Where is the idle button on a GM TBI?
The “A” and “B” terminals are located on the top right of the connector. Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier.
How do you check fuses on a GMC TopKick?
To access the fuse blocks, gently squeeze both sides of the cover to unlatch the tabs at the top. Then, unsnap both attachments at the bottom and remove the cover. How to check the fuses?
How to replace the throttle position sensor system in GMC?
Replacing the sensor is essential for good performance. Turn off the engine and raise the hood of the GMC vehicle. In most cases, remove the air cleaner that covers the throttle body. Locate the accelerator linkage. Just opposite the throttle lever, on the opposite side of the throttle body, the throttle position sensor is located.
What happens when the throttle moves on a GMC?
As the throttle moves, a voltage signal ranging from 0.5 volts to 5.0 volts is sent to the engine computer. If the sensor fails, the computer has no precise control over the engine fuel delivery.
The “A” and “B” terminals are located on the top right of the connector. Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier.
To access the fuse blocks, gently squeeze both sides of the cover to unlatch the tabs at the top. Then, unsnap both attachments at the bottom and remove the cover. How to check the fuses?
How do you change the idle speed on a T-30?
Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench. Reconnect the IAC valve.
How does the GM TBI fuel injection system work?
The GM TBI (Throttle Body Injection) system uses a pair of low pressure fuel injectors mounted above the throttle body opening. Unlike a port fuel injection system, that sprays fuel into the intake manifold runner just above the intake valve, the injectors in this system spray fuel directly into the throttle body above the throttle plate.
Where is the diagnostic connector on a GM TBI?
Unfold a paper clip and bend it into a “U” shape. Push the ends of the paper clip into the “A” and “B” terminals of the ALDL (Assembly Line Diagnostic Link) connector, also called the diagnostic connector. In GM vehicles that use this TBI injection, the connector is a black plastic rectangular connector located under the driver side of the dash.
The GM TBI (Throttle Body Injection) system uses a pair of low pressure fuel injectors mounted above the throttle body opening. Unlike a port fuel injection system, that sprays fuel into the intake manifold runner just above the intake valve, the injectors in this system spray fuel directly into the throttle body above the throttle plate.
Unfold a paper clip and bend it into a “U” shape. Push the ends of the paper clip into the “A” and “B” terminals of the ALDL (Assembly Line Diagnostic Link) connector, also called the diagnostic connector. In GM vehicles that use this TBI injection, the connector is a black plastic rectangular connector located under the driver side of the dash.