Question about 1998 Buick LeSabre

7 Answers

P0171 Code (Lean Fuel Bank 1) Engine light on

Car runs fine other than a slight hesitation on acceleration. P0171 Code still exists after replacing fuel filter and gas cap. Also, checked air intake for any leaks to permit to much air into system. At a loss what to check or do next?

Posted by on

  • 1 more comment 
  • kagion Nov 27, 2008

    Found a couple places where there was a vacuum leak. Repaired those places and the hesitation on acceleration went away. The system lean fault still persisted. Broke down and replaced the o2 sensor. The fault is still showing up but seems to be intermittent now. I am unable to test fuel pressure or vacuum pressure and at a loss as to what else to do other than run it into a garage for repair.

  • tingle01 Jan 27, 2009

    I am having the same problem. Engine light keeps coming on showing a p0171 code on a 2001 ford focus. I have replaced fuel filter. Had my fuel injectors cleaned as well as changing spark plugs and wires. I have replaced oxygen sensor before cataletic converter. Do not know what else to do. Please help

  • Anonymous Mar 14, 2014

    2004 trailblazer was sitting in driveway for 3 months with gas leek. replaced fuel pump leek vent away now the vehicle is fluttering with code p0300 randim missfire and p0171 running lean?

×

7 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 303 Answers

You nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

Posted on Nov 23, 2008

  • You need to double check for vacuum leaks. Get a can of carb cleaner, and with engine running spray around any vacuum hoses, when the idle picks up, that's where the leak is. Listen really good for a sucking noise, also.

×

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

PO 171 indicates a lean condition in bank 1 or the same side of the engine as the first cylinder , usually it is caused by a vacuum leak some where check to make sure that even the smallest of vacuum hoses are in good condition and not leaking

Posted on Dec 05, 2008

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Po171 is your mass air flow sensor. An expensive part but worth the money

Posted on Mar 02, 2009

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Thank you. Checking for additional vacuum leak with the carb cleaner was great. Found one other vacuum leak with a pinched o-ring. P0171 code has cleared.

Thanks again.

Posted on Dec 01, 2008

  • Michael Maczuga
    Michael Maczuga Feb 09, 2011

    where was the o ring that you found pinched? and did the code come back
    at all because I am having the same problem

×

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

YES I SOLVED THIS!

There is a recall in ford focuses for the fuel pump. If anyone goes to the Ford dealership and complains about acceleration, hesitation, or stalling will get a new fuel pump with models after 2000. P0171 is the trouble code for this, it means that the pistons aren't getting enough of fuel versus air.

Posted on Mar 22, 2009

  • 1 more comment 
  • Alex5853 Apr 29, 2011

    Had P0171 message on my car. Car kept running but wasn't very happy. Checked fuel pump, replaced fuel filter, checked sensors, checked vacuum, everything turned out to be ok.
    Just accidentally we noticed one vacuum tube at the rear of the engine being sucked flat. It came in its normal form when the engine was shut off.
    Replaced the tube and the engine ran smooth again. OBDII gave normal readings on fuel trim again. Took me weeks to find out.

  • drnathansmit Apr 29, 2011

    Mine is a 2002 focus ZX5, I am having the same issue. Where exactly was that hose you found that was kinked when the engine was running?

  • Howard Kalnas
    Howard Kalnas Apr 18, 2013

    I read your post about the recall and was relieved. Then I tried a search of the recall on an 03 focus. I found NO mention anywhere. I then called a Ford dealer and he checked and No Record of any recalls of fuel pumps for that year or any other. He even ran my VIN. I checked my PCV hose, checked my DPFE sensor, my EGR VALVE Vacuum Solenoid, my EGR VALVE. All are working properly! I've been spraying Carb Cleaner all around and cannot find any air leaks. I took my MAF sensor out and clened the heck out of it. All made no differance. Unfortunately there is no way to "check" a MAF sensor. I hate to buy something without being sure, but i just might.

×

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 12 Answers

Just an off the wall, out of the box thought. Possibly the intake manifold plenum has cracked allowing more air to enter the combustion chamber causing the "vacuum leak" symptom of a lean condition. Often times, a leaking plenum will exhibit symptoms similar to a blown head gasket, such as misfire in the morning with plumes of water vapor and a noticeable decrease in water volume in the reservoir. Bank 1 indicates the O2 sensors location in the system. Bank 1 is the O2 Sensor just before the bend to the catalytic converter and Bank 2 is positioned right after the cat.

Posted on Feb 09, 2015

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 14 Answers

What are your fuel trims reading on both banks that is the best way to diagnose lean conditions if fuel trims are jumping around you deffinetly have vacumn leak after mass air flow sensor

Posted on Feb 12, 2015

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

Check Engine light


This is a lean Code. What is happening is too much air is entering the engine and the O2 sensor is making the engine run rich to rebalance the fuel ratio.

You need to find the leak. Use a spray bottle of water while the engine is running. When you spray over the leak, the rpm will change or the engine may even stall. This is where repair is needed.

Mar 29, 2014 | 1996 Ford Explorer

1 Answer

2001 nissan sentra 1.8L 4cyl. running codes P0105:P1605:P0171:P0325... engine idles fine when in park just not in gear, in gear it shakes pretty bad, also hesitates to accelerate when you press on gas...


code po105 refers to manifold absolute pressure(MAP)sensor/barometric pressure (BHARO) sensor -circuit malfunction==causes--wiring MAP sensor--BARO sensor--ECM
code p0171 refers to system to lean bank 1===causes intake/exhaust leak---AIR system MAF/MAP sensor fuel pressure /pump /injectors--HO2SW
code p0325 refers to knock sensor(KS) 1 bank 1-circuit malfunction====causes--wiring ---poor connections---KS
Check the exhaust flexible pipe at the manifold for cracks
have a fuel pressure test done on the fuel manifold to determine either pump/ filter or pressure regulator.
replace HO2S unit

Sep 21, 2013 | Cars & Trucks

1 Answer

P0102 maf or vaf A low circiut input is the code what are the possible solutions I have recently replaced the fuel pump, fuel filter and air filter. When i start the van refs high if i slightly push on the...


You have also tried replacing the Mass air flow sensor. How does it run with it unplugged? You can also get all your symptoms and the MAF code from a plugged catalytic converter.

Jul 13, 2010 | 2001 Pontiac Montana

1 Answer

Check engine light on auto zone read codeP0404 replaced egr valve,air filter, added sea foam, and high octane booster. car still has check engine light on reading same code will not accelerate hesitates if...


When it revs high, is it down shifting? if so you may be running out of gas. low fuel pressure or lack of fuel getting to the injectors. (fuel filter)

May 02, 2010 | 2002 Chevrolet Impala

4 Answers

2009 toyota corolla hesitates when accelerating. when acceleration in normal speeds, there is a delay of about 4-5 seconds in hesitating during acceleration. no engine lights are on at all. has about...


If you own a 2004, 2005, 2006 or 2007 Toyota Corolla and your car hesitates when you accelerate or it hesitates when driving, you should try the solution described here. Below is a list of the behavior your car may show that tells that you should try this procedure before going to a mechanic or repair shop.
  • The accelerator is slightly pressed while the car is running and it slightly jitters or hesitates
  • After completely stopping the car (a red light for example), it hesitates when you accelerate to continue driving
  • Engine power is below the usual level
  • Sometimes check engine light turns on
You should know that while those problems can be caused by several issues, including low quality or altered fuel or even a loosely tighten fuel cap, the most common cause is a dirty MAF flow meter sensor.
The MAF sensor (Mass Air Flow Meter Sensor) is in charge of detecting how much air (in mass, not volume) is coming in to the engine, so the ecm computer can calculate the amount of fuel to be injected.
Some times this sensor gets contaminated by lots of microscopic debris that scape the air filter and accumulate on its sensing parts over time. The resulting effect is that the MAF flow meter sensor gets less "sensible" and detects less air than it is currently entering the engine. The reaction of the ecm computer will be to inject less fuel to keep the air fuel balance, taking as reference the false reading of the MAF flow meter sensor. This will produce a too-lean mixture, which is responsible of the hesitation, the loss in power and the check engine light.
If your car engine, besides the hesitation, is also producing knocking or engine pinging at high loads, like when going up through a hill, it is attributed to this too-lean condition.
Before going to an auto parts store or to a mechanic to fix the problem, you should try fixing it your self. If the problem is a dirty MAF flow meter sensor, the solution is to clean it, plain and simple. That may save you some money that a mechanic will charge for cleaning it (you could do the same) or for replacing the part when most of the times it is not damaged, just dirty or contaminated

Apr 06, 2010 | 2009 Toyota Corolla

3 Answers

When I accelerate I get hesitation, I replaced the


It can be a few things that cause this.Mass air flow sensor,Map sensor,clogged fuel filter,timing not correct(cause by the knock sensor).I would replace the fuel filter first.Thats the cheapest thing.If problem still exists.Go to a local AutoZone or Pepboys and have them scan for a bad sensor code.Its FREE.Then replace what ever sensor is the problem

Nov 08, 2009 | 1998 Chevrolet Prizm

1 Answer

My 1997 Jeep Grand Cherokee Laredo is starting to have a ''slight'' hesitation after I shut it off and re-start it again. WHen I accelerate at first it hesitates a bit. I let off the gas for a few seconds...


A slight hesitation after engine shut off due to engine running rich meaning not meeting golden air:gas ratio of 14.6:1 so fuel residue in chamber continue to burn for the last moment. The same rich fuel problem that was why you had to let gas off during acceleration. Need to Check out the O2 sensor Check out MAP sensor Good luck

Sep 13, 2009 | 1997 Jeep Grand Cherokee

1 Answer

Car hesitation


had a problem with a grand prix like that once, was the fuel filter, and injectors, all needed replaced, and it only had 89,000 miles.
Would check fuel filter first. Is it possible you got some bad gas??

Jul 05, 2008 | 2004 Chrysler Sebring

Not finding what you are looking for?
1998 Buick LeSabre Logo

11,850 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts

yadayada
yadayada

Level 3 Expert

70387 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6880 Answers

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

Answer questions

Manuals & User Guides

Loading...