1999 Chevrolet Silverado 1500 Logo
Posted on Feb 02, 2010
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

1999 Chevy silverado 5.3 engine setting codes p171 p174 already replaced mas air flow and checked for leaks

Answer This Question

2 Answers

Anonymous

Level 2:

An expert who has achieved level 2 by getting 100 points
MVP:

An expert that got 5 achievements.
Sergeant:

An expert that has over 500 points.
Champion:

An expert who has answered 200 questions.

  • Expert 226 Answers
  • Posted on Feb 04, 2010
Anonymous
Expert
Level 2:

An expert who has achieved level 2 by getting 100 points
MVP:

An expert that got 5 achievements.
Sergeant:

An expert that has over 500 points.
Champion:

An expert who has answered 200 questions.

Joined: Dec 31, 2008
Answers
226
Questions
1
Helped
137638
Points
618

Oxygen sensor failure
P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
hope this is a bit of a push in the right direction ...

Anonymous

Level 1:

An expert who has achieved level 1.
New Friend:

An expert that has 1 follower.
Mayor:

An expert whose answer got voted for 2 times.
Problem Solver:

An expert who has answered 5 questions.

  • Contributor 1 Answer
  • Posted on Mar 23, 2010
Anonymous
Contributor
Level 1:

An expert who has achieved level 1.
New Friend:

An expert that has 1 follower.
Mayor:

An expert whose answer got voted for 2 times.
Problem Solver:

An expert who has answered 5 questions.

Joined: Feb 26, 2010
Answers
1
Questions
3
Helped
2337
Points
2

1999 Chevrolet Silverado 5.3L keeps giving codes 171, 174 so we replaced all the O2 sensors still won't run right, then we replaced the mass air sensor, then the map sensor, and still it gives me the same codes over and over and will not run right. It was running down the freeway just fine and then this just started out of the blue with the lean bank in 1 and 2, there is nothing more to replace, and it does not set the code sitting in place and revving the engine, it only acts up when driving or under a load persay. I have been throught the entire fuel management system and replaced every part, so can you please tell which .22 cent part I missed that is causing all this grief to the tune of over 450.00. mjw

  • Unk Jim Feb 27, 2011

    I have same problem does any one answer this? ? I am thinking maybe fuel pump . where to find its pressure requirements so I can test it?

  • thomas johnston
    thomas johnston Oct 20, 2013

    u need to get a fuel gauge and put it on the fuel rail nipple it sould be around 50 psi if lower u have a bad fuel pump

×

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

0helpful
1answer

2011 Chevy Silverado 2500 he codes p171 and p174 found no leaks with else could it be
How to Diagnose Codes P0171 P0174 Lean Bank 1 2

Well gents did quick search for this and found nothing so here it goes...

The slightest leak can pop the codes.
Read full answer
Dec 30, 2017 • Cars & Trucks
0helpful
3answers

Changed the mass air sensor and temperature sensor and I have still have codes p171 & p174 on my 96 thunderbird lx hellp
p0171 p0174 indicate lean ...check for vacuum leaks around intake manifold...spray carb cleaner(or brake cleaner if flammable)around intake manifold..if rpm goes up you have a vacuum leak....fix leak ..clear codes and test drive.....at least two drive cycles
Read full answer
Apr 01, 2014 • Cars & Trucks
0helpful
2answers

1999 Chevrolet Silverado, 5.3, 1500, 148K Miles. Problem when cold it has a miss under a load, but it will idle good. After warmed up no problem. After checking for a vacuum leak we replaced the following:...
This is just a stab in the dark, have you checked the hydraulic lifters? I had a similar symptom on a 4 cylinder engine and it turn out to be a stuck valve lifter.
Read full answer
Oct 22, 2013 • 1999 Chevrolet Silverado 1500
1helpful
2answers

99 ford f250 6.8 litre engine i have anti freeze in my two front spark plug ports on the passenger side
could be intake, could be head gasket. take the radiator cap off and fill it to the brim with water, then start the engine and look for bubbles in the water. you might have to top it off while it's running to get a good reading. if any of the plugs you took out were much cleaner than the rest, or had a white crust deposit on them, the head gasket is probably the culprit.
Read full answer
Feb 27, 2013 • Cars & Trucks
1helpful
2answers

Why does my 2001 dodge intrepid shut off while in motion?
po108 check for vaccum leak ,check cracks around engine.check air fiter,mas air flow sensor try to clean,is between air filter and engine.DO NOT DAMEGE,try to remove dirt,spray on it,cleaner.
Read full answer
Feb 07, 2013 • 2001 Dodge Intrepid
1helpful
1answer

Keep getting ses codes p507 p171 p174
The codes you show are all about air leaks. The 507 is about the IAC and may simply be the system noting the connection was unplugged.

The 171,174 are lean codes and usually mean more air is coming in than is needed. Did you use a water mist to check for leaks? Have you checked Vacuum solenoids for leaks?, the EGR diaphram?

You did not indicate the engine and vehicle this problem was on. Some of the 6 cylinder products had sandwich type manifolds and the upper and lower chambers had a gasket which would dissolve and leak internally.

Some people have had problems with the runners on dual plane manifolds, but I question whether a 171, or 174 could generate from this defect.

I think you should retest with a water spray after clearing the computer.
Read full answer
Jan 24, 2012 • Cars & Trucks
0helpful
2answers

Have 2002 chevy avalanche 1500 ( over 140,000 miles) multiple codes p137,p157,p158,p171, & p174..O2 sensors changed last year including both cats. Check engine light goes on then clears then goes back...
sounds like a sensor is loose maybe not have good contacts?
Read full answer
Sep 11, 2010 • 2002 Chevrolet Avalanche
1helpful
1answer

Dodge 2004 p171 p174
p0171-- system to lean (bank 1)----p0174-- system to lean (bank 2 ). bank 1 is the side that #1 cylinder is on. bank 2 is the other side. the cause may be bad 02 sensors on both banks, or a exhaust leak. also you may want to check and clean the mass air flow sensor. for the sensor will set the same code as 02 sensors. good-luck!!
Read full answer
Aug 11, 2010 • Dodge Durango Cars & Trucks
13helpful
2answers

99blazer s10 trouble codes p171/p174
P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

P0174 is identical to P0171, except it indicates the problem exists on Bank 2 as well.
Read full answer
Nov 22, 2009 • 1999 Chevrolet S-10 Pickup
0helpful
1answer

Check Engine Light On
have the 02 sensors checked
Read full answer
Jan 20, 2009 • 2001 Ford Explorer
Not finding what you are looking for?

View Most Popular

1999 Silverado 1500

  • Cars & Trucks

Related Question

2011 Chevy Silverado 2500 he codes p171 and p174 found no leaks with else could it be

  • Cars & Trucks

Related Topics

2,347 views

Ask a Question

Usually answered in minutes!

Popular Questions

00 Chevy Silverado... ABS EBCM diagram help??? Brake line hookups

2000 Chevrolet Silverado 1500

Front Hub Bearing Torque specs to complete replacement

2003 Chevrolet Silverado 1500

Electric Radiator Fan Does Not Come On

2007 Chevrolet Silverado 1500 2WD

Where is fuel pump relay for 2003 chevy silverado

1999 Chevrolet Silverado 1500

Windshield wipers will not turn off - 2003 Chevrolet Silverado

2003 Chevrolet Silverado 1500

Check Out the Latest Top Trucks Report!
Check Out the Latest Top Trucks Report!

View all Fixya Reports

Top Chevrolet Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

john h

Level 3 Expert

29494 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

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

Answer questions

Manuals & User Guides

PDF Manual
2010_chevrolet_silverado_owners.pdf....

1999 Silverado 1500

PDF Manual
2010_chevrolet_silverado_owners...

1999 Silverado 1500

Loading...