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I have a 2005 cobalt that has had an engine replaced with a used 2008 2.2 ,now has around 45-50k miles (this was done at a garage later known to be dishonest, and cut corners).

I burn a lot of coolant, only noticeable while the engine is cold. From my understanding, a bad intake manifold can cause this. There is a good chance that the garage (that is now closed) used the same gaskets to save them money. Could this cause this? (it did pass a compression test that I did). Antifreeze smell/white smoke is very evident when the engine is cold

Any help/opinions will be greatly appreciated!

From my research, I've found that a head gasket problem is very rare on an ecotec.
 

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would passing a compression test rule out a head gasket, but still leave the intake manifold as a possibility?
 

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I personally would blame the headgasket, although the intake gasket is much cheaper to replace. I'm not sure if coolant runs through the intakes on these cars though
 

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I might be wrong here but I don't think you can install a 2008 engine in a 2005 unless you change all the modules. Pretty sure crank reluctor ring has a different amount of teeth and exhaust cam has a sensor. This said I doubt they put a 2008 engine in your car. 2005 has a PCM and seperate ignition module where the 2008 has it integrated. I think you were lied too.

Intake manifold has no coolant going through it so unfortunately it looks like you might have a bad head gasket. Not such a hard job in the hands of a proper mechanic with the right tools. Compression test just tells you that your head and cylinders are fine it won't show a bad head gasket. Look on thr bright side it's leaking in a cylinder and not in the base yet. This means you caught it in time.
 

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Just did a compression test again with 180 on all cylinders. The 08 engine was picked uP at a junk yard by me
No coolant at all in oil
Very evident smell of coolant/smoke until its warm
 

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So they tore the head off the original motor and put it on the 08? Cause like coby said, most of the sensors and communications are different.

Either way as said above, sounds like a head gasket. Do a leak down test and you will see what cylinders are affected, though it won't matter. You can do it in a day
 

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Even then the 2005 crank reluctor has less teeth than the 2008 so you would also need to change the reluctor on the crank. Or change all the modules. I'm confused, missing too much info.

Unless 2.2l ecotec engine was out of an 08 G5, now that would make sense since the G5 kept the same bottom from 05 to 08.
 

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update: a garage did a coolant pressure test, and it held up all day. What else could it be?
Does the engine run rough for a couple of seconds when you first start it? also I would get the engine to operating temp then let it cool down pull the plugs and see of you can look into the cylinders to see if coolant is leaking into the cylinders it only has to be a drop and you got a bad head gasket

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