Question about 2002 Ford Mustang

1 Answer

Car Running lean o2 sensor is fine.

Just like the title says. My car is running lean in the first bank and it's not the o2 sensor. Please Help!!!!!!!

Posted by on

  • 1 more comment 
  • dylanksimmon Jun 03, 2009

    when you push the clutch in when coming to a stop it idles at 900 rpm to a 1000 then when you actually come to a complete stop being in nuetral the motor will bog down to 4 to 500 rpms. then sometimes it dies or idles fine. when driving it runs fine.

  • dylanksimmon Jun 03, 2009

    but only one side is running lean. bank one. every mechanic i have talked to has said it's not the sensor or the whole car would run lean.

  • Mike Butler
    Mike Butler May 11, 2010

    Hows it running?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 272 Answers

Most likely your MAF sensor is dirty. It is a very delicate wire that reads airflow in your intake and tells the fuel distribution system how much time to open the injectors. Here's a link to some Ford ones so you know what you are looking for.

http://www.americanmuscle.com/maf.html

They can be cleaned, here's a general how too. If you google MAF Sensor clean you'll find videos and lots of helpful hints! Just make sure you remove the sensor from the vehicle and allow it to fully dry before replacing it.
Mass airflow sensors constantly measure the amount of air entering the intake manifold. This lets the engine management computer know how much gasoline to inject into the cylinders for proper combustion. Hot-wire-type sensors, like you have, work by keeping a short piece of wire or film at a constant, elevated temperature. An electrical current is applied to the wire to maintain its temperature; the amount of current necessary to maintain the temperature is proportional to the mass of cool air flowing past it. Sounds complicated, but there are no moving parts and the response rate is very fast. So far, so good.
Eventually, dirt and oily film bake onto the wire, insulating it from the cooler air--and when the engine management computer sees a value for air mass that's too far out of range, it sets an error code. Periodically, there's a cleaning cycle during which the wire is heated to a very high temperature right after engine shutdown. This burns off deposits.
When this cleaning cycle fails to remove all of the contaminants, you're supposed to replace the MAF sensor. According to almost every manufacturer, it's not recommended or even possible to clean the delicate wires. Of course, they're selling those sensors, so their motivation might be suspect. Next time, I'd try cleaning it first--what do you have to lose? I used to use aerosol carb cleaner, but CRC MAF Sensor Cleaner is new and less prone to dissolving other components in the MAF sensor. Do yourself a favor and remove the MAF sensor from the vehicle before attempting to clean it. Also, I'd make sure the air filter housing, air filter and all associated ducting are intact, clean inside and not leaking dirt. This will keep you from needing to clean or replace the MAF sensor anytime soon.

Posted on Jun 03, 2009

  • 1 more comment 
  • rjbeg123 Jun 03, 2009

    I'd have helped you if you'd just asked a question or clarified but when you give me a rating like that you're usually on your own. I actually have a very good idea of what the issue is after reading your response. Here is the list of possiblities right out of Fords tech manual....What does that mean?

    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).

    Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

    Symptoms

    You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

    Causes From the book again!!

    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 (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
    • There could be a vacuum leak downstream of the MAF sensor.

    Oh shock and horror! Look it listed the MAF sensor! I've been working on cars for over 35 years and I know what I'm talking about! Clean the MAF check for leaks, check all of the little rubber hoses that they are patent (not leaking) and connected......follow these steps and don't trash people in your ratings if you really want help...



    Possible Solutions

    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 MAF 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

  • rjbeg123 Jun 03, 2009

    Here is the rest of the list of posibilities from the Ford Manual:



    Air Measurement System


    • MAF sensor (contaminated, damaged, malfunctioning, etc.)

    Fuel System


    • Fuel pressure regulator (leaking, malfunctioning, etc.).

    • Fuel filter plugged, dirty.

    • Fuel pump (weak, check valve leaking, etc.).

    • Leaking/contaminated fuel injectors.

    • Low fuel pressure or running out of fuel.

    • EVAP canister purge valve leaking (when canister is "clean").

    • Fuel supply line restricted.

    • Fuel rail pressure sensor (incorrect reading).

    Air Induction System


    • Air leaks after the MAF.

    • Vacuum Leaks.

    • PCV system (leak, valve stuck open, etc.)

    • Improperly seated engine oil dipstick.

    Exhaust System


    • Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).

    EGR System


    • EGR valve tube/gasket leak

    • EVR solenoid vacuum

  • rjbeg123 Jun 03, 2009

    Not sure what 'mechanics you've talked to. The technitions and engineers at Ford motor company sure seem to think that the MAF may very well be your issue....as do I. They can be cleaned, there are products available specifically for cleaning the MAF sensor. Try it.

×

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:

3 Answers

2002 gmc envoy 4.2 liter 6 cyl code reads bank 1 too lean


too lean can be from leaking manifold, vacuum leak, injectors on that bank, low fuel pressure

Aug 02, 2015 | GMC Cars & Trucks

1 Answer

Car running lean on bank 2, changed intake gaskets and pcv valve


what does exhaust smell like you may have carbon build up in engine try removing o2 sensors and cleaning with brake clean and reinstalling reset code and see if it comes back and how long it takes to reset also you can put a can of berryman in the gas tank with at least 1/2 tank of gas or more also buy a can of sea foam and install through vacuum booster hose you may see lots of black smoke from tail pipe if so after following instructions for application drive some what hard and if the black smoke continues fore at least a mile keep driving and if you notice a diff in runability but still have a little black smoke buy another can of sea foam and repeat service NAPA has sea foam on sale this month

Apr 11, 2012 | 1996 Chevrolet Impala SS

2 Answers

Codes 177 and 188 appear what should I do to fix this?


CODE PO177 O2 SENSOR RICH BANK 2. CODE PO188 FUEL SYSTEM LEAN LIMIT PART THROTTLE BANK 2. CHECK FUEL PRESSURE YOU HAVE LEAN FUEL SYTEM CAUSED BY A STOP UP FUEL FILTER OR WEAK FUEL PUMP. AND REPLACE O2 SENSOR.

Feb 23, 2011 | Mercury Sable Cars & Trucks

2 Answers

Codes 171 174 2002 gmc sierra 5.3


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.

Jul 08, 2010 | 2000 GMC Sierra

1 Answer

Pluged in the computer to my truck and it said there is a o2 sensor malfunction of bank 2. how do i find it? also it says the truck is running to lean. is this cause by the o2 sensor?


Yes, this too lean runing engine is due of oxygen O2 sensor malfunction. Must be replaced with new one. You can find it very simply on bank 2. The bank 1 of V8 engine is the cylinder bank on the right (passenger's) side of the car, (for Left Hand Drive vehicles). So the bank 2 is placed on the left (driver's) side of the car, (for Left Hand Drive vehicles). The bad oxygen O2 sensor is fitted on bank 2, so you can replace it.

Please rate my response. Thanks!

Apr 11, 2010 | Ford F-150 Cars & Trucks

3 Answers

Engine code p0171 right bank running to lean


This sounds like an O2 sensor, there are 4 O2 sensors, 2 for each bank, 2 up stream by the exhaust manifold and 2 down stream by the catalytic converter. However the information you have given is limited, the explanation for the code seems to be missing some information. Ex: right bank sensor 1 to lean.

Sep 02, 2009 | 1997 Pontiac Grand Prix

1 Answer

Location of O2 sensor in bank 2, 99 5.4 expedition, running lean


I have a ford 2003 windstar that was running very rough when cold and almost stalling. engine light came on. went to autozone and they read the codes for free and told me it was running lean on Bank 2 also. i came home searched for the O2 front sensors online using the info autozone gave me. there are 2 front sensors on my car that need to be replaced at the same time. look for ones that have a direct plug in and don't need wire splicing. the ones without the wiring harness are cheaper but more of a pain, i think.
they were fairly easy to replace. getting access with the wrench was the worst. reset the light by disconnecting the battery for a few minutes. seems fine now and the light hasn't come back on.

Jan 24, 2009 | 1999 Ford Expedition

1 Answer

What are the descriptions for these DTC's PO171 & PO174 ?


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

They have to do with fueling the engine. Usually when a car is running a less-than-optimal fuel mixture, it's traceable to O2 sensors, mass airflow sensor, or sometimes a coolant temperature sensor. These all have a direct effect on the fuel mixture. If your O2 sensors have been in the car for more than 60k miles, I'd change them first, as they have the biggest impact on fuel mixture. I don't know what year your car is, but if it's 95 or older, there is only one sensor per bank of cylinders. If it's 96 or newer, you'll have four - two before the catalytic converters, and two after them. The ones you'd want to change are the pre-cat O2 sensors, closest to the engine. These are used for determining fuel mixture. The post-cat O2 sensors are there for monitoring the cats' efficiency.

Aug 03, 2008 | Chevrolet Chevy Cars & Trucks

Not finding what you are looking for?
2002 Ford Mustang Logo

1,429 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75077 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

fordexpert

Level 3 Expert

5471 Answers

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

Answer questions

Manuals & User Guides

Loading...