Question about 2002 Saturn VUE
SERVICE ENGINE LITE COMES ON --OBD2 METER READS ENGINE TOO LEAN ---WHAT IS CAUSE?
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.
Posted on May 30, 2010
Testimonial: "THANK YOU SO MUCH ,MY MECHANIC FEELS ITS A HEAD LEAK OR A HOSE CLAMP NOT TIGHTENED.HOWEVER I FEEL ITS A FUEL FILTER.THIS WAS VERY HELPFULL.THANK YOU"
If yours is a v6 . remove the top of the intake and check the screws on the vac. chamber . If loose it can cause air to leak inside of the intake . I just bought 1 of these and it had p0171 and p0174 codes for bank 1 and 2 being too lean . I checked mine and half of the screws were loose . There is a service bulletin on this that I found . GM has some springs available to help hold it down . I just resealed and tightened mine and so far so good.
Posted on Jun 06, 2010
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Posted on Jan 02, 2017
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When the service engine soon light a yellow light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.
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