Question about Chevrolet Blazer

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Have an '01 chevy blazer....Vehicle dies occassionally when driving down the road. Recently, had tune up done. Replaced plugs and wiring. Also fixed two loose/bad wiring connections, but it still dies. I replaced alternator because the voltage gauge would fluctuate, but that didnt help either. Not sure what else could be the issue......

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  • Chevrolet Master
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This problem can be alot of things, the first step is to figure out what is happening, for example is it looseing power (batt voltage) or spark or fuel. you will need to get the truck to die out, then check for spark, check at the coil and then at the plugs, you will need to know if its a spark problem, if its loosing spark then take a look at the ignition control module, this is located under distributor cap, remove it and have it tested at an auto parts store, i know that napa auto parts tests them, make sure to have them test it a few times to get it hot. this is for a no spark problem start there, the next test would be for fuel, when the truck dies check the fuel pressure. a fuel gauge will be needed for this test. theres a schrader valve on the fuel line near the intake, hook it there and crank the engine and there should be at least .also if theres no fuel pressure check the wiring to fuelpump module, this is located on the top of the tank, you will see the connectors from the side, driverside, you will need to wiggle the wiring while someone cranks the engine. there are problems with the connector and wiring at the fuelpump plug going bad. and the last thing is to go to an autopart store and have them scan the computer for any stored codes, the computer will store a code if it picks up the problem. for example there may be a code for the crank sensor, then you would check the crank sensor and the connector to it, good luck and good day.

Posted on Mar 27, 2011

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  • Chevrolet Master
  • 373 Answers

Hard to tell what the problem could be, but I a suggestion.
I have one rule when dealing with possible electrical problems.... replace the battery. Modern cars have finicky electrical systems and the slightest voltage variations can be a problem. Make sure you have a good battery first.
I have done this on an '89 Bonneville and an '04 Cad CTS, to solve running/dieing problems.
Yeah, it's $100, but if it's an older battery, it probably needs to get replaced anyway.
Maybe you can swap batteries with someone temporarily?

Posted on Mar 27, 2011

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