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I would not guess at it, you caould spend a lot of time and money on parts that do not fix it. Is your check engine light on? If so, what code is stored?
If I were to guess, I would say ignition wires or spark plugs. very common problem.
Leaks can be difficult to diagnose. As you can tell there is a lot of "stuff" that can get in the way of making a correct diagnosis. What can be removed to try to find the leak? I would try not to remove anything, it may disturb the leak source. The engine cover may be in the way, and if so definitely should get it out of the way. I would clean the area real well, and try to see from above and below what could be the source. Are you sure it is a power steering fluid leak and not engine oil? Dale
You will need to get the vehicle up, so you can safely get under it while it runs. I would then clean up the area and run the engine to see where the oil is coming from. If it is a large leak, it may be obvious where is is coming from. Dale
You will want to access those rear spark plugs from under the vehicle, it will make it easier. The rear spark plug wires tend to be stuck on the spark plugs, because of heat. So be careful you do not pull the wires apart. Dale
Some questions. Why are you draining, will it need to be cleaned out afterward? Safety is a priority. Removing the tank with fuel in it is dangerous, so the majority of the fuel will need to be siphoned out prior to removal. You will not be able to get all the fuel out without removing the tank.
To change the rubber boot that keeps the dust/ dirt from the piston seal. You will need to rebuild the caliper. You will need to remove the caliper piston.
yes it will be exposed on your particular car.
I agree with cottman. For further help we will need information, what does it sound like when it will not start? what engine is in your cobalt, there are 3 different engine possibilities, also auto or manual trans.
I have more questions than answers. What engine is in your car? There are several different options (5). Does the engine actually run bad, or is it just noisy? But, based on the information given. I would guess there is an exhaust leak or a spark plug that is allowing exhaust gasses past it. I would find out what code is stored in your car's computer, that may help you diagnose what has happend. BTW it was real smart of you to have the car towed rather than driving and possibly doing further damage. Dale fairwayautorepair.com