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Fuel metering too lean why ?

Check engine light on

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A lean fuel mixture is usually caused by unmetered air entering the motor. ( vacuum leak ). Have a look for any disconnected or broken vacuum hoses. Take a look at the air intake tube from the air filter to the throttle assembly to make sure it is tight and connected properly. A weak fuel pump or a restriction in the fuel filter can also cause a lean condition. Another problem could be a MAF sensor giving false readings.

Posted on Apr 06, 2015

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1 Answer

I have got misfire,there are vaccum leak


leaks.! why not fix that, first thing???????
no engine option stated.
but if the engine is MAF based, it will go lean (air/fuel mix) with ANY un-metered air leaks. (illegal)

that flash CEL means you will burn the CAT up ,if you keep driving
the operator guide tells you that, read it.

when all cars glow the CEL the mech, uses a scan tool
to scan PCM to see all the errors
im sure you have P0300 (misfire DTC errors) USA cars.
but there may be others, why not scan it and look????????????

running lean and flogging the engine can burn valves too.

1: check fuses
2: scan it,
3: report.
or its 2 days hard work , doing it the hard way.

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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

2006 Toyota Corolla Code P0171 What could be the problem?


po171 means the air fuel ratio is lean (not enough fuel) so you must check for anything that can do that a good example would be a vacuum leak that allows non metered air to enter the engine (more air same amount of fuel = lean mixture) or a clogged injector (same amount of air less fuel = lean mixture as well)

Jan 06, 2010 | 2003 Toyota Corolla

2 Answers

Check engine light keeps coming on. Lean fuel


A lean code can be caused by several different things. The most common, if you are getting a lean code on BOTH banks, is a dirty Mass Airflow Sensor (MAF) Cleaning the MAF usually fixes it.

If not, it could be caused by anything from a crack in a vacuum line to a bad fuel pump. (Anything that could make the engine run lean.)

Oct 31, 2009 | 1997 Mercury Cougar XR7

3 Answers

Toyota Harrier yr2001. been great so far. engine


the knock sensor should also be checked this can cause the engine light to come on a few minutws after driving begins

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1 Answer

98 Lincoln Navigator Check Eng light on


fuel pump is going out causing the truck to run lean and miss

Aug 22, 2009 | 1999 Lincoln Navigator

2 Answers

Code 171 check engine light on 2000 corolla


sounds like you have a bad fuel injector a good service station can read the individual injector pulses and see, check spark plugs is one extra dirty or clean? clean leaking injector dirty no fuel

Jul 06, 2009 | 1998 Toyota Corolla

1 Answer

Code p1131 on a 1999 mercury cougar


Lack of HO2S-11 Switch, Indicates Lean.Right bank front 02 sensor. When an HO2S sensor indicates lean at the end of a test, the system is trying to correct for an over-lean condition. The code is set when the fuel control system no longer detects switching for a calibrated amount of time.In other words the 02 sensor is indicating lean and the fuel trim has reached the programed limit trying to correct it.
There are many things that could cause this like a bad 02 sensor,a vacuum leak,a leaking or contaminated fuel injector/s,a stuck open PCV valve,leak in hose between MAF sensor and engine causing un-metered or unmeasured air entering the engine,exhaust leak,improperly seated oil dipstick,stuck EGR valve.
Check PCV valve first if it is stuck open if you pull the hose off of the valve cover that hooks to the air tube between MAF and engine you will feel a strong vacuum pull there,normal you would hardly feel it.

Mar 11, 2009 | 1999 Mercury Cougar

1 Answer

EVAP Purge control circuit code


You need a new air flow meter and air filter. Your car ir running lean, resulting in bogging issue. I am sure, that you have been using a aftermarket air filter, which is the cause of the air flow meter failure. Is the check engine light on?? if so scan it and you will most likely come up woth "fuel system lean P0171 code" Aftermarket filters are the root cause of air flow meter failure in a sentra. Let me know what you find.

Sep 08, 2008 | 2001 Nissan Sentra

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