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  #1  
Old 02-16-2011, 08:36 PM
notverysmart notverysmart is offline
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Default installed new comp. still won't start??

hello all, purchased this truck with a bad rear end, so i put a junkyard unit in and it started and drove. i parked it for 2 months (to aviod paying excesive dmv fees) went out to start it.....no start. charged the battery....no start. installed new (rebuilt) computer and then it would start but die within 2-3 seconds. replaced crank sensor...same thing, starts but wont stay running. put a test light to 1 of the fuel injectors, light flashes during cranking but i lose feul injector power when key is not in the cranking postion. any ideas????
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Old 02-16-2011, 09:02 PM
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You have to program the new PCM and enter the VIN or it won't stay running.
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Old 02-16-2011, 09:31 PM
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it was supposed to be done by the rebuilder, in fact they put stickers all over it saying thats already been programed with vin info and that any attempt to program will viod warranty. is there a way for me to test it without voiding the warranty?
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Old 02-16-2011, 10:04 PM
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If it's been programmed then you just need to keep the truck running until the new PCM can learn the idle strategy and it runs on its own.
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Old 02-16-2011, 10:56 PM
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what would be the best way to keep it going(giving it fuel) safely? how long should it take to learn to run again?
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Old 02-16-2011, 11:02 PM
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Just keep your foot on the gas. It usually takes several minutes.
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Old 02-16-2011, 11:14 PM
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it wont stay running unless i spray fuel into the intake, throttle has no effect.
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Old 02-17-2011, 07:43 AM
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Check the fuel pressure and volume.
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Old 02-22-2011, 05:30 PM
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had a freind come by and check fuel press. & volume...he said its good, when the fuel pump runs..... fuel pump and injectors are only operating when key is in the crank position, once it starts and you release key to run position fuel pump and fuel injectors stop working (put test light on fuel injector and light stops flashing as soon as you stop cranking and put key in "run". new..."rebuilt computer,new crank pos. sensor, and new cam pos. sensor installed.
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