Question about 2000 Cadillac Escalade

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2003 Cadillac Escalade ESV cut off while I was driving. Charged the battery and it turns over, but won't start. After sitting for a few days battery is dead again. Disconnected wire to battery for sub woofer, but battery still died.

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Doesnt sound like the battery is the issue(most parts store can test the battery in house to see if its shot). regardless if it dies while sitting there is a bad ground or drain on the system, youll need to chase it down with a voltmeter to locate the problem there. once thats done you need to determine which element of internal combustion youve lost. fuel, spark, air or compression. most likely its fuel or spark, ive never seen all cylinders loose compression at once unless its a catastrophic failure(engine blows up) and a loss in one cylinder is generally not enough to render the engine inoperable. GMC fuel injection in particular vortec models are extremely finicky about fuel pressure in most case 60lbs is required however i would check a haynes or chilton service manual for the exact number if i were you. you can check fuel pressure by hooking a test gauge to the service port (located inline usually near intake manifold) also you can check to see if the pump or relay has gone faulty by simply turning on the key(dont attempt to start) and having a helper listen to hear the fuel pump turning on (itll make a humming noise for a fuw seconds to build up pressure before starting) if the fuel pump is working, and putting out the correct amount of pressure(remember vortecs are finicky just because its working doesnt mean its getting adequate pressure) the next item to check would be spark. im assuming your vehicle runs off of a series of coil packs. if so you can generally have these tested at most parts stores. if you cant finda vendor to test them simply remove a spark plug, leave it hooked to the wire, grasp it with some insulated pliers and ground it out while the engine is being turned over by a helper. you should be able to visually see a spark being emmitted from the plug at this point. if you have fuel and spark but it still wont start then the issue is most likely in a sensor or ignition module. in this case a check engine light should be on indicating a trouble code is store in the ECM. this can be checked by hooking an obd2 scan tool to the service port which is usually located under the dash on the drivers side of the vehicle. anyways this should get you going in the right direction. ill moniter this post for any feedback. hope this helps and good luck!

Posted on Oct 15, 2013

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