GM 3.5L Index of Articles

How To Test For A Blown Head Gasket (GM 3.5L, 4.2L)

How To Test For A Blown Head Gasket (GM 3.5L, 4.2L)

There are 3 very common tests that are done to find out if the head gasket is blown on your GM 3.5L or 4.2L equipped pickup or SUV. These three tests are: Checking that the engine oil isn't mixed with coolant. Checking that there isn't...   read more >>

How To Diagnose A P0135 -Heater Performance Bank 1 Sensor 1 (GM 3.5L)

How To Diagnose A P0135 -Heater Performance Bank 1 Sensor 1 (GM 3.5L)

If your check engine light is on and you have a diagnostic trouble code P0135 stored in the PCM's memory... then you've come to the right place to test and troubleshoot the upstream oxygen sensor. A P0135 DTC says: HO2S Heater Performance Bank 1...   read more >>

How To Diagnose A P0141 Heater Performance Bank 1 Sensor 2

How To Diagnose A P0141 Heater Performance Bank 1 Sensor 2

Diagnosing a BAD oxygen sensor that's making the check engine light light (CEL) up with a P0141 isn't hard at all. In this tutorial, I'll show you how to do it with a multimeter. This article applies to several GM makes and models... you can...   read more >>

How To Test The Intake Air Temp (IAT) Sensor (GM 3.5L)

How To Test The Intake Air Temp (IAT) Sensor (GM 3.5L)

As you might already be aware (and if you're not, well that's OK, too)... the intake air temperature (IAT) sensor is part of the mass air flow (MAF) sensor. The MAF sensor has a total of 5 wires. Three of them are dedicated to the MAF part and...   read more >>

Ignition Coil-On-Plug (COP) Test (GM 3.5L, 4.2L)

Ignition Coil-On-Plug (COP) Test (GM 3.5L, 4.2L)

Testing the ignition coils on your 3.5L 5 cylinder or 4.2L 6 cylinder is not that hard to do and I'll show you how to do it in this tutorial. As you may already be aware, this type of ignition system is known as COP coil system. The acronym COP...   read more >>

How To Test The Mass Air Flow (MAF) Sensor (GM 3.5L)

How To Test The Mass Air Flow (MAF) Sensor (GM 3.5L)

Testing to see if the MAF sensor on your 3.5L GM equipped car or pickup or SUV is BAD or not can easily be done with a multimeter. In this article I'll show you how to do it in a step-by-step fashion... that will either condemn the mass air flow...   read more >>

How To Diagnose The MAP Sensor Testing P0106, P0107, P0108

How To Diagnose The MAP Sensor Testing P0106, P0107, P0108

In this tutorial, I'm gonna' show you the fastest and surest way to test the manifold absolute pressure (MAP) sensor on your 3.5L or 4.2L equipped GM pickup or SUV. Not only that, the MAP sensor test I'm gonna' show you doesn't require a scan tool...   read more >>

How To Test The MAF Sensor and Codes: P0100, P0101, P0102, P0103

How To Test The MAF Sensor and Codes: P0100, P0101, P0102, P0103

In this test tutorial, I'll show you how to test the Mass Air Flow Sensor to see if its BAD (and lighting up the Check Engine Light) or not. This MAF Test is done in 3 easy steps. All you'll need, to test the MAF Sensor (with this tutorial) is a... read more >> (at: easyautodiagnostics.com)

How To Check Engine Compression (GM 3.5L, 4.2L)

How To Check Engine Compression (GM 3.5L, 4.2L)

In this tutorial, I'll show you how to do an engine compression test on your 3.5L (5 cylinder) or 4.2L (6 cylinder) equipped GM pickup or SUV. Why check the engine compression? Well, because piston rings and cylinder head valves do wear out and...   read more >>

How To Test For A Blown Head Gasket (GM 3.5L -FWD)

How To Test For A Blown Head Gasket (GM 3.5L -FWD)

There are 3 very common tests to check for a blown head gasket, and in this tutorial, I'm gonna' show you how to them in a step-by-step fashion. 2 of the 3 can be done in minutes and with absolutely no tools. The third is done with a compression...   read more >>