No power to fuel injectors - 1999 Ford F250 Regular Cab

If you have a 1985 Cadillac Seville with a 4.1-liter engine and are experiencing an issue where one injector is losing power after the car warms up, and a second injector follows, there can be several potential causes for this problem. This issue may result in poor engine performance. Here are some common reasons why this could happen:

1. Injector Clogging: Over time, fuel injectors can become clogged with dirt, debris, or deposits from low-quality fuel. If the first injector is losing power due to clogging, the second injector may eventually follow suit.
2. Fuel Pressure Issues: If the fuel pressure in the fuel system is not consistent or within the specified range, it can affect the performance of the injectors. A drop in fuel pressure can lead to a loss of power in individual injectors.
3. Electrical Issues: Problems with the electrical connections to the injectors, such as loose or corroded connectors, damaged wires, or faulty sensors, can disrupt the power supply to the injectors.
4. ECU (Engine Control Unit) Issues: The ECU controls the injectors' operation, and a malfunctioning ECU can lead to problems with injector operation.
5. Temperature-Related Issues: The fact that the issue occurs after the engine warms up suggests a temperature-related problem. It's possible that there's a heat-related issue affecting the injectors or their electrical connections. This could be related to poor wiring insulation, which may degrade when hot.
6. Vacuum Leaks: Vacuum leaks in the intake manifold can disrupt the air-fuel mixture and affect injector performance. These leaks may become more pronounced as the engine warms up.
7. Fuel Quality: Ensure that you are using good-quality fuel, as poor-quality or contaminated fuel can lead to injector issues.
8. Throttle Position Sensor (TPS) Issues: Problems with the TPS can affect the air-fuel mixture and injector performance.

To diagnose and resolve this issue, you may need to perform a series of tests and inspections, including checking for fuel pressure, inspecting the injectors, testing the electrical connections and wiring, and examining the ECU for error codes. It may be beneficial to consult with a qualified mechanic or technician who can perform a thorough diagnostic and identify the root cause of the problem. They can use tools and diagnostic equipment to pinpoint the issue and recommend the necessary repairs or replacements.

no signal for the injectors
check cam/crank position sensors
check immobilizer operation
check ecm and harness connections

What is year--make--model? Check for voltage and ground at fuel injector. Check fuel pressure.

Did you check fuel pressure with a gauge? Autozone, some others, rent or loan fuel pressure gauges. If fuel pressure is good, check injector circuit. Each injector has two wires-power and ground. With key on- engine off, each injector should have battery voltage on the power wire (each power wire would be same color to all injectors)-use a test light or voltmeter to check for power.

If injectors have power to them with key on, post back and I can tell you how to check injector ground circuit with a test light. .... well here, you clip the test light lead on the POSITIVE battery post, and stick tester probe into the ground side terminal of injector connector. Now have someone crank the engine over: if ground circuit is good, the test light should be blinking. If both tests work, power and ground circuit, then injector circuit is good and they should be pulsing to spray fuel into the cylinders. Let me know what you find.

Sometimes a crankshaft sensor does not send the signal to fire either the spark or the fuel injectors. If the fuel pump relay is not getting power, the inertia sensor will not have power either. The inertia reset is just magnetic and does not depend on having power to reset.

You can check for current at the Inertia sensor and at the fuel pump relay. You can also have fuel pressure at the test port without the injectors working, which is the easiest test of all,

You need the sequential firing pulse for the injectors. Have you checked the EEC Relay?

Maybe your injector circuit is not working. Pull off one injector connector and check for power on one of the two wires to the injector-turn key to on, and one wire should have power. If no power with key on, pull off all injector connectors and recheck for power- a shorted injector may shut down the injector circuit, that's why to pull off all injector connectors. If still no power on one wire to each injector, diagnose the injector drive circuit. Also check the fuse for injectors.

REPLACE THE FUEL INJECTOR CANT REBUILT IT.IF YOU REMOVE FUEL INJECTORS FUEL RAIL YOU HAVE TO REPLACE GROMMETS AND O RINGS ON ALL THE FUEL INJECTORS IF NOT YOU WILL HAVE A INTAKE LEAK AT THE OLD FUEL INJECTORS SEALS.REPLACE THE FUEL INJECTOR YOU REBUILT THEY HAVE TO BE REPLACED.

CODE PO205 - IS INJECTOR 5. YOU NEED TO USE FUEL INJECTOR NOID TEST LIGHT OR A STETHOSCOPE TO CHECK ALL FUEL INJECTORS TO SEE OR HEAR WHAT FUEL INJECTOR NOT WORKING.USE TEST LIGHT IF BLINKS FUEL INJECTOR GETTING POWER.THE STETHOSCOPE USE IT LIKE A DOCTOR TO HEAR WHAT FUEL INJECTORS WORKING.YOU SHOULD HEAR CLICKING NOISE IF YOU HEAR NO INJECTOR NOISE AND IT IS GETTING POWER.THE FUEL INJECTOR IS FAULTY.

my injectors have no power ging to them. i just replaced fuel pump and relay. i have fuel going to my 350 tbi but nothing coming out the injectors. it wont start and i have no power at the injector so i dont know if its the ecm or what

There should always be power at the injectors as long as the fuel pump is on. The fuel injection ECU provides a ground to the injectors to turn them on.
You most likely have a bad fuel injection ECU. This is a very common failure on 88,89 and 90 SAABs.