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Old 08-10-2010, 01:24 AM   #1
David79z28
 
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Surging/ hesitation

I have a 2010 SS with an A6 trans. I started noticing the car hesitating/ surging when I turned the cruise on at 70 mph. My dealer experienced it also while driving my car. However, they could not figure out what to do to fix it. They felt that the car was between 5th and 6th gears, causing the converter not to fully lock up for a few seconds.

Now the car is doing this at any sustained speed even when the cruise is off. So that theory is shot!!!

Anyone else experience this? If so, what was the fix?

Any techs seen this yet?

I would like to help the dealer find the solution if possible.
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Old 09-22-2010, 06:22 AM   #2
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I have a 2011 2ss that also hesitates and surges at any sustained speed. It also does this with slight acceleration. I also went to the dealer. All they would tell me is that everything is within parameters. It feels like the timing is slightly off.

This can't be normal operation. I find it hard to believe that GM could possibly think this is acceptable. I sure hope someone comes up with some suggestions for a fix.
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Old 09-22-2010, 08:14 AM   #3
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Possible bad gas. Have you tried the 5 and 20 fuse pull in the engine bay. If you are running lower than 91 octane you will have issues. Also the computer will dump to the low octane full table to keep from blowing the engine. Problem is once done there the car does not relearn well.

Run you tank to almost dry. Go get 91 or higher octane gas from a name brand busy station. The do overnight fuse pull and report back to us.
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Old 09-22-2010, 11:01 AM   #4
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could be the engine switching back and forth between 8 cyl to 4 cyl which is normal for L99.
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Old 09-22-2010, 01:00 PM   #5
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could be the engine switching back and forth between 8 cyl to 4 cyl which is normal for L99.

It happens with mine also and I think it is the crappy AFM.
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Old 09-23-2010, 09:38 AM   #6
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fsugreg, you could also take the vehicle to another dealership for a second opinion on this issue as well. I hope the suggestions here help you!

Jeff Morris, Chevrolet Customer Service
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Old 09-23-2010, 01:33 PM   #7
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fsugreg, you could also take the vehicle to another dealership for a second opinion on this issue as well. I hope the suggestions here help you!

Jeff Morris, Chevrolet Customer Service
I just got a call from a Josh at Chevrolet Cust Svc stating again that this is normal. Why should we waste our time with another dealer if Chevy won't do anything?

Last edited by David79z28; 09-24-2010 at 12:49 PM.
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Old 09-24-2010, 09:01 AM   #8
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I always put 93 octane in. Car is at a different dealer now. They feel the hesitation, and first thought is that the fuel on demand (shutting fuel off to four cylinders) is kicking in pre-maturely. They have my car now, and are going to re-evaluate the parameters to try to fix it. I'll let you know.
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Old 09-25-2010, 07:31 PM   #9
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I have a maggie with afm off and still have this same issue with custom tune. I am leaning more toward transmission tune/torque converter!
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Old 09-26-2010, 09:44 PM   #10
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Mine does it too on occasion, but also when shifting down from speed. It's the transmissions, I'm not sure why, but the new auto transmissions are not great. I had the same issues, but worse with Dodge Magnum RT auto. Service doesn't have a clue what to do if the car isn't throwing a code and Chevy won't pay for what they need to do, which is open it up and see what the friggin issue is.
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Old 09-26-2010, 10:15 PM   #11
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Did you check to make sure your maf hasn't gone bad, I over oiled my k&n air filter and the red oil got on the maf and caused it to crap out, giving me similar symptoms.
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Old 09-27-2010, 04:00 PM   #12
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David79z28, could you send your case number so that I can review it? Also when we give our customers the resolution for their case we are given (most times) the resolution from the dealership as per their diagnosis of your vehicle and situation at the time. This is why in some cases we do suggest that you take your vehicle to another dealership to see if the other dealership can offer any insight into the problem with the vehicle and possibly give a different resolution. It doesn't work all the time but many times it has been a determining factor in positive outcomes. I hope that answers your question. I hope to hear from you soon.

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Old 09-27-2010, 04:24 PM   #13
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i have same problem in my l99 , i feel the hesitates in the first monthes but i'm didn't take it in seriously because it was happening to me at low speed and i dedn't changed my exhaust that time , but now i change my exhaust system and usually i drive my car in high way and i'm just feeling the hesitates and with the new exhaust it make high noise during driving and i feel that noise aulso when i puting in cruise control at 140km , i thought this noise comes from the exhaust at the beginning ..

the thing which i'm not know why it's happen , during i'm driving in high speed and the cruise control worked in 140km , i try to change the gear shift to manual and the sound is just desappeared !!


i hated the automatic gear after happen to me this problem specialy with MAGNAFLOW exhaust the sound come huge !!
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Old 09-27-2010, 04:34 PM   #14
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If any of you can pul out your MAF and let me know the ID it has on the blk plastic There is some thing that i learned today And if you post and it is what i think then you need a new MAF.
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Old 09-27-2010, 06:43 PM   #15
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To the OP and others with Auto Trans; Have you tried it in Manual/Sport mode (M+No Paddles)? Your AFM will never kick in and it may help you rule that out.
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Old 09-27-2010, 07:05 PM   #16
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Mine does it even with the afm turned off.
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Old 09-27-2010, 09:10 PM   #17
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If any of you can pul out your MAF and let me know the ID it has on the blk plastic There is some thing that i learned today And if you post and it is what i think then you need a new MAF.
Splain yoself
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Old 09-27-2010, 09:25 PM   #18
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Originally Posted by Chevrolet Customer Svc View Post
David79z28, could you send your case number so that I can review it? Also when we give our customers the resolution for their case we are given (most times) the resolution from the dealership as per their diagnosis of your vehicle and situation at the time. This is why in some cases we do suggest that you take your vehicle to another dealership to see if the other dealership can offer any insight into the problem with the vehicle and possibly give a different resolution. It doesn't work all the time but many times it has been a determining factor in positive outcomes. I hope that answers your question. I hope to hear from you soon.

Jeff Morris, Chevrolet Customer Service
Thanks, I'll get that from Josh the next time he calls.

THANKS AGAIN!!
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Old 10-03-2010, 12:32 PM   #19
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Got my car back. No changes were made and was told again that this was normal. This can't be the case. GM had got to come up with a fix.

2ssRS. The numbers on my maf located just under the clip are,
"AFH70M-43A" on one side and "15865761" on the other. I didn't take it out to see if there were any on the inside.

Customer Svc. It almost feels like the timing is off slightly. Mine slowly gets better to the point where it runs fantastic. Then about a week after it seems to fix itself, I'll get a loud "gurgle" (for lack of a better term) out of the muffler on a cold start in the morning. That's when the hesitation and surging starts all over again. I only have 3k miles now, and a lifter has started tapping on all cold starts.
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Old 11-28-2010, 07:57 AM   #20
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Thumbs down HESITATION

My 2010 ss automatic is hesitating also. Dealer says they can not find any problem. It has 1200 miles on it ,and i get mad every time i drive it. HELP.Davi79z28 did Jeff Morris info heip you out?

Last edited by Ricker 54; 11-28-2010 at 08:06 AM. Reason: additional info
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Old 11-28-2010, 09:03 AM   #21
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My 2010 ss automatic is hesitating also. Dealer says they can not find any problem. It has 1200 miles on it ,and i get mad every time i drive it. HELP.Davi79z28 did Jeff Morris info heip you out?

No, he just told me that my issue was open. We don't drive it much and it didn't hesitate the past couple of times we drove it.

The dealer and Gm stopped following up with me...

It has 2200 miles on it now. I hope it worked itself out...
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Old 11-28-2010, 12:38 PM   #22
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GM has not been up front with the whole AFM issue. If I was told that when AFM enables and disables, I would some times feel hesitation, surging and exhaust noise and that would allow me to save 1 mile per gal (or ever how much) then I could have made a more informed decision as to weather I wanted to have a car with that system. I talked to salesman at 2 dealers about AFM and both said u would not notice the operation. Its been used on PUs for years. I was blind sided by this.

Because of this crap we loose 25HP, have a more complicated system and have to put up with hesitation, surging and exhaust noise. And to add to the insult we have to pay a 1185 premium.

Last edited by cmore; 11-28-2010 at 08:03 PM.
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Old 11-28-2010, 07:00 PM   #23
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Just put about 100 miles on mine and the hesitation is gone. Somehow it corrected itself.

BTW: I have a 2010 Silverado with AFM and it NEVER hesitates...
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Old 11-28-2010, 08:33 PM   #24
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Junk SS

David79z28 thanks for reply. Planning on stopping at dealership this week. They were supposed to follow up with GM. LOL............. If you would like to exchange phone numbers let me know. Rick
I will check back Monday.
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Old 02-19-2011, 08:40 PM   #25
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Did anyone get a resolution on this? I just drove home a new SS RS (put miles 31-76 on it) and noticed the surge during cruise was pretty bad. Almost like someone is slightly tapping on the breaks just slightly every few seconds.
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