GM 4.3L, 5.0L, 5.7L Index of Articles

1994 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L)

1994 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L)

NOTE: The illlustrations and info in this page apply only to 1994 Chevrolet/GMC pickups with a 4.3L, 5.0L or a 5.7L engine. For the 1993 fuel pump wiring diagram, check out the following article: 1993 Fuel Pump Circuit Tests (GM 4.3L, 5.0L,...   read more >>

1994 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS With A/T)

1994 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS With A/T)

The 1994 throttle body fuel injection (TBI) system's computer has 2 connectors. One is red and the other is a blue one. Each connector has 2 rows of 16 slots for a total of 32 slots. One row of the RED PCM's connector is prefixed with the letter...   read more >>

Bad PCM Causing TPS Sensor Code (1993-1994 GM 4.3L, 5.0L, 5.7L)

Bad PCM Causing TPS Sensor Code (1993-1994 GM 4.3L, 5.0L, 5.7L)

This tutorial will help to test the throttle position sensor (TPS) circuits between the PCM and TPS connector to see if they are shorted together or ‘open’ (or not). More importantly, this tutorial will help you to come to an...   read more >>

1993 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L)

1993 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L)

NOTE: The wiring diagram illustrations in this article cover only: 1993 4.3L, 5.0L, and 5.7L GMC/Chevrolet pickups with the 4L60-E automatic transmission. For the 1994 fuel pump wiring diagram, check out the following article: 1994 Fuel Pump...   read more >>

Diagnosing A Stuck Open EGR Valve (GM 4.3L, 5.0L, 5.7L)

Diagnosing A Stuck Open EGR Valve (GM 4.3L, 5.0L, 5.7L)

This tutorial addresses a very common problem I've seen on the 1987-1995 GM 4.3L, 5.0L, and 5.7L engines with throttle body fuel injection system: a stuck open EGR valve. And when the EGR valve gets stuck open, it'll cause a rough idle condition...   read more >>

1995 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS with A/T)

1995 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS with A/T)

The 1995 throttle body fuel injection (TBI) system's computer has 2 connectors. One is red and the other is a blue one. Each connector has 2 rows of 16 slots for a total of 32 slots. One row of the RED PCM's connector is prefixed with the letter...   read more >>

Bad PCM Causing MAP Sensor Code (1993-1994 GM 4.3L, 5.0L, 5.7L)

Bad PCM Causing MAP Sensor Code (1993-1994 GM 4.3L, 5.0L, 5.7L)

Is there a good chance that the PCM has fried and is the one causing the MAP sensor trouble code that NEVER goes away no matter what you do or replace? The sad answer is yes. I have diagnosed and repaired this specific problem quite a few...   read more >>

Instrument Panel Fuse Box (1993 GM 4.3L, 5.0L, 5.7L)

Instrument Panel Fuse Box (1993 GM 4.3L, 5.0L, 5.7L)

In the table below you'll find the fuse location and description of the fuses of the fuse box on 1993 4.3L, 5.0L, 5.7L TBI equipped 4.3L, 5.0L, and 5.7L pickups. IMPORTANT: The fuse box illustration and fuse descriptions cover the vehicles in...   read more >>

1993 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS w/ 4L60-E)

1993 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS w/ 4L60-E)

The 1993 throttle body fuel injection (TBI) system's computer has 2 connectors. One is red and the other is a blue one. Each connector has 2 rows of 16 slots for a total of 32 slots. One row of the RED PCM's connector is prefixed with the letter...   read more >>

How To Test The Fuel Pump On GM TBI Fuel Systems

How To Test The Fuel Pump On GM TBI Fuel Systems

As you're already aware, the throttle body fuel injection system on your 1987 to 1995 4.3L, 5.0L, or 5.7L pickup (or SUV) uses a low pressure (12 PSI) electric fuel pump located in the gas tank. And although GM did not include a Schrader valve...   read more >>