GM 3.1L, 3.4L Index of Articles

How To Test The Blower Motor (GM 3.1L, 3.4L)

How To Test The Blower Motor (GM 3.1L, 3.4L)

Sooner or later your 3.1L GM vehicle's blower motor is gonna'go bad and will need to be replaced. If you've never troubleshooted one, then you've come to the right place since this tutorial will show you how to test it in a step-by-step...   read more >>

How To Test: P0420 OBD II Trouble Code (GM 3.1L, 3.4L)

How To Test: P0420 OBD II Trouble Code (GM 3.1L, 3.4L)

OBD II trouble code P0420 Catalyst Efficiency Below Threshold (Bank 1) is one of the most common codes encountered on the GM 3.1L, 3.4L equipped cars and mini-vans. Usually, this code points to a bad catalytic converter but not always... since...   read more >>

How To Test The MAP Sensor With A Multimeter (GM 2.8L 3.1L, 3.4L)

How To Test The MAP Sensor With A Multimeter (GM 2.8L 3.1L, 3.4L)

Testing the GM manifold absolute pressure (MAP) sensor on your GM 2.8L, 3.1L, or 3.4L V6 equipped car can be accurately done using only a multimeter and a vacuum pump. This article will show you how to bench test it (although you'll be leaving...   read more >>

How To Troubleshoot A No Start (GM 3.1L, 3.4L)

How To Troubleshoot A No Start (GM 3.1L, 3.4L)

Getting to the bottom of what is causing your GM 3.1L/3.4L car (or mini-van) to crank but not start is not that difficult. In this tutorial/article I'll share some of my knowledge and experience so that you can find the exact cause of your...   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 >>

How To Avoid A Blown Head Gasket (GM 3.1L, 3.4L)

How To Avoid A Blown Head Gasket  (GM 3.1L, 3.4L)

If you've had the misfortune of having to replace or are in the process of having to replace the head gaskets on your GM 3.1L or 3.4L equipped GM vehicle... you may be wondering if it's possible to avoid a repeat of the problem. The answer is: Yes,...   read more >>

How To Test The Oxygen Sensor (GM 3.1L, 3.4L)

How To Test The Oxygen Sensor (GM 3.1L, 3.4L)

You're gonna' be surprised just how easy it is to diagnose the oxygen sensor (O2 sensor) on your 3.1L, 3.4L OBD II equipped GM Vehicle. Testing them will save you some bucks ($$$), since so many different conditions can trick the PCM (Powertrain...   read more >>

Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3.1L, 3.4L)

Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3.1L, 3.4L)

This is a real life case study that will help you diagnose a hard to find misfire. Although this case study involves a 2000 Chevy Monte Carlo (with a 3.4L V6), you can apply this info to any 3.1L or 3.4L GM equipped vehicle (see the Applies To box...   read more >>

How To Test The Fuel Pump -No Start Tests (GM 3.1L, 3.4L)

How To Test The Fuel Pump -No Start Tests (GM 3.1L, 3.4L)

I'm going to show you two different methods to verify if the no start condition on your 3.1L or 3.4L GM vehicle is due to a lack of fuel... which usually means that the fuel pump has gone BAD. One method involves using just starting fluid and...   read more >>

Coolant Leaking From Intake Gaskets (GM 3.1L, 3.4L)

Coolant Leaking From Intake Gaskets (GM 3.1L, 3.4L)

One of the most common problems on the GM 3.1L and 3.4L engines is coolant leaking from the intake manifold gaskets. This problem has been a gold mine for GM and the auto repair industry. Although GM has been aware of this problem ‘since man...   read more >>