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

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Thank you for using FixYa, have a nice day.

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