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Old 09-09-2010, 07:23 PM   #1
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Poor MPG and Jerking SS

I've had my 2010 SS for about a week and have noticed a couple problems.

First, the car seems to jerk sometimes when on the gas, somewhat violently and will jerk 2 or 3 times before continuing on. It mostly does it from a stop, but I can also feel it slightly when cruising at low speeds.

I think this paragraph describes it best:

"Furthermore, and something I just determined was a serious issue after last night, the car started jumping/lurching (for lack of a better description) when I gave it the gas to increase speed suddenly from approximately 10 mph to 25 mph. I would describe it as giving it gas, letting off, giving it gas, letting off repeatedly and quickly. It was jerking soooo bad, after about 3 jumps, I briefly let off of the gas for a second and then gassed it again for it to repeat the same thing again. I finally totally let off the gas and coasted a minute before applying the gas slow and steady to get it to proceed "normally". I had noticed this "jumping/lurching" a couple times before when I would pull quickly out into traffic from a stop, but played it off as me not being familiar with this kind of engine/car as it only lurched forward once before I would let off the gas and then apply it more slowly to proceed. I thought it was odd but my suspicions were only confirmed last night after that crazy incident."

From thread: http://www.camaro5.com/forums/showthread.php?t=77233

Also I am getting what I would consider poor MPG, currently at about 15.1 MPG. Any idea why? I see a lot of people getting 18-20+ MPG.
The MPG was over 16 a week ago, and seems to be getting worse and worse even though I haven't been overly aggressive with the pedal.

I have a 2010 Auto SS, I have been putting regular gas in it because the dealer told me it took regular.

I really appreciate any help.
Thank you.
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Old 09-09-2010, 07:40 PM   #2
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SS's take premium... dealer lied to you.

I got 16 flat on my SS M6... but I got on it a fair amount.
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Old 09-09-2010, 07:43 PM   #3
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SS's take premium... dealer lied to you.

I got 16 flat on my SS M6... but I got on it a fair amount.
Yeah I found that out last night, going to burn off the rest of the regular in the tank and then fill with premium. Could that be the solution to my problems?
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Old 09-09-2010, 07:46 PM   #4
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Yeah I found that out last night, going to burn off the rest of the regular in the tank and then fill with premium. Could that be the solution to my problems?
Make sure you pull the fuses after filling with premium. Do a search on here for the "fuse pull thread"

I believe they are fuses numbers 5 and 20.
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Old 09-09-2010, 07:47 PM   #5
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Yeah I found that out last night, going to burn off the rest of the regular in the tank and then fill with premium. Could that be the solution to my problems?
It should solve the MPG problem but the jerkiness... well I don't know about that.

My M6 had a horrific problem with it that I couldn't ever get solved.
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Old 09-10-2010, 08:26 AM   #6
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It will take regular but premium is recommended, it won't make the same power or run as smooth on regular. Most car reviews on the six speed auto were averaging 15 to 16 MPG, I also have a SS with six speed auto and I average 16 MPG flat. Unless you do a ton of freeway driving you won't average anywhere near the highway fuel economy listed on the sticker. What is the current average speed that your SS is showing, mine is at 31.7 MPH so you can tell I drive on the city more often.
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Old 09-10-2010, 09:04 AM   #7
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Put Premium in it after running the tank as low as you can. Run 1/4 of the Premium out of the car. Then top off again. Then that night pull fuse 5 and 20 in the engine bay fuse box. Leave fuses out overnight. Put fuses back in in the morning. Make sure after pulling the fuses you do nothing with the car while they are out. Do not open any doors, lock or unlock it or anything while they are out.

You where just given this advise by the owner of #230. Take it believe me, old timers around here will tell you I know dang well what I am talking about.
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Old 09-10-2010, 09:25 AM   #8
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Do you leave the hood open after pulling the fuses. I use 93 octane for fuel, but I have the jerkiness he is talking about as well. Once in a while it happens, seems to be when its cold usually.
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Old 09-10-2010, 12:29 PM   #9
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Do you leave the hood open after pulling the fuses. I use 93 octane for fuel, but I have the jerkiness he is talking about as well. Once in a while it happens, seems to be when its cold usually.
I had the same issue... never did figure out what it was related to.

I was thinking something in the engine was misfiring but the service guy said he found nothing. :(
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Old 09-10-2010, 07:01 PM   #10
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I appreciate all the advice, I have about half a tank of regular left until I can try premium and a fuse pull.
My average speed is about 26 MPH.

Also, I know some people say they have experienced the jerkiness while the engine was cold, I have had it while the engine was cold and hot.
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Old 09-10-2010, 08:00 PM   #11
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I'd say it is probably the lack of premium gas...

Just my $.02
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Old 09-11-2010, 12:23 AM   #12
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I'd say it is probably the lack of premium gas...

Just my $.02
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Old 09-11-2010, 12:29 AM   #13
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No worries about the jerking, it's just that the horses want to run.
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Old 09-13-2010, 10:52 AM   #14
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You say the car 'jerks' when you are on the gas...
Your description always groups the symptom with hard accelleration.

Just a thought, have you tried turning off the traction control?

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Old 09-13-2010, 11:52 AM   #15
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I don't think the fuel will cause the jerkyness - at least not for long, since the computer should adjust to the fuel.

As far as fuel mileage, if you only average 26 MPH, you should be thrilled to get 15 mpg. I do all city driving and average around 14 mpg in my LS3. It does go up sharply whenever I do any highway driving, however.
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Old 09-13-2010, 06:53 PM   #16
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Quote:
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You say the car 'jerks' when you are on the gas...
Your description always groups the symptom with hard accelleration.

Just a thought, have you tried turning off the traction control?

SSN8R
Its possible its the traction control, but I kinda doubt it since the acceleration wasn't that hard, and the roads were dry. I'm not sure if it matters, but it has jerked the hardest while turning and accelerating.
I had a 2006 Eclipse GT Modded that had traction control, that I flew in and it never gave me problems like that.

I'm fine with 15mpg if thats just how it is, I was just under the impression that it was poor.
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Old 09-14-2010, 08:21 AM   #17
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Try pushing the button twice and see what you get.

All you have to do is break the tires loose to trigger the TC. The harder you hit her with the whip the more the TC will fight you.

I used to refer to it as reverse whiplash.
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