Question about 2007 Chevrolet Cobalt Coupe
I have a 5 speed chevy cobalt 2006 that has given me hell. First off about two years ago my check engine light came on and it was a EVAP code PO449 at the time Colorado didn't require emissions (now they do) My car had another recall that i got fixed in about hour at the dealership. Then as i drove it quickly noticed it had problems starting. Fixed the tad issue with air in my fuel tank. Now i am screwed my fuel pump relay wasn;t connecting so go that fixed but now it wont crank. Before this it would try to crank but wouldn't get any gas because the fuel pump relay wasn't turning th fuel pump on. I am lost at this point i checked my alternator all the lights come on and i charged the battery twice today and i have no crank. God i hate this car.. Please help
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Posted on Jan 02, 2017
You need to get the computer scanned. This can be done at Auto Zone or similar parts stores free of charge. More than likely you will just need new spark plugs and/or plug wires but I cannot be certain without the engine code.
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Posted on Feb 13, 2009
SOURCE: cobalt engine misfires
I can think of a couple of possible things to check.
When is the last time you put in new spark plugs? Ever? Check them. The problem may simply be worn out spark plugs. Likewise, a bad spark plug cable could cause misfires. Yet that is rather unlikely considering your car's low mileage.
Check the connections of all of the rubber vacuum lines which are attached to the top of the engine and which then are attached elsewhere. A vacuum leak due to loose fitting connections can make it hard to start the car. Likewise a vacuum leak can also cause the lean fuel code since the intake manifold no longer generates as strong of a vacuum as it should.
Virtually all cars have a Positive Crankcase Ventilation (PCV) valve located somewhere on the cylinder head cover. The big rubber grommet around the PCV valve is a common cause of vacuum leaks. Check that the PCV valve is making a snug fit inside of this rubber grommet. While you are at it, pull the PCV valve out of the grommet and make sure that it isn't stopped up. A stopped up PCV valve is very unlikely if you have been good about regularly changing your car's oil.
Check that the clamps for the big hose running from the top of the engine to the air filter housing are snug. And, of course, check that the air filter isn't extremely dirty or stopped up with debris.
It is possible that the mass air flow sensor is defective or has gone bad, but I highly doubt this since your car has very low mileage. Besides, a bad mass air flow sensor on any modern car should produce an error code.
A dirty fuel filter or a weak fuel pump could cause starting problems, and might even cause stalling and misfire problems -- especially when driving uphill. Yet I don't think that this is the problem. Just something to keep in mind as a possibility.
It is possible that the ignition module is either defective or has prematurely gone bad. Usually a good sign of the ignition module going bad is an increasing rate of misfires as the engine gets warmed up. Start the car and let it idle and warm up. If the rate of misfires increases as the engine warms up to normal operating temperature, then it is likely that the ignition module is close to completely giving up the ghost.
Finally, make sure that all bolts connecting the intake manifold and air bell atop the intake manifold are tight. Again, the idea is to get rid of vacuum leaks. This is unlikely, but worth checking. These bolts should never be tightened more than the specified torque values.
Well, these are just some common things which should initially be checked. Assuming that the spark plugs and plug wires are good and considering your car's low mileage, I am betting on either a vacuum leak or a failing ignition module. The latter can be tested by a mechanic who uses an oscilloscope to look for missing ignition module pulses.
Posted on Apr 20, 2009
SOURCE: 06 Colorado wont start at times
there is a faulty switch in the steering wheel column. My truck did the same thing. Next time check to see if the security light flashes next time it doesn't start. the time delay is more like 10 min.
Posted on Dec 31, 2009
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