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post #1 of 5 (permalink) Old 06-25-2016, 07:56 PM Thread Starter
Join Date: Jun 2016
Location: Living on the east coast, Cape Breton as you may have guessed.
Posts: 20
New Member.

Hey everybody,just a quick note to introduce myself. Glad to have made the decision to join up. I have an 08 coup LS,for almost 7 years. I'll be checking in daily looking for new posts about torque converter lock up issues. Peace.

Last edited by capercobalt88; 06-25-2016 at 07:57 PM. Reason: proper grammer
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post #2 of 5 (permalink) Old 06-27-2016, 06:50 AM
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Join Date: May 2015
Location: Oklahoma
Posts: 945
Welcome to the forums! We'll definitely try our best to help you work through any issues.
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Originally Posted by Plain Jane View Post
Believe me, these cars have a habit of growing on their owners. Your feelings will only strengthen over time...
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post #3 of 5 (permalink) Old 06-27-2016, 11:10 AM
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Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Actually late 2007 and early 2008 software had a glitch. GM tried to reflash the TCM with new software when they realized there was a second issue. Some late 07 early 08 had transmission cooling line issues where transmission oil would seep out and be barely noticeable because none of it would ever leak in your driveway. So before you run to the dealer for a software update to clear this problem make sure your transmission oil level is correct because if you are low this affects torque converter lock up. If you don't have enough oil, oil pressure suffers, if you don't have sufficient oil pressure the torque converter will lock and as soon as engine RPM drop will lose pressure and converter will unlock. Then when engine revs up, pressure rebuilds and torque converter will lock again. Then the cycle repeats itself over and over. Real pain in the tuckess.

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post #4 of 5 (permalink) Old 06-28-2016, 07:20 AM Thread Starter
Join Date: Jun 2016
Location: Living on the east coast, Cape Breton as you may have guessed.
Posts: 20
You bring new information to light, and I do appreciate your time. When I had the tranny shop test scan the issue, I drove so I could duplicate this bouncing tach. The tech who did the actual scan after feeling this RPM surging, did a transmission fluid and filter change, a knew air filter, checked the MAF sensor, and test scanned the car while in the garage beforehand which yielded no codes. The problem in my particular is the TC locks and unlocks. I do have access to an update that may, or may not resolve the issue. The stumbling block for me is whether anyone here on the site knows anymore about it than I am aware of. Possible side effects of updates going wrong (doing more harm than good).
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post #5 of 5 (permalink) Old 06-28-2016, 07:37 AM

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Join Date: Dec 2014
Location: Monessen, pa
Posts: 266
the automotive is strong with this one,

The Land Shark is coming for you!

Originally Posted by Coby7 View Post
His iron was too hot and to big.
Bone stock 2006 Cobalt LS Laser Blue
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