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P0171 system too lean bank 1

debo's Avatar
CF Beginner

Join Date: Mar 2012
Posts: 1

March 31st, 2012, 9:00 PM   #1  
P0171 system too lean bank 1

I got this truck like a month ago. After I got it the evap code was on I took it in to the shop it was replaced but it wasn't plugged in so they hooked it up for me its still got a hard start. It takes 3 turns to get it to fire. I've replaced the fuel pressure regulator and plugs and wires and nothin. So now I got p0171 system too lean bank 1. I've clean the maf sensor and 3I days later it came back on

Anyone have this problem?

nkh34's Avatar
CF Active Member

Join Date: Nov 2011
Posts: 177

April 1st, 2012, 9:19 AM   #2  
it might need a new sensor also you want to really look at the manifold if its cracked anywhere it will throw this code all day if its not really effecting anything you might also look at the 02 sensor it could just be going out

in2pro's Avatar

Join Date: Apr 2008
Posts: 7,378
Austin, Texas

April 1st, 2012, 9:29 AM   #3  
debo Welcome to the forum...

What year and engine do you have?
It might be worth checking the fuel pressure as well.... and as nkh34 suggested check for any vacuum leaks...

99 tahoe 5.7 vortec's Avatar
CF Beginner

Join Date: Jan 2015
Posts: 1

January 6th, 2015, 11:00 PM   #4  
Need help have a p0171 code comes on only at night I clear the code and drive all day and Nothing it only comes on at night checked intake for leaks mass air clean new plugs wires cap rotor. What else can I do to make it go off

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