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2001 Chevy Blazer 4 cyl Four Wheel Drive Automatic 54000 miles

I bought my blazer early this year, used. Within the last month I have been having problems with it starting. It started with just occasionally not starting right away, I had to turn the key two th=o three times. Now, it has taken 20 minutes or more for it to start. It was exactly a week within episodes. When you turn the key everything works fine and I believe I hear the fuel pump. We have changed the relay swich and are wondering if we should change the ignition switch. I've heard of other blazer owners having this same problem. Help

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Tuesday, December 18th, 2007 AT 5:39 PM

1 Reply


This sounds like a passlock security system problem. First, make sure your battery is fully charged and that your alternator is properly maintaining the batterys' charge. If you start the engine and turn on the lights -- at night-- notice how bright they are. Then shut the engine off. If the lights go a little dimmer then your alternator is probably charging the battery properly. This is important-- why, you may ask? Well, if your battery is low it can cause the passlock system to act up and eventualy fail. The passlock system is a factory security system that works as follows: When you turn the key, your ignition switch activates the fuel pump and the passlock system. When the engine is cranked there is a specific resistance that is sent back to your passlock module. This resistance is matched to the resistance in a resistor located inside the passlock module. If this resistance is matched, the fuel pump is allowed to continue to deliver fuel to the engine. If not, your engine will start. If the battery is low, it can damage the resistor inside of your passlock module, rendering it somewhat useless. The passlock module resistor is sometimes inside of the ignition switch or in the module itself. If you are not a mechanic you should take the blazer to a dealer or to someone who understands the PASSLOCK system on your Blazer.

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Tuesday, December 18th, 2007 AT 9:17 PM

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