GM 3.1L, 3.4L Index of Articles
How To Test The Blower Motor (GM 3.1L, 3.4L)
- February 11, 2014
- Updated: August 02, 2020
- Written by: Abraham Torres-Arredondo

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)
- April 12, 2013
- Updated: August 01, 2020
- Written by: Abraham Torres-Arredondo

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 the... read more >>
How To Test The MAP Sensor With A Multimeter (GM 2.8L 3.1L, 3.4L)
- April 30, 2011
- Updated: July 30, 2020
- Written by: Abraham Torres-Arredondo

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)
- December 25, 2012
- Updated: August 01, 2020
- Written by: Abraham Torres-Arredondo

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
- August 21, 2012
- Updated: January 25, 2020
- Written by: Abraham Torres-Arredondo

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)
- September 23, 2012
- Updated: August 01, 2020
- Written by: Abraham Torres-Arredondo

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)
- July 22, 2011
- Updated: July 30, 2020
- Written by: Abraham Torres-Arredondo

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)
- September 12, 2012
- Updated: August 01, 2020
- Written by: Abraham Torres-Arredondo

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)
- March 21, 2011
- Updated: July 30, 2020
- Written by: Abraham Torres-Arredondo

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 the... read more >>
Coolant Leaking From Intake Gaskets (GM 3.1L, 3.4L)
- August 30, 2012
- Updated: July 30, 2020
- Written by: Abraham Torres-Arredondo

One of the most common problems on the GM 3.1L and 3.4L V6 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... read more >>