GM 3.8L Index of Articles

How To Test The Thermostat (GM 3.8L V6)

How To Test The Thermostat (GM 3.8L V6)

In this article, I'll show you how to test the thermostat, to see if it's stuck open or closed, without removing it from the engine. As you might already be aware, when the thermostat fails... it does one of two things... either the engine...   read more >>

How To Test A Blown Head Gasket (GM 3.8L)

How To Test A Blown Head Gasket (GM 3.8L)

If you suspect that your 3.8L GM vehicle (whether it's a Buick, a Chevy, a Pontiac, or an Olds) has a blown head gasket and don't know how to test this... well, you've found the right article. I'm gonna' show you how to do four of the most common...   read more >>

P0135, P0141 Test Basics O2 Heater Performance Problem (GM 3.8L)

P0135, P0141 Test Basics O2 Heater Performance Problem (GM 3.8L)

In this tutorial, we'll cover some of the basics you need to know to troubleshoot and diagnose diagnostic trouble codes P0135 and P0141 on your 3.8L equipped GM vehicle. If you've researched these two trouble codes (online or in a automotive...   read more >>

How To Test The Cam Sensor -P0341 (GM 3.8L)

How To Test The Cam Sensor -P0341  (GM 3.8L)

Testing the camshaft position sensor and/or diagnostic trouble code (DTC) P0341, on your 3.8L V6 equipped GM car or mini-van, is an easy test that can be done using only a multimeter. No scan tool is needed for this test! Now, since the cam sensor...   read more >>

How To Test the Upstream Oxygen Sensor P0131, P0132, P0133 (GM 3.8L)

How To Test  the Upstream Oxygen Sensor P0131, P0132, P0133 (GM 3.8L)

If the upstream oxygen sensor has failed, one of the most obvious symptoms besides the check engine light (CEL) being on, is really BAD gas mileage. In this article, I'll show you how to test the oxygen sensor (commonly known as the O2 sensor)...   read more >>

How To Test The 3.8L GM Crank Sensor With A Multimeter

How To Test The 3.8L GM Crank Sensor With A Multimeter

The 3X-18X crankshaft position (crank) sensor, on the GM 3.8L V6 engine, can easily be tested (to find out if it's bad or not) with a multimeter. With this article, I'll walk you thru' the entire crank sensor testing process in a step-by-step...   read more >>

How To Do An Engine Compression Test (GM 3.8L)

How To Do An Engine Compression Test (GM 3.8L)

Testing the compression of each cylinder or a specific engine cylinder is becoming a standard test when troubleshooting hard to diagnose misfire conditions on the GM 3.8L V6 equipped cars and mini-vans. A low compression condition in any of the...   read more >>

How To Test The Fuel Injectors (GM 3.8L)

How To Test The Fuel Injectors (GM 3.8L)

A BAD fuel injector can cause your 3.8L Buick (or Chevrolet, or Pontiac, or Oldsmobile) to idle rough, miss, and make the check engine light come on (if the vehicle is ODB II equipped, you could see misfire codes: P0300, P0301, P0302, P303, P0304,...   read more >>

How To Do A Fuel Injector Noid Light Test (GM 3.8L)

How To Do A Fuel Injector Noid Light Test (GM 3.8L)

A fuel injector, on your 3.8L V6 GM vehicle (Buick, Chevrolet, Oldsmobile, Pontiac) can stop working and cause a Rough Idle and/or Misfire Condition if it doesn't get power (12 Volts) or its injector pulse signal from the PCM. Of course, this will...   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 >>