got compression ?? Assuming YES, are the spark plugs wet fuel fouled ( wont fire ) , or dry, proper gap and ready to fire yes compression....yes spark.....My mechanic said it seems to be getting to much fuel.
How about the crank position sensor and sensor wire harness.
Check fuel pressure to be sure it's in spec. If it is, then you must check the injectors for pulses.
Simply put these engines use an injection system called HEUI or Hydraulically-actuated, Electronically-controlled Unit Injectors. These injectors require a high pressure oil pump to supply the injectors oil pressure to actuate the internal injector piston to push fuel into the system. No oil pressure, no fuel.
The electronics shuts off the current to the coil and injectors are usually under pressure so when there is no current in the coil the force of back pressure shuts the injector. -_- max
The truck doesn't have a freon pressure gauge. That is a tool that the repairman/mechanic has.The truck doesn't have a freon pressure gauge. That is a tool that the repairman/mechanic has.
Basically, yes.
the fuel pressure is around 30psi
A 2003 GMC Yukon does not have self cleaning fuel injectors. A high pressure cleaning system must be directly connected to the injectors to performing a cleaning.
Your injectors stopped working because either they have failed and need to be replaced or else there is inadequate fuel pressure to open them.
The fuel pressure regulator maintains 41 to 47 psi to the fuel injectors.
Check the fuses
To clean fuel injectors on a 1997 S10, first disconnect fuel pump from fuel injectors. Disconnect pressure regulator and connect the cleaning kit to the fuel port.
Replacing fuel injectors is a complex process that includes various steps. Before you replace injectors you should have them tested. Steps to replace would be , releave fuel pressure, disconnect batery, and unplug the injectors and replace.