im going to be getting my hands on a fuel pressure tester to help diagnose the hard cold start on my GS, but i need to know what i am looking for when testing some different things.... on the list of possible culprits are Fuel pressure regulator, leaking injector (though i dont seem to have a misfire condition after changing plugs/wires, but further test driving required to verify) or weak fuel pump check valve. I am assuming that testing the fuel pump check valve is relatively easy, involving having the gauge hooked up to measure weather or not the pressure drop is within the specified range after sitting for x number of hours. what's the range this should be? if that checks out, what do i need to watch for/how do i test the other items?
