Question about 2000 GMC Sierra

2 Answers

Codes 171 174 2002 gmc sierra 5.3

Codes 171 and 174 showing lean in both banks. Changed plugs and wires, truck started running good. Codes came back a couple of hours later. Truck still runs fine. Possibly Injectors?

Posted by on

Ad

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

If both 171 and 174 come up (both banks lean) suspect Mass Airflow Sensor or fuel pressure issue.....according to autozone's troubleshooting guides

Posted on Nov 21, 2012

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 6,826 Answers

Try some injector cleaner in order to see if the lean condition improves. Lean conditions can sometimes be caused by o2 sensors or other sensors that are not within specifications.

Posted on Jul 08, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Replaced 02 sensor with code 131 and 171 now getting p0053


Code 53 is for a problem with the heater in the O2 sensor for bank one sensor one. It could be something in the wiring or you could have a defective sensor.

Jan 13, 2013 | 2005 GMC Sierra

1 Answer

2003 GMC Sierra Has recently developed rough idle/lope at idle which sometimes goes away. Runs fine otherwise. Scan codes-Lean condition bank1 and bank2. Random misfires on all cylinders. Fuel pressure...


You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
Then you lean O2 Codes will go away.

Not a the plugs.

Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors

Nov 24, 2010 | 2003 GMC Sierra 1500

1 Answer

I have a 2003 GMC Denali with Codes P171 & P174 lean on both banks. What is the problem? Fuel pump?


More likely it's the intake manifold gasket leaking. They can become flat and **** air in passed the gasket, causing a lean condiiton.

Oct 02, 2009 | 2004 GMC Sierra Denali

1 Answer

Rough idle


Yes bad o2 sensor,check for vacuum leaks also.do you cross your plug wires?

Jun 26, 2009 | 1999 GMC Sierra

2 Answers

SOILED PLUGS


171 is a lean bank one check for vacuum leak at the intake manifold

Mar 12, 2009 | 2003 GMC Sierra 1500

2 Answers

1985 gmc sierra shakes


Nic, If the carburetor was dumping gas, remove the engine oil dip stick and see if it smells like gasoline. If it does you will need to change the oil.
Second, go back over your spark plug wires and verify they are on the correct spark plug. Start with the #1 plug wire, the firing order is 1,8,4.3.6.5.7.2...
Let me know how it turns out and we can go from there.
Good luck.

Feb 26, 2009 | 1985 GMC C2500

Not finding what you are looking for?
2000 GMC Sierra Logo

884 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...