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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old Today, 03:19 AM   #1
aj0294
 
Drives: 2010 Camaro 2SS/RS
Join Date: Nov 2013
Location: Tuscaloosa, AL
Posts: 4
Please help!

Okay I'm completely clueless as to what's going on with the car. To begin with, I have a 2010 SS (l99) with 65,000 miles. Now my problem is engine noise. It sounds as if it's lugging (or like the sound you get at a speed too low for a gear) and sends vibrations throughout the car. The only time this happens is when I accelerate between 70-80 mph, anything faster than 83, it goes away. Anything slower than 72, it doesn't exist... only happens during a normal acceleration. However, this doesn't happen all the time, it'll come and go. If I floor it I wont get the noise at all. None of this started until about a month ago (when the weather started getting cooler). There is no check engine light and a diagnostic showed no code.

Side note: Every time i fill up with ethanol free gasoline I don't have this problem at all.
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Old Today, 12:32 PM   #2
PalmerGA


 
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Drives: 2013 SIM 1SS/RS L99
Join Date: May 2012
Location: Southwest GA
Posts: 6,781
Not sure what's causing your problem. Sounds like you should keep using E-Free gas. Be patient... someone here probably knows the problem and the cure.

Just curious but, is your AFM active or do you have it tuned out (or a Range device installed)? Sounds like the lag/stumble when accelerating and the engine kicks from 4 to 8 cylinder mode, although I would think you notice it some a slower speeds as well... just not as noticeable.
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Old Today, 01:05 PM   #3
aj0294
 
Drives: 2010 Camaro 2SS/RS
Join Date: Nov 2013
Location: Tuscaloosa, AL
Posts: 4
AFM is active and there is a slight problem about E-free gas; where I am located, there is no gas station that sells it. The only time I'm able to get it is when I visit family in another state. And I have noticed it at a slower speed before, but it's EXTREMELY faint.
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