Engine Knocks...just Changed Oil - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 11 (permalink) Old 01-04-2012, 11:20 PM Thread Starter
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Engine Knocks...just Changed Oil

Ok, so I just got my 07' cobalt out of the shop after getting a new throttle body replaced. I've been having a world of issues with this car ( as you can read my previous post). So the idle issue and check engine light is still on. But the day after I get it out of the shop with getting the new TB, my oil light comes on n off. After awhile of driving it, it stays on. I check the oil ( which I just had changed a couple hundred miles ago) and its full. My engine is knocking so bad and sounds like there is no oil in it? Would could be my new problem? Oil pump or did the idiots at the shop unplug or did something? Because I had to refill my radiator also because they drained n never refilled it after replacing the TB.
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post #2 of 11 (permalink) Old 01-06-2012, 04:33 AM
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What does draining the radiator have to do with replacing a throttle body? How long did you run it with no coolant?

Something does seem right here? More details please
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post #3 of 11 (permalink) Old 01-06-2012, 05:16 AM
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OOO sounds like you need a New Shop!
And maybe a repair manual, so you can do your homework, before tking it to a repair shop. It helps if you know a little bit about a vehicle, then the shop is not so quick, to stick it to ya!
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post #4 of 11 (permalink) Old 01-06-2012, 05:25 AM
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How much coolant did you have to add? Did it overheat?

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post #5 of 11 (permalink) Old 01-06-2012, 06:17 AM
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No reason for them to drain coolant to replace throttle body. My guess would be you have a bad head gasket. Coolant drained into oil and engine is now fubarred.
Definitely stop diriving it and get it into a shop.
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post #6 of 11 (permalink) Old 01-06-2012, 06:29 AM
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Might be to late if engine knocks.

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post #7 of 11 (permalink) Old 01-06-2012, 03:20 PM
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When you checked the oil did it look milky?
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post #8 of 11 (permalink) Old 01-07-2012, 10:33 AM
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If your servicing mechanic was one of our GM dealerships, I am available to follow up with them, if you like. Please let me know!

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post #9 of 11 (permalink) Old 01-11-2012, 07:01 PM
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Engine knock is bad. Most likely a bad bearing (SPUN) on the crankshaft which can happen for several reasons but especially if it ran with no oil or you didn't change the oil over a year and a half (Just kept adding oil as an example) . You get sludge build up, then one of the oil passages gets blocked and the crankshaft or connection rod over heats and spins a bearing.

Now for the news, GM will know when they open up the oil pan if it was due to non oil change or maintenence! Clean inside shows changed oil but if its dark brown or cooked, it shows neglect. You will have to show oil changes (Receipts) by a certified shop, and even then, good luck.

The good news, if the spun bearing is a connecting rod bearing, they can pull the crankshaft, resurface it and put an over sized bearing and replace the connecting rod.

The BAD news, if its a crankshaft journal bearing, well eh, the bearing spinning messes up the engine blocks bearing mating surface on the block and the block must be pulled and probably replaced, new engine.

Happened to one of our work trucks when the guy who had it neglected to change the oil regularly.

The more you drive it the worse it will get and the louder the knock till it gives. I wouldn't start it until you verify if you have oil pressure but by now its probably too late.
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post #10 of 11 (permalink) Old 01-12-2012, 10:42 AM
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I dunno guys, this dude seems to have up and vanished like a fart in the wind, no response since the original post.
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