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What does it mean when your air ratio is running lean

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Lean is to much fuel rich is not enough too rich and it will run hot lean it can't burn all of the fuel.

Posted on Jan 10, 2013

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Code P0171


P0171 - System Too Lean Bank 1 Share
1 ' Add Comment Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
What does this mean? Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
What does this mean? When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0171 Description
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).
Read more: http://www.autocodes.com/p0171.html#ixzz3t65yA9xI

Dec 01, 2015 | 2004 Nissan Titan

2 Answers

I have a 2000 Lincoln ls v6 engine light is on 'the system to lean bank 2' what does that mean?


If it is running too lean it means that you are getting too much air to gas ratio. You probably have an air leak somewhere or need an adjustment to fix the problem.

Dec 18, 2014 | 2000 Lincoln LS

1 Answer

What is the code 171 mean on my dodge ram 1500


P0171 Chrysler - Fuel System Lean

Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption


P0171 Chrysler Description
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).




P0171 Chrysler Fuel System 1 1 Lean

Sep 04, 2014 | Cars & Trucks

1 Answer

My 98 ford zx2 has the service engine soon light on, and the code says it's running lean, and my revs get stuck up 500-1000 rims higher than normal, what usually causes this?


Look for vacuum leaks.. look at the hose that connects the air cleaner to the throttle body.. looking for cracks, disconnected hoses, broken hoses.. Could be a OX sensor.. but usually that will set a code. Lean means you have a high ratio of air to fuel.. so you are looking for air leaks.

Aug 21, 2014 | Cars & Trucks

1 Answer

Codes too lean, stalls when warm. replaced o2,MAF,filter, plugs and coils


Check for air leaks with a water spray from an old spray bottle. Run the engine and spray around gasket seams and Vacuum lines.

Lean code means too much air, not too little fuel. Engine is dumping fuel to get correct fuel ratio.

Mar 22, 2014 | 2005 Lincoln Aviator

1 Answer

Just bought a 95 z 28 its all ready had k&n cold air intake, phantom air to fuel ratio, and vacuum gauges and a port to plug a lap top into so i was told, the air to fuel ratio gauge is showin its...


Cheap air/fuel gauges simply tap off the stock oxygen sensor. That sensor can only tell you lean or rich and the car should idle roughly at 14.7:1 and go rich under acceleration. Cruise down the highway at steady 50 mph and see what the gauge does. Should be calmer.
At idle the needle can bounce around quite a bit. Means nothing. It should however go sometimes rich and sometimes lean. That's how the computer adjusts, if it stays lean too long, the computer tweaks the injectors richer. If it stays rich too long, the computer tweaks it leaner. If the computer cannot adjust the ratio, it will set the check engine light and in that case it should be a flashing check engine (meaning stop the car and tow it to a shop - flash means the catalytic converter can burn out).
If you want to know the actual air-fuel ration you need to buy a wide/band oxygen sensor and related gauge. They are much more expensive and will typically run a few hundred dollars. If the car is stock except for K&N, don't bother with the air/fuel gauge.
As for computer hookup. Go read up about "LT1Edit". Don't buy the software (too expensive for a stock car) but you'll understand what software is out there to monitor your engine (and what hardware you need to buy in order for your laptop to talk to your car).

Apr 16, 2011 | 1995 Chevrolet Camaro

2 Answers

OBD2 METER READS ENGINE TOO LEAN


Lean running condition A lean running condition means that the air/fuel mixture is unbalanced, and that the engine is getting either too much air, not enough fuel, or a combination of both. Optimally, this ratio should be around 14.7 parts air to 1 part fuel by mass, at low or cruising loads. This ratio is known as stoichiometric for gasoline. Ideally, at WOT, you should aim between 11.5:1 (Rich best torque at WOT) and 13.3:1 (Lean best torque at WOT).
Running lean, like having your spark timing too advanced, creates much more heat during the combustion process. This can lead to piston seizure, a hole in the piston, melted spark plug electrode or other complications due to overheating. You will not be producing peak power, and your exhaust will also emit more oxides of nitrogen, arguably one of the worst byproducts of gasoline combustion for our environment.
Common causes of a lean running condition are an improperly tuned carburetor, clogged fuel line, clogged fuel filter, or a vacuum leak.
Preforming a plug chop is a good way to find out if your engine is running too lean, as you will see a powdery white residue on your spark plug in the presence of a lean condition.
On the other end of the spectrum, richer ratios will also cause lost power, however this will most likely be accompanied by black smoke (around the 9:1 fuel/air ratio area), and fouled spark plugs.

May 30, 2010 | 2002 Saturn VUE

1 Answer

Obd 171 - too lean. what does this mean and how


If the vehicle runs out of fuel, the air-fuel ratio is Lean and DCT P0171 is recorded. the MIL then comes on. Try clear the P0171, see it come back on.

Apr 22, 2010 | 2001 Toyota Echo

1 Answer

Don't know what system lean bank means.


hi it means you have a lean fuel/air ratio on the cylinders on that side of your engine look for air leaks [hoses gaskets loose manifold bolts etc yates210456

Oct 19, 2008 | 1996 Plymouth Neon

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