That is because of the vehicle theft deterrent system ! Do you have a security light lit on the instrument cluster ?
The Passlock?"¢ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock?"¢ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock?"¢ System are as follows:
?€¢
The ignition lock cylinder and key
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The ignition lock cylinder case, including the Passlock?"¢ sensor
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The ignition switch
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The body control module (BCM)
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The security indicator on the instrument cluster
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The powertrain control module (PCM)
SOURCE: 2001 cavalier barely starts,sometimes runs
Three things.
First, you need to check the MAF sensor for contamination.
Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.
Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.
SOURCE: 2007 Trailblazer starting problem
you should take it to your local garage or dealer and have them hook it on a computer that would be cheaper in the long run for you because from what you are describeing it could be a list of things.
SOURCE: 2006 Trailblazer won't start
I have had a similar problem with my 06 Trailblazer SS. Took it to the dealer and apparently this is a common occurrence. They replaced my key cylinder and explained that this was because the cylinder was intermittently not completing the start circuit. It seemed to work after that. Now in the dead of winter I am having more starting issues with the vehicle.
SOURCE: 2006 chevy trailblazer will not start/turn over,
Sounds like the starter is the culprit,when the brushes in it are almost gone they will work intermittently and if the brushes aren't touching then you won't even get a click because of the lack of ground for the pull in portion of the starter solenoid winds.The next time it won't start,give the starter a tap or two to confirm this.It should start if i'm right.The starter is under the passengers side just to the rear of the front tire,bolted to the bell housing.
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