part of a future EU emissions requirement.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Member
Joined: Aug 2010
Posts: 155
Likes: 5
From: michigan
04 E55/04 SL55/R35 GTR
Hi guys,
I have an 06 SL55 which has been running great the past couple weeks. I began noticing lots of lag/hesitation while WOT and feel as if the supercharger isn't fully activating. I have replaced the CPS, fuel pump and fuel pump relay module just a few days ago. My Johnson CM-30 pump was put in about 6k miles ago. I have a 180mm ASP pulley, Shardul BWK, EC tune. The car does not reach the speeds in such a quick manner as it used to. In fact, I just put the EC tune in today thinking it would fix the issue, however, the lag is still there. I have no idea what this may be and it's driving me crazy! This car does not feel like a 493HP supercharged rocket, and nowhere close to the 551HP it should be at with the current mods. I had an indie check the boost and he says it is at 1.2 bar and says the car runs fine. I know how this car runs, and it is NOT running the way it should be.
Can any of you chime in on what you believe it may be?
I have an 06 SL55 which has been running great the past couple weeks. I began noticing lots of lag/hesitation while WOT and feel as if the supercharger isn't fully activating. I have replaced the CPS, fuel pump and fuel pump relay module just a few days ago. My Johnson CM-30 pump was put in about 6k miles ago. I have a 180mm ASP pulley, Shardul BWK, EC tune. The car does not reach the speeds in such a quick manner as it used to. In fact, I just put the EC tune in today thinking it would fix the issue, however, the lag is still there. I have no idea what this may be and it's driving me crazy! This car does not feel like a 493HP supercharged rocket, and nowhere close to the 551HP it should be at with the current mods. I had an indie check the boost and he says it is at 1.2 bar and says the car runs fine. I know how this car runs, and it is NOT running the way it should be.
Can any of you chime in on what you believe it may be?
