1997 Buick Park Avenue Ultra 3.8L SC P0171

Question

Hi Reynaldo

I have same code 'P0171' no matter what I replaced . Now there is one question, if intake manifold gasket can leak inside (not outer openings) section of the gasket.

Thanks

Answer 1

You have a fuel problem, You are a supercharger,when you boost you need alot of fuel, and one of the popular failure is the fuel pump control module, Under normal operating condition,your fuel pump speed is from the PCM by a duty cycle, When you boost  the PCM increase fuel pump speed by the fuel pump control unit.  If this fuel pump control unit fails you have extended cranking times ,or not even start. you will also stall out under boost condition, The fuel pump control unit is a popular failure, This unit is located on the left or right side trim panel in the trunk, I realy doubt you have a vacuum leak,. Your car stalled out , it hesitated, and no there is nothing wrong with the intake, you would have rough idle and a misfire code.What ever you need I will send. By the way the fuel pump control unit is called speed control module