4.3l 1500 won’t start has fuel compression and spark

[Kacey Charland]

Hey guys my truck stopped like the power was cut and threw my crank shaft position sensor code. 

 

Replaced sensor and  conector and and it’s all good checked the connection but truck still won’t start (run)will crank and fuel will pump but will misfire if starts and now won’t even start just cranks  

 

got it it to run before but didn’t make it up the road before it went down a couple cylinders and then cut out.

 

no codes are being thrown and my check engine light is now off 

 

any ideas on what to do?? 

[Area51]

What year, and motor?

 

Edit: it was late, and I didn't read the biggest part of the headline.

 

Check the white/black wire at the ignition coil first. On the 4.3's, this is a c9mmon issue, and may not look broken, but the wire inside starts to fray causing several issues, including no start, stalling, etc.

[sefiroxx]

You need to perform a crank sensor variation relearn. You'll need a tech-2 or equiv

[Area51]

They'll run without a sensor relearn, but you'll get a check engine light, and replacing the sensor won't cause the truck to need a relearn. Definitely need the codes though, assuming it's throwing any.