P1421 hard to start, helps to key on, let pump run then starts easy

Question

Found the car hard to start after sitting over the holiday.  Had plenty of starting power but seemed to lack fuel.  The service light came on intermittently.  I found when I key on and allow the pump to run, then start it it starts easy.  Fuel pressure regulator is suspected?

Answer 1

P1421 Cold start control

If you set a P1421 check the coolant temperature using a scan tool ,it should be at the specific outside temperature. The coolant temperature  sensor not being correct will cause a P1421 , as well as a plugged airfilter, if these area are good check the fuel pump area. As for a fuel pressure regulator that can cause the hard start but you would set a lean code condition. Since the fuel pump is under the rear seat check the fuel pump for any external leak or smell

 The fuel pump has a tendency to crack from fatique check for any leaks