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Discussion Starter · #1 ·
My 2006 cobalt LT has roughly 167,000 miles on it. A few weeks back I was leaving work and experienced a loss in power when accelerating from stop in 1/2 gears. The RPM's did not jump nor did it sound like there was any slipping, but rather it sounded like the motor was bogging down. After a very short distance I parked the car to avoid causing any damage.

Put the car on the lift, checked fluid level and everything was in good condition. Clean red fluid, no burnt smell. Checked codes and for stored codes, but found nothing. After reading a few forums, i grounded the TCM as one guy did, and the vehicle seemed to run better. A couple days later, same symptoms; loss of power and sounded almost exactly like when someone is riding the release of the clutch on a manual. Stopped the car, put in park, then back to drive and it was ok. Still no codes.

Trying to avoid dropping the tranny, i removed the pan to check for any metal shavings, but found the fluid to be in excellent condition. Changed the fluid and filter anyways. Cleaned off the TCM connector, cleaned throttle body, checked all wiring, and found one ground that was corroded pretty bad and replaced that ground.
Replaced MAF and car seemed to work good for a day or two, and now it has the same sporadic loss of power issue, but now it has issues going from 3rd to 4th. No slipping, but just wont shift. I can let off the throttle or shift to neutral and back to drive and it works fine again.

I cannot seem to figure out what the issue is. Thoughts??
 

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Maybe your cat is partially plugged, this doesn't always throw a code at first but may eventually get a cat inefficiency code. A plugged cat will put your car into limp mode and often won't let the car shift into third or fourth. All you need is one bad tank of gas and you can plug your cat.
 

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Discussion Starter · #3 · (Edited)
I would think that if the CAT was plugged and in Limp mode, the issue would be constant. I recently replace the exhaust, but not the CAT. double checked to make sure I didn't bend the flex on the cat..

Either way, this week the car has had issues shifting from 2 to 3, and 3 to 4. Not sure a plugged CAT would cause that...
Is there a way to check if that is the issue without removing the CAT?
 

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Only if it's completely plugged. Pull one of the HO²s preferably the first one and go in with a camera. Wish I could remember the member from saint john's user name that's on here. He had a plugged cat on his way from Halifax and his car went into limp mode and slowed down to a crawl . Car would not shift higher than second gear.
 

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Discussion Starter · #5 ·
I will look into that... Can you think of what else it may be? I thought may be the TCC solenoid may be going, but haven't had the time to pull the cover on the side to get to it.

Thanks!
 

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That would definitely throw a code. I can't think of anything else that would cause your symptoms as you describe it. Maybe somebody else will chime in!!!
 

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How long have you had the car?
 

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Discussion Starter · #9 ·
My wife bought the car new. Her father is more or less a mechanic who kept the car up very well. I have driven the car since about 80k. I've kept the regular maintenance up, and done all the work ourselves outside of the ignition switch recall.
 

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Okay, that eliminates somebody tampering with the Check Engine Light. Did you check for pending codes or history codes?
 

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Discussion Starter · #11 ·
Yes sir! I have checked multiple times. I was debating on whether or not to take it to a transmission place to see if their equipment could narrow down the issue, but because the issue is intermittent i dont want to waste the money.
 

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I would bet that the transmission is okay, these are actually almost bullet proof. GM had less than 1% failure with these in warranty period which I believe was 60000 miles. Almost half of that was due to abuse, people getting stuck and spinning tires then all of a sudden hitting pavement or other stupid stuff. Most were exit bearings on passenger side and a few failed solenoids leaking cooling lines and such..
 
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