Lincoln C. Cold starting hesatatation

Item Part Number Description 1 9D280 Fuel Injection Supply Manifold 2 9C968 Fuel Pressure Regulator 3 9F593 Fuel Injector 4 9350 Fuel Pump 5 - Vapor Valve 6 9002 Fuel Tank 7 9S278 Rear Fuel Supply Return and Vapor Tube 8 9155 Fuel Filter

Wires on wrong ?

Fuel Pump Failing & not holding pressure
in the fuel rail when it sits?

FUEL PRESSURE IS PROBABLY LOW. REPLACE THE FUEL FILTER IF THE PRESSURE IS BELOW 40 PSI

Have you checked the fuel pressure with a gauge before and after the first attempt to start in the morning ?

Check Fuel Pressure with a gauge

If that pump is 16 years old ,it most likely
has a check valve or volume issue, at the least

Do not overlook spark plugs that are in there over 3 years
& a fuel filter 3 or 4 years old

O2 Sensors while not the issue are only good for 100,000

No such thing on your car.
The temp sensor tells the computer what the engine coolant temp is.
If it were faulty you would get a check engine light.
I would have the fuel pressure checked before and after you crank the engine. The pump relay provides power to the pump when you turn the key on to recover some of the lost fuel pressure after the car sits. The one way valve in the pump is supposed to prevent the pressure from dropping.
If the fuel pressure drops to zero it could take some time to crank the engine enough to get it back up.

I would be considering testing/replacing engine coolant temperature sensor. A faulty sensor can send signal that engine is already warm when it is still cold, thus, less fuel delivery than needed at time of engine being cold.

When the engine is cold cycle the ignition switch without starting the engine this is just to get the fuel pump going look at the injector and fuel line you may have a fuel leak that needs to be resolved

with the key on engine off it should be 32>40 psi and drop to no less than 30 psi and hold... if not your looking at a pump assembly, check your fuel filter or replace it and retest.....hope this helps...GL

you could have a couple differnet issues. cold start misfires, an intake air leak, poor compression with engine cold,or a fuel pressure issue with a leaking injector or fuel pressure is bleeding back due to a faulty pressure regulator. my recommendation is to buy a fuel pressure gauge and monitor pressure overnight. you could also pull the fuel rail and see if an injector is leaking at the same time. you can spray the intake system with a highly volitile liquid(with engine running) to see if idle speed changes to check for an air leak