tuned e55 slight lump in idle
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Joined: Oct 2016
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From: New York
2005 CL55 (sold) C63 Coupe 2012 p31(sold) Audi 330awhp E55 511WHP(sold)Z06C6 550whp C63 LTH
tuned e55 slight lump in idle
Bought a OBD2 to check it out, all i got was errors for not having the Secondary O2 sensors in but im pretty sure thats not causing this issue. I couldnt find any leaks and it is not showing up as a code, should i clean out my throttle body?? even if it doesnt show up as a code. its a minor lump in the idle and it only happens in park and neutral. Car runs real good.
Thread Starter
Senior Member
Joined: Oct 2016
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From: New York
2005 CL55 (sold) C63 Coupe 2012 p31(sold) Audi 330awhp E55 511WHP(sold)Z06C6 550whp C63 LTH
put in brand new NGK one step colder plugs, car was fine till I did the spark plugs and went catless it was done in one shot. The tune didn't knock it out. I'm assuming it's maybe the throttle body needing to be cleaned. But I didn't have this problem till I brought it to do do this work.
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E55 amg
If the car has one step colder plugs and headers then you could a expect a slight Little Rock type feel that Avery minor when parked as long as you got no codes miss fored and runs strong your good to go
Thread Starter
Senior Member
Joined: Oct 2016
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From: New York
2005 CL55 (sold) C63 Coupe 2012 p31(sold) Audi 330awhp E55 511WHP(sold)Z06C6 550whp C63 LTH
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From: Tampa Bay, FL
05 E55, 98 CLK320
I even googled it to find out what you mean but I don't get it... little rock feel??
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From: Christchurch, New Zealand
CLS55
A intermittent ever so slight shudder of mine is anything to go off. By intermittent I mean its smooth, shudders slightly back to smooth then small shudder. I guess? Description words lol
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From: Tampa Bay, FL
05 E55, 98 CLK320
Yeah that makes sense. Mine shakes consistently like a muscle car (which it is a muscle car really lol)
Thread Starter
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From: New York
2005 CL55 (sold) C63 Coupe 2012 p31(sold) Audi 330awhp E55 511WHP(sold)Z06C6 550whp C63 LTH
It's bc of the headers I'm pretty sure but the spark plugs too, I have no CEL for misfire so It's just a normal hiccup I'm assuming. My car idle fine and when I did the spark plugs and catless headers(one shot) it gave me the slightly rough idle. I would've cleaned my throttle body and MAF sensor but if it was good before this why would I. So I'm gonna go with tuning to ease the hiccup but the car drives 100% normal no hiccup it's the idle in park
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E55 amg
Yes,very normal after headers more some L.T it's just getting so much more flow now.
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E55 amg
It's bc of the headers I'm pretty sure but the spark plugs too, I have no CEL for misfire so It's just a normal hiccup I'm assuming. My car idle fine and when I did the spark plugs and catless headers(one shot) it gave me the slightly rough idle. I would've cleaned my throttle body and MAF sensor but if it was good before this why would I. So I'm gonna go with tuning to ease the hiccup but the car drives 100% normal no hiccup it's the idle in park
Thread Starter
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Joined: Oct 2016
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From: New York
2005 CL55 (sold) C63 Coupe 2012 p31(sold) Audi 330awhp E55 511WHP(sold)Z06C6 550whp C63 LTH
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2003 E55 AMG 2001 911 Turbo
Just wanted to comment I have a similar rough idle after going to Eurocharged headers. I can't tell its rough until I turn the stereo off and really feel for it. I eliminated my primary cats while doing the headers.
No CEL for misfire.
In chasing this rough idle condition down I replaced the following with no change:
Lemforder motor mounts x2
Lemforder transmission mount
Bosch Sparkplugs FR6MPP332
Valve cover gaskets - checked crank breathers for poor connections
Confirmed okay plug wire resistance
Had I not found this thread I would be taking a good hard look at my coil packs but the car pulls hard.
I will probably replace the pulley and tune once the weather warms up.
No CEL for misfire.
In chasing this rough idle condition down I replaced the following with no change:
Lemforder motor mounts x2
Lemforder transmission mount
Bosch Sparkplugs FR6MPP332
Valve cover gaskets - checked crank breathers for poor connections
Confirmed okay plug wire resistance
Had I not found this thread I would be taking a good hard look at my coil packs but the car pulls hard.
I will probably replace the pulley and tune once the weather warms up.
Thread Starter
Senior Member
Joined: Oct 2016
Posts: 387
Likes: 18
From: New York
2005 CL55 (sold) C63 Coupe 2012 p31(sold) Audi 330awhp E55 511WHP(sold)Z06C6 550whp C63 LTH
Im beginning to think that idle is just something we have to deal with or the fueling is off, maybe pumps are not giving enough gas to support the setup
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E55 amg
Just wanted to comment I have a similar rough idle after going to Eurocharged headers. I can't tell its rough until I turn the stereo off and really feel for it. I eliminated my primary cats while doing the headers.
No CEL for misfire.
In chasing this rough idle condition down I replaced the following with no change:
Lemforder motor mounts x2
Lemforder transmission mount
Bosch Sparkplugs FR6MPP332
Valve cover gaskets - checked crank breathers for poor connections
Confirmed okay plug wire resistance
Had I not found this thread I would be taking a good hard look at my coil packs but the car pulls hard.
I will probably replace the pulley and tune once the weather warms up.
No CEL for misfire.
In chasing this rough idle condition down I replaced the following with no change:
Lemforder motor mounts x2
Lemforder transmission mount
Bosch Sparkplugs FR6MPP332
Valve cover gaskets - checked crank breathers for poor connections
Confirmed okay plug wire resistance
Had I not found this thread I would be taking a good hard look at my coil packs but the car pulls hard.
I will probably replace the pulley and tune once the weather warms up.
Also ,carbon build up and dirty fuel system can do this too.
\Some m113k setups just idle this way ,as long as it's not ruff in drive it's fine.If you want silky smooth idles stick with a Honda or so..
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Joined: Mar 2008
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E550
Not sure if my previous reply got posted. I scrolled up and saw you have headers. Go to a shop and have them disable your downstream O2 sensors. Get a new upstream sensor. Dont expect your sensors to last more than a year. The optimum placement for O2 sensors is a max of about 12" from exhaust port. Yours are (probably) 24-36" away. That leads to variations in readings, more variability in exhaust readings and in general, more variables introduced into the AF ratio.
