My 94 3.1l pickup will not start.I have spark no pulse,but 12 volts on all four wires to the injectors.I have also noticed that my chek ingine light is not coming on when I try to start the truck,also not hearing the fuel pump ome on
SOURCE: no pulse at injectors
The normal way that injectors are controlled is via the permanent application (ignition on obviously) to one side of the coil that operates the enclosed piston, and the precisely timed application of ground (negative) to the other side of the coil.
The transistors that control this switching under the command of the engine computer are typically contained within the computer itself.
Measuring the voltage at the injectors is not productive since the common multimeter is incapable of detecting the very short pulses that activate the coil. Some kind of visual means would be needed to observe this pulse such as an oscilloscope or an engine analyzer equipped with a 'scope.
It's unlikely that all of the switching transistors (or the injectors) have failed simultaneously so either the computer has a problem or there is no fuel being delivered to the fuel rail that feeds the injectors.
You should find a pressure regulator that sits between the fuel line coming from the tank that controls the fuel pressure for the injectors.
This device seem to be a sore point in many vehicles and can make it appear that the injectors are not working.
Many fuel rails have a fitting similar to a tire valve to allow the testing of the pressure being delivered. I would recommend you check this before assuming that the injectors are at fault.
SOURCE: 2004 Isuzu Rodeo 3.5ltr 4X4 hesitation/misfire acceleration
The upper intake gaskets may be leaking. They are made of plastic and metal and will leak air. Do not remove the cover on very top of manifold when changing.
SOURCE: Isuzu Hombre pickup, 2.2L Vortec, Won't Start.
You need four things for an engine to run. 1. fuel 2. spark 3. compression 4. timing (spark at the right time. By your post it seems you have fuel and spark and you probably have compression unless you blew a head gasket. That leaves the timing. Check the timing and/or the timing belt or chain whichever you have.
SOURCE: electrical problem is keeping throttle body from working
The injector needs a signal to open.
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