Random Bucking when into Gear... - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 6 (permalink) Old 07-16-2013, 10:10 AM Thread Starter
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Random Bucking when into Gear...

Hello forum!

I am not a gearhead but now as I am having issues with my 05 chevy cobalt coupe, I have ben learning here and there with my grandfather and we are having a problem that just will not go away so bear with me and I will report any feedback and communication on this thread to my grandfather in an attempt top get this car road ready again.

Here is the problem:

Car overheated last year resulting in an engine replacement..used engine out of a malibu with 140k miles. They also replaces a variety of misc. hoses and such when they did the install. I got the car back and was fine for a week..ran like it did back in 05. I turn the car on and upon going into first gear, or any other gear for that matter, it began to buck almost as if it were a manual tranny and i was trying to go into fifth gear from a standstill. Turned car off and a few days later when my grandfather arrived it worked fine again. Drove it from Florida (where i was living) all the way up to Pennsylvania with NO problems. Now it is doing it again ..randomly. You can feel it kick a little when startup and thats when i can tell it will do it..and it does,...bucking each gear and losing my power steering. Then 20 mins later it will run fine.

Fixes so far: My grandfather did all the basic steps such as cledaning filters, changing fluids, etc. He also just installed a new transmisssion control module as instructed by autozone..still no relief. One minute its in its prime the next i cant leave the supermarket bc its bucking and needs a breather.

TLDR; Car randomly bucks changing gears , losing p-steering and forced to pull over. Short "breather" and it runs like a charm for hours on end.

Thanks fellas we have ben putting so much time/$$$$ into fixing this and this random issue has us stumped. Appreciate any advice!
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post #2 of 6 (permalink) Old 07-16-2013, 10:40 AM
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You are losing low speed gmlan communication between all modules ( PCM, TCM, BCM ) . This often occurs when the tabs of the ECM/TCM fuse corrode. Try changing the 10 amp fuse. Could be a cheap fix. Top lefthand corner on BCM fuseblock. Never know,try, nothing to lose . Well 75cents fuse.

---------- Post added at 02:40 PM ---------- Previous post was at 02:35 PM ----------

Read through this thread to see if problem is similar.

https://www.yourcobalt.com/forums/pro...al-issues.html

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Last edited by Coby7; 07-16-2013 at 04:16 PM.
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post #3 of 6 (permalink) Old 07-16-2013, 03:59 PM
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similar problem

I have an 05 cobalt sedan base model and its going through the same issues. I got the engine replaced less than a year ago with a new motor around 21k on it. If I drive it very gingerly once a day then its usually fine, unless I accelerate or decelerate too quickly, then it shifts hard and starts to cut out when coming to a stop. Some times if I shut the car off and let it sit a minute before starting again, it'll be ok. But it still has the issue. I replaced the fuel filter and that seemed to fix it for a few days but it was still idling funny. So I took the throttle body off and cleaned it up and now its idling like a dream! Ran like sports car for a little while! Then, shifted hard. And continued to do so until I parked it. Which is were im currently at. My step father suggests a new tps, which means a new throttle body due to the tps being built in and programmed to the Tb. I would like to get some more opinions before making the purchase.
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post #4 of 6 (permalink) Old 07-16-2013, 04:15 PM
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Do you lose steering? If not it just sounds like you're losing comunication between PCM and TCM. I would definitely look at the grounds. You might be losing ground when the engine tilts too much forward or bacwards if you accelerate or decelerate too hard.

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post #5 of 6 (permalink) Old 07-16-2013, 04:48 PM
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Quote:
Originally Posted by Coby7 View Post
Do you lose steering? If not it just sounds like you're losing comunication between PCM and TCM. I would definitely look at the grounds. You might be losing ground when the engine tilts too much forward or bacwards if you accelerate or decelerate too hard.
Not loosing any kind of steering, at work so I'll be able to check those grounds in about 12 hours!
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post #6 of 6 (permalink) Old 08-12-2013, 02:31 PM
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