Hard to start...need help

[soan]

HARD TO START FOR FEW SECOND !!

FAULT CODE - P1023, Fuel high pressure too low during starting.

- P1026, Fuel high pressure implausible

need to check which part, izit fuel pump problem? or......

[Loren]

Exact model and year of your car please?

[soan]

Exact model and year of your car please?

-Cayman S 987

-2008year

[Loren]

The fuel pressure regulator does not have a connection for the intake pipe pressure and is integrated into the fuel tank installation unit. Its nominal pressure is set at 55 psi ± 1.5 (3.8 ± 0.1 bar) for a flow rate of 21 gph (80 l/h). When running at idle speed, pressure is increased by approx. 1.5 psi (0.1 bar) due to the low fuel requirement of the engine. A holding pressure of > 29 psi (2 bar) should still apply one hour after switching off the engine.

Item 3

[soan]

The fuel pressure regulator does not have a connection for the intake pipe pressure and is integrated into the fuel tank installation unit. Its nominal pressure is set at 55 psi ± 1.5 (3.8 ± 0.1 bar) for a flow rate of 21 gph (80 l/h). When running at idle speed, pressure is increased by approx. 1.5 psi (0.1 bar) due to the low fuel requirement of the engine. A holding pressure of > 29 psi (2 bar) should still apply one hour after switching off the engine.

Item 3

i had change the fuel pump and regulator but problem still existed. how bout high pressure pump?

Edited July 21, 2011 by soan

[Loren]

Very odd occurrence. Have you actually measured the fuel pressure to see if it is indeed high?

[JFP in PA]

Seems strange that it would say the pressure is both low and implausible (does not understand the input signal). First step would be a fuel pressure test to find out where the pressure really is; if it meets specs, clear the codes and see if they come back. If the pressure really is low, further investigation will be required, possible pump replacement.