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Crankshaft sensor or NSBU switch

Paulie G

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Paulie G Enthusiast

Paulie G

Posted
Posted

Looking for some help here, I've done so much reading that my eyes won't focusicon1.png anymore. It seems I have symptoms of both sensor and switch going bad. Anyway here are the details.



Truckicon1.png: 2001 Chevy 2500 8.1L



Few days back I go to start the truck after the weekend. It turns over but doesn't start. I changed the fuel pump
with a delco about a year ago so I turn the key to run and don't hear
the pump. I pop the hood, pull the fuel pup relay, replace it and turn
the key to run and hear the pump come on. Truck starts. This went on
several times and was getting a little old having to pop the hood to
start the truck. I picked up a new relay but didn't put it in yet.
During this period I did notice twice that I had a hard shift while down
shifting coming to a stop but nothing else for a two days. Next day I
take a trip into town, truck started fine, I get two miles down the road
and It quits. got it to a stop and and it started again on the third or
forth flip of the key. Get going again and quits again. This time I
change the relay and it starts right up. This time I'm noticing that the
gear selector Isn't lighting up to show what gear it's in. This is the
first I noticed this but that doesn't mean it didn't happen earlier.
The camshaft, crankshaft, and nsbu have all been replaced before. I
can't figure out which one it is this time.



Will a bad nsbu switch not let powericon1.png go to the relay if it thinks it is in gear when I shut it off?



Will a bad crank sensor make the gear selector act up?



Taking out the relay and replacing it must reset something right?



I looked for bad wires and grounds and fuses but didn't find any



I tried to figure this out on my own without throwing parts at it but now I'm turning to the expertsicon1.png.



Paulie G

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

scan it ,,follow diag tree for the codes ,,,you dont guess dude..

 

you need to buy service info ,either online or paper

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