Question about 2006 Chevrolet Cobalt

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Check engine light is on

My engine check light came on when I was leaving work. Stopped at Auto Zone and had the guy do a test he put the tester on then asked about my gas cap but it is a screw on then he said that it's a leak somewhere.

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Was your gas cap tight? sounds like you had an evap leak code. If you got gas with car running it can set this code or if you left cap loose

Posted on Aug 27, 2008

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Sometimes will not start


You can buy a spark tester at Auto Zone for little money. Put it in between the spark plug and the plug wire. Then have someone turn the engine over and watch to see of there is a spark in the tester. You can do this test for every plug.
If none of the plugs spark, then the problem is no spark and it could be coils or other. Rent a code checker, Auto Zone rents it for free, you only have to leave the cost for a deposit, but get it back when you return it. This should tell you the possible problems.
If some plugs spark and some don't, the plugs may need to be replaced. They should be replaced every 100,000 miles.

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erase code again , then disconnect battery for a few minutes, reconnect, see if code comes back. hopefully this resets computer. you don\'t have a reset button on steering wheel do you ? replace your fuel filter, if you haven\'t lately. maybe that will help.

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If you electrical system is OK, You will have to pinpoint what the engine is missing...
- Spark
- Fuel
- Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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1 Answer

Went through some water van died after sitting a day it started up but engine light is now on and sputters when stopped went to auto zone they say i have a 2 cylinder misfire what excactly does this mean...


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You should not drive it with a misfire as you could ruin the catalytic converter which is very expensive to replace.

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1 Answer

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