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

‘Spider’ Fuel Injector Misfire and Hydrolock (Troubleshooting Case Study)

‘Spider’ Fuel Injector Misfire and Hydrolock  (Troubleshooting Case Study)

This case study will help you to diagnose a ‘Spider’ fuel injector that is stuck open due to the PCM having fried and causing one of two things: A misfire condition or an engine hydrolock condition (a no crank condition caused by...   read more >>

No Start - No Fuel 'Spider' Fuel Injector Troubleshooting Case Study

No Start - No Fuel 'Spider' Fuel Injector Troubleshooting Case Study

The most common type of failure in the CPI ‘Spider’ fuel injector system is usually fuel leaks (inside the intake manifold plenum). But, every now and then, instead of leaking fuel, the ‘Spider’ fuel injector assembly...   read more >>

ECT Sensor Test (P0117, P0118) (GM 4.3L, 5.0L, 5.7)

ECT Sensor Test (P0117, P0118) (GM 4.3L, 5.0L, 5.7)

This article will help you to troubleshoot the engine coolant temperature (ECT) sensor on your GM 4.3L, 5.0L, or 5.7L equipped pick up, van, mini-van or SUV. You can either use a multimeter or a scan tool (w/ Live Data capability) to diagnose...   read more >>

How to Test the Crank Sensor (GM 4.3L, 5.0L, 5.7L)

How to Test the Crank Sensor (GM 4.3L, 5.0L, 5.7L)

This article will help you to troubleshoot and diagnose a BAD crankshaft position sensor on your 4.3L, 5.0L and 5.7L Vortec equipped GM Pick Up or SUV. Since the 3-wire crankshaft position (CKP) sensor can not be tested by a multimeter...   read more >>

How to Test the Thermostat (GM 4.3L, 5.0L, 5.7L)

How to Test the Thermostat (GM 4.3L, 5.0L, 5.7L)

When the thermostat, in your GM 4.3L, 5.0L or 5.7L pick up, SUV, or van fails, it does one of two things: it stays stuck open or stuck closed. If it stays stuck closed, your pick up (van or SUV) will overheat. If it stays stuck open (or if it's...   read more >>

Troubleshooting P0172 and P0175 (GM 4.3L, 5.0L, 5.7L)

Troubleshooting P0172 and P0175 (GM 4.3L, 5.0L, 5.7L)

Diagnosing trouble codes: P0172 (System too Rich Bank 1) and/or P0175 (System too Rich Bank 2) can be a challenge on your GM 4.3L, 5.0L, 5.7L equipped GM pick-up, van, SUV or mini-van. What complicates getting to the bottom of what's causing...   read more >>

Shift Solenoid A and B Tests (GM 4.3L, 5.0L, 5.7L)

Shift Solenoid A and B Tests (GM 4.3L, 5.0L, 5.7L)

In this article, I'll show you how to test the transmission shift solenoids (specifically 1-2 solenoid and 2-3 solenoid) on your GM 4.3L, 5.0L, 5.7L pick up, van, SUV. You'll be surprised just how easy it is to diagnose these shift solenoids...   read more >>

How to Test the 'Spider' Fuel Injector Assembly (4.3L, 5.0L, 5.7L)

How to Test the 'Spider' Fuel Injector Assembly (4.3L, 5.0L, 5.7L)

Testing a leaking ‘Spider’ fuel injector assembly or a leaking fuel pressure regulator (GM 4.3L, 5.0L, or 5.7L ) can seem impossible, since both of these bad boys are located inside the intake manifold's plenum... but they can be tested...   read more >>

How to Troubleshoot a No Start (GM 4.3L, 5.0L, 5.7L)

How to Troubleshoot a No Start (GM 4.3L, 5.0L, 5.7L)

Testing a Cranks but Does Not Start condition on your GM 4.3L, 5.0L, 5.7L pick up, van or SUV is not that hard to do, if you have a solid diagnostic strategy. In this article I'll show you the basics of testing such a problem. I'll also explain...   read more >>

Testing Diagnostic Trouble Codes: P0135, P0141, P0155, P0161

Testing Diagnostic Trouble Codes: P0135, P0141, P0155, P0161

This article will help you to diagnose diagnostic trouble codes: P0135, P0141, P0155, P0161 on your GM 2.2L, 2.4L, 3.1L, 3.4L, 3.8L, 4.3L, 5.0L, 5.7L. All of these trouble codes have to do with a malfunction in the oxygen sensor's heater or it's...   read more >>