Hard starting when cold

Good morning,

You stated multiport fuel injected. There is no choke on a fuel injection system.

Can you post a picture of the throttle body or carburetor you have?

Cold start extended crank could be from fuel pump loosing its prime over night which means it could be a bad injector leaking or the check valve in the pump.

Can you test the fuel pressure when cold to see if there is any pressure in the system

Fuel Pressure* .................... 331 ± 14 kPa (48 ± 2 psi)

Ignition key ON, engine OFF. Using DRB scan tool, access ASD Fuel System Test. The ASD Fuel System Test will activate the fuel pump and pressurize the system.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I attached a picture of the regulator for you as well.

The fuel pressure regulator is mounted to the fuel rail assembly at the opposite end from the fuel inlet line. The intake plenum must be removed to access the fuel pressure regulator.

Roy

Warning: The fuel system is under constant pressure, even when the engine is OFF. Always release fuel pressure before servicing any fuel system component.

Removal

1. Release fuel system pressure.
2. Remove the fuel rail.
3. Remove 2 attaching bolts and remove fuel pressure regulator from fuel rail. Inspect O-ring for damage or wear and replace if necessary.
4. Loosen and remove fuel return hose.

Installation

1. Lube fuel pressure O-ring with clean engine oil prior to installation. Press regulator into fuel rail, attach 2 mounting bolts and torque to 8.7 Nm (77 lb-in).
2. Install fuel return hose and torque to 1 Nm (10 lb-in).

Note: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is turned to the OFF position.

5. Using scan tool, place ignition switch in "run" position and use Actuate Output Test Auto Shutdown (ASD) Relay", to activate fuel pump and pressurize system.
6. Check for leaks.

You can rent a tester at a parts store.

Get back to us when you can

Roy

Let me know the results of the fuel pressure test.

Roy

You are welcome.

Always glad to help.

Roy

Okay, controller? Do you mean the relay? The ECM is what controls the fuel pump relay based on the input from the ignition system.

I attached the wiring diagram for you as well as the location of the fuel pump relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-check-wiring

Roy

FUEL PUMP MODULE REMOVAL:

WARNING: The fuel system is under constant pressure, even when the engine is OFF. Always release fuel pressure before servicing any fuel system component.

Fuel Hose Fitting On Fuel Pump Module
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1. Release fuel pressure.
2. Drain fuel tank.
3. Remove fuel tank.
4. While holding the fuel pump module down, remove the locknut, (locknut is threaded onto tank). Use a brass drift to loosen the fuel pump locknut. After the locknut has been removed release the fuel pump module and it will spring up from the fuel tank.
5. Remove the fuel pump module from the fuel tank.

DISASSEMBLY
Fuel Gauge Sending Unit And In-Tank Filter
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FUEL GAUGE SENDING UNIT REMOVAL
1. Remove sending unit attaching screws from mounting bracket located on the side of the fuel pump reservoir.
2. Disconnect electrical connections from sending unit, and remove sending unit.

IN-TANK FUEL FILTER REMOVAL
1. Pry back the fuel filter mounting tabs and pull the fuel filter off of the fuel pump module.

NOTE: The fuel pump is not serviceable, if the pump is defective replace the whole fuel pump module.

ASSEMBLY
Fuel Gauge Sending Unit And In-Tank Filter
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FUEL GAUGE SENDING UNIT INSTALLATION

1. Connect the electrical connections to the sending unit.
2. Install sending unit onto the fuel reservoir, and tighten the mounting screws.

IN-TANK FUEL FILTER INSTALLATION

1. Snap the fuel filter onto the mounting tabs of the fuel reservoir.

FUEL PUMP MODULE INSTALLATION

NOTE: Locknut and gasket must be replaced whenever the fuel pump module is serviced.

1. Wipe seal area of tank clean, and install a new seal on pump.
2. Install locknut over top of fuel pump module.
3. Push fuel pump module into the tank and hold with one hand while tightening the locknut with the other hand.
4. Install fuel tank assembly.
NOTE: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is turned to the OFF position.
5. Using scan tool, place ignition switch in "RUN" position and use Actuate Output Test Auto Shutdown (ASD) Relay", to activate fuel pump and pressurize system.
6. Check for leaks.

Can you send me a picture of the part?

There is a fuel pressure regulator but that just limits the pressure to the manufacturers specs.

Roy

The fuel pressure regulator is a mechanical device not controlled by the Engine Controller. The regulator is a vacuum balanced nonadjustable type mounted on the output end of the fuel rail, and connected to intake manifold vacuum. The fuel return tube is mounted to the pressure regulator. The regulator is calibrated to maintain fuel pressure at 214 kPa (31 psi), with vacuum applied at idle. With vacuum disconnected the fuel pressure will run 55-69 kPa (8-10 psi) higher. The regulator contains a diaphragm, calibrated spring, and a fuel return valve. Fuel pressure operates on one side of the regulator, while spring pressure and intake manifold vacuum operate on the other side. Spring pressure on one side of the diaphragm tries to force the return valve closed. Fuel pressure on the other side of the diaphragm, with assistance from manifold vacuum on the spring side of the diaphragm, act against spring pressure to open the return valve. System fuel pressure is the amount of fuel pressure required to force against spring pressure and unseat the return valve.

According to the picture, it is on the driver's side at the back of the rail.

Double-check again to confirm.

Roy

I attached the procedure for replacing it.

There is a snap ring holding it in. I attached a picture for you.

Roy

REMOVAL

1. Release fuel system pressure.
2. Disconnect negative battery cable, and remove air cleaner assembly.
3. Disconnect vacuum hose from throttle body.
Fuel Pressure Regulator Removal
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4. Using snap ring pliers, remove snap ring and pressure regulator.
5. Remove O-rings from regulator.

INSTALLATION

1. Install new O-rings on regulator.
2. Push regulator into fuel rail, with vacuum nipple pointed straight up.
3. Install snap ring.
4. Connect vacuum hose to regulator.
5. Connect negative battery cable, start engine and check for leaks.
6. Install air cleaner assembly.

Let us see what happens when you change it. Based on your input, it needs to be replaced.

Roy

Okay, you will need to go to the fuel pump and check for voltage to the pump to see if the ECM is commanding it on.

Roy