Question about 2005 Chevrolet Uplander

1 Answer

Check code engine po171

Replace the oxygen sensors, hose, fuel pump works well, everything seems fine without vacuum, she runs well but the failure continues (runs 15 miles and the light back on) (P0171 code) if you turn off the engine and wait for 5 minutes the engine will not start. Waits for 10-20 minutes there can start the engine.

Posted by on

  • 1 more comment 
  • Don Garretson
    Don Garretson Apr 22, 2014

    Hi chivopacion f, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box?
    Specifically what the code is.

  • _-__-___-_
    _-__-___-_ Apr 23, 2014

    and what engine under the hood. what size, cylinder count. 3.5 L LX9 V6, 3.9 L LZ9 V6, 3.9 L LGD V6 that code is engine code. why not read the FSM, and see what that DTC means, it tells you the MAF is bad. (or loose wires to it,or just dirty) the book explains what to do, or at ALLDATA.COM log in and read. or things that make the MAF look bad and its not the maf, here is a list, (more tests) 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 cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor, the code simply means the 02 sensor is stuck lean, more , why not learn to use google, here is one good hit. Random;http://troubleshootmyvehicle.com/gm/4.3L...

  • _-__-___-_
    _-__-___-_ Apr 23, 2014

    the key fact here, is did you run the scan tool full time driving, to see if other codes (DTC) are popping up, 174 after all the car has 2 cylnder banks and 1 oxy sensor on each. and if only one sensor fails, that tells me its an exhaust leak. find it with a rubber hose to your EAR, and hear that putt putt sound, bingo bad exhaust man. or just a bad gasket. the 02 is not fibbing, its sees illegal oxygen, there. causes by 2 things. cracks letting air in, or gross misfire on that side, there are many tests to find it, , why not get an ASE mech. to find it.

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 97 Answers

I'd be more concerned at looking into the fact that it takes a while to cool off in order to start up again. P0171/174 codes mean a lean condition. I'd suspect that you may have a problem with Vapor lock on the one bank, which is causing air to form in the fuel rail on that side. Since air compresses, the fuel pressure doesn't necessarily come up enough to restart the engine until the fuel has cooled down enough to stop boiling. Did this start happening once the weather in your area started getting warmer?

Posted on May 08, 2014

6 Suggested Answers

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

countrysi248
  • 443 Answers

SOURCE: Chevy S10 starts and then shuts off.

well i would try squirting fuel into the throttle body when it is in its not running mode. if it starts and runs you know the fuel pump is at fault .. or its not getting the right fuel pressure from it..

Posted on Feb 10, 2009

  • 140 Answers

SOURCE: 1999 Chevrolet S-10 Check Engine Light

YEAH MAN I KNOW WHAT YOU ME, THOSE DARN COMPUTER ARE WAY TO SMART.. THERES NOTHING WRONG, BUT YOU CAN TAKE THE TRUCK TO A GM DEALER AND THEY CAN FLASH THE COMPTUER, BUT THE ONLY DOWNFALL IS THAT THE CHECK ENGINE LIGHT WILL NEVER WORK AGAIN.. SO ITS YOUR CALL..GOOD LUCK KEITH..

Posted on Mar 12, 2009

bitchn65cuda
  • 70 Answers

SOURCE: 1996 s10 2.2 engine starts but idles rough and will not rev up.

Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

Posted on Apr 29, 2009

nate6556
  • 103 Answers

SOURCE: 2004 colorado code p0172

check your gas cap. If you fill your gas while the vehicle is running, it will also cause your light to come on. Go to OReilys or Autozone and they will shut it off for free and tell you the problem

Posted on Jul 25, 2009

johnjohn2
  • 5763 Answers

SOURCE: I have a 2007 Equinox check engine light came on i

that car is under warranty for emmision failuare, it a federal law, also you changed wrong sensor poo36 and poo54 mean o2 sensor after the cat-converter is no good not the first one by engine, replace the one after cat and problem will be fixed. good luck.

Posted on Nov 05, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have the codes are po171 ..po174


code p 0171 refers to system too lean bank 1===causes --intake /exhaust leak---air system---MAF/VAF sensor--fuel pressure / pump---injector/ s---HO2S
code p 0172 refers to system too rich, bank 1===causes --intake blocked ---EVAP canister purge valve --fuel pressure --EGR system---injector/s -=-- HO2S
code p 0173 refers to fuel trim(FT) bank 2--malfunction===causes --intake leak---air system--fuel pressure /pump---injector/s --EVAP canister purge valve---HO2S
code p 0174 refers to system too lean, bank 2===causes intake / exhaust leak---fuel pressure /pump---injector/s---Air system---hose connection/s
I was not sure if you wanted all codes or just the first and last, however you will see that there are some common problems that may help point you in the right direction
1-- is the heated oxygen sensor (HO2S) which is the sensor before the cat converter
2--is the fuel pressure , so a fuel pressure test will determine if a regulator or fuel pump problem,
3--EVAP canister purge valve --replace as required
4--intake / exhaust leak --check for vacuum hose failure including hoses to vent controls and check the flexible exhaust connection before the cat converter for leaks
The rest are there to check if you haven't fix the fault before you get to them

Nov 05, 2015 | Cars & Trucks

1 Answer

What is po171 code mean


PO171 means the engine is running lean(that means that the engine is getting too much oxygen rather than fuel)! Although replacing the 02 sensor has a chance of solving it, unfortunately it doesn't always do so.

Are there any symptoms? Rough running at any point? Loss in power? Idle problems?

This could be caused by many things: A vacuum leak, EVAP system not working properly, injector(s) clogged, or fuel pump/fuel filter issue.
There is also a very small chance that the O2 sensors become contaminated by certain types of silicone sealants installed in improper areas of the engine. I think that this last possibility would take a long time to show up in the computer.

Do you have access to an OBD2 scanner that shows live data? If so, I can give you more info how to try and pinpoint this problem.

Oct 09, 2014 | 2001 Ford Explorer Sport

1 Answer

My engine idles and runs fine but has codes po171 and po174


Your still lean on both banks

Either the oxygen sensors failed or slowed
down & set a code or you have vacuum leaks

When ever you remove an intake-- you smoke it before
& after the job-- to avoid vacuum issues

Fuel Trim may give you some idea where to start

Can be rich both banks & driven lean

Dec 17, 2012 | 2002 Ford F150 Regular Cab

1 Answer

My car has code PO171 WHAT DOES IT MEAN?


This means your engine is running too lean on the fuel-air ratio. Get this fixed as it can damage the engine after a while.

Possible causes are



• Air intake leak (hose loose)
• Fuel line pressure low
• Injector blockage
• Heated oxygen sensor malfunction
• Mass air flow meter fault
• Engine coolant temp. sensor failed

The most likely cause is the oxygen sensor

Aug 03, 2012 | 1992 Toyota Camry V6

1 Answer

P 0171 (m)


PO171 refers to "system too lean - bank #1", This means that the upstream oxygen sensor detected too much oxygen in the exhaust. Cleaning out the MAF (mass air flow) housing and sensor will help eliminate the PO171 code. It's also necessary to clean the upper portion of the engine and fuel injectors, to make sure they are not clogged or "fouled." check for vacuum leaks and around intake manifold. spray around manifold with engine running, if it flares up you have a leak. in most cases. cleaning the MAF sensor does the trick !

May 03, 2012 | Jeep Grand Cherokee Cars & Trucks

2 Answers

Help on finding out wind star coads PP0171-/-P074-/-P0401


first PO171 o2 bank 1 s1 lean PO174 o2 bank2 lean
PO401 cyl 1 misfire
when an engine misfires the oxygen sensor will read the oxygen from that cyl sensor doesnt read fuel so every misfire is a air pump to diagnose we have to fix misfire first check the coil wires and plugs for cyl 1 use spray bottle with water run engine hot at idle spray wires with water if enging runs rough shakes or stalls then replace the wires dont spray with to much water if the wires are real bad you may not be able to restart engine

try this first once fix misfire clear codes and drive it

plz comment vote reply if you need more help

Jan 17, 2011 | Ford Windstar Cars & Trucks

1 Answer

1998 FORD CONTOUR CHECK ENGINE CODES P1131 AND PO171. REPLACED 1 OF THE OXYGEN SENSORS, CHANGED PLUGS, PLUG WIRES, OIL AND FILTER, ALSO REPLACED AIR FILTER AND CLEANED PCV FILTER, RESET PC AND IT RAN GOOD...


sounds like EGR valve and sensor this controls idle speed when at a stop. the po171 is a burn lean or rich code need to know what bank 1 or 2. also check for a vacuum leak from one of the hoses.

Aug 07, 2010 | 1998 Ford Contour

2 Answers

HAVE A 99 GRAND PRIX WITH CODE P0171 SYSTEM LEAN-BANK 1. I REPLACED THE OXYGEN SENSOR ON THE REAR MANIFOLD THAT IS CHANGEABLE FROM TOPSIDE. LIGHT/CODE IS STILL COMING ON AND SHUTTING OFF BY ITSELF. CAR HAS...


po171 is a lean code, and could be likely caused by a plugged fuel filter, or a weak fuel pump, I would recommend changing the fuel filter first since its cheaper.. The filter is located under the rear of the vehicle by the fuel tank, if this doesn't help run, or have run a fuel pressure check to determine if that is the cause. Also look carefully under the hood for any hoses or lines disconnected causing a vacuum leak, this can also cause a lean code

Jan 09, 2010 | 1997 Pontiac Grand Prix

3 Answers

Code reading p0171


Hi:
So your car's CEL (Check Engine Light) is on and you had the codes scanned at a local parts store. Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. A lean code or codes indicate that there's too much oxygen in the exhaust. Remember parts stores have employees that have good intentions but they may not have the experience necessary to interpret what the trouble codes really mean. These codes are based on oxygen measurements in the exhaust. A common mistake with lean codes is to replace the oxygen sensors. This could be a very expensive mistake that will not fix the problem. Especially if both codes are present, because the chance of both O-2 sensors failing at the same time is very unlikely.
Most likely the cause is a vacuum leak. A vacuum leak can be caused from a vacuum hose, intake gasket or maybe even a leak in the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that may lead you to the source of the problem. Some technicians will use a propane bottle with a hose attachment to help pinpoint vacuum leaks. With today's computers it's not quite as easy to check for vacuum leaks this way because the ECU (Electronic Control Unit) will compensate quickly for the added fuel and a change in idle is harder to notice. Oxygen sensor readings can be monitored with a scan tool while checking for leaks with propane, by looking for increased readings when enriching the mixture. Another way technicians can check for vacuum leaks is with a smoke test. By introducing smoke into a vacuum hose on the engine, the leak will be revealed when the smoke escapes from the problem area.
Aftermarket air filters that use oil on the element can sometimes damage the MAF. Over oiling the air filter may allow some excess to get on the MAF sensor wire or element. This can alter the reading, fooling the ECU into seeing more or less air flow therefore changing the air/fuel mixture incorrectly. I once worked on a car that would not start that had a problem with a MAF. When looking at the wire in the MAF, there was a burned piece of trash that made it's way past the air filter. After cleaning the sensor the car ran perfectly. The ash that was on the MAF sensor wire was altering the reading by enriching the mixture so much that the car could not run. After talking with the customer, he said the air filter was just changed. This was obviously when some trash got into the air intake hose that settled on the hot wire of the MAF.
Fuel Pressure could also cause a lean condition. If the fuel filter is clogged or the fuel pump pressure is low, there could be higher level of oxygen in the exhaust also. Most of the time though, the ECU will compensate for the reduced fuel volume. So this is one of the least likely causes of a lean code.

Nov 20, 2009 | 2003 Pontiac Vibe

4 Answers

P0171 and p0174 codes


P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.

Sep 10, 2009 | 2002 Jaguar X-Type

Not finding what you are looking for?
2005 Chevrolet Uplander Logo

160 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

74896 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7688 Answers

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

Answer questions

Manuals & User Guides

Loading...