1997 buick park avenue ultra code p0171.

Question

Hi

I have Buick Park Avenue Ultra 3.8L superchanrger. I got two times suggestions one for any vaccum leaks and the other for any other area leaks or cracks. Recently I cleared the code and drive for about 45 minutes to one hour, after worm up engine started hestating and looks like it will stall and no power. So I stoped and shut the engine off waited for one minute started the engine "CEL" came on within 20 seconds, but car was running fine no hesitation, no loss of power I drove like that again for one hour. What could be the P0171 means at thins time. Can someone give some heads up. Thanks in advance

Answer 1

P0171 fuel system lean bank 1,

MAF (mass air flow can code just one side of the bank, when it acts up again tap on it,see if there is any improvement. EGR can do this too, These are just the basic,but what get me is you warmed up the engine,it started to hesitate, close to stalling, and no power on a supercharger, A MAP sensor will do this it does not have to code up a P0108,  Fuel pressure also should be tested, 48 - 55 psi at idle.