1996 cherokee 4.0
not getting any fuel from injectors to throttle body but when a hot wire is ran to the injectors it fires up could it be the fuel regulator any help would be greatly appreciated
Have you done a fuel pressure check yet and if so what were the readings. I'm posting on how the throttle body works.
THROTTLE BODY - 4.0L ENGINE
Filtered air from the air cleaner enters the intake manifold through the throttle body Throttle Body - 4.0L Engine Fuel does not enter the intake manifold through the throttle body. Fuel is sprayed into the manifold by the fuel injectors. The throttle body is mounted on the intake manifold. It contains an air control passage Throttle Body - 4.0L Engine controlled by an idle air control (IAC) motor. The air control passage is used to supply air for idle conditions. A throttle valve (plate) is used to supply air for above idle conditions.
The throttle position sensor (TPS), idle air control (IAC) motor and manifold absolute pressure sensor (MAP) are attached to the throttle body. The accelerator pedal cable, speed control cable and transmission control cable (when equipped) are connected to the throttle arm.
A (factory adjusted) set screw is used to mechanically limit the position of the throttle body throttle plate. Never attempt to adjust the engine idle speed using this screw. All idle speed functions are controlled by the PCM.
THROTTLE BODY - 4.0L ENGINE
Filtered air from the air cleaner enters the intake manifold through the throttle body Throttle Body - 4.0L Engine Fuel does not enter the intake manifold through the throttle body. Fuel is sprayed into the manifold by the fuel injectors. The throttle body is mounted on the intake manifold. It contains an air control passage Throttle Body - 4.0L Engine controlled by an idle air control (IAC) motor. The air control passage is used to supply air for idle conditions. A throttle valve (plate) is used to supply air for above idle conditions.
The throttle position sensor (TPS), idle air control (IAC) motor and manifold absolute pressure sensor (MAP) are attached to the throttle body. The accelerator pedal cable, speed control cable and transmission control cable (when equipped) are connected to the throttle arm.
A (factory adjusted) set screw is used to mechanically limit the position of the throttle body throttle plate. Never attempt to adjust the engine idle speed using this screw. All idle speed functions are controlled by the PCM.



