Having problems with your 2005 Chevrolet Cobalt ?

The "Check Engine" light on my 2005 Chevrolet Cobalt stays on after the other diagnostic and warning ligths go out after cranking the engine. It glows steadily rather than flashing. I took it to Pep Boys for diagnosis, and they advised that the fuel/air mixture is running lean, and showed me the codes they pulled so that I could verify that they had in fact run the diagnostics. They also stated that they could find nothing else wrong (e.g. faulty oxygen sensors). They offered to perform their

Posted / edited by AnonymousUser on : 01-06-2020

Answers :

Hello ellington.
Hard to say definitively you have been ripped off but in my opinion they did not get to the actual problem. If they had the light should have not returned.
I have been fixing cars for a good many years and specialize in issues like yours.
I do not advocate injector cleaning unless absolutely necessary.
A lean running problem can be caused in several ways.
A vacuum leak, manifold pressure sensors, airflow sensors, low fuel pressure, oxygen sensors, engine problems being the first to come to mind.
A technician that is able to read the data that is coming out of the computer will analyze the information, know what is and isn't proper and come to a solution.
There may be other factors that come into the mix as well, basic ignition and engine problems that are sometimes overlooked.
Not always easy to figure but in most cases you can locate the source of the problem.

Now to assist you on the second question.
If there are no driveability issues such as bucking, surging, pinging, backfires and so forth you more than likely will be fine for a while.
Might as well give them a chance for it to work, although unlikely.

If you have further questions please leave them for me in "add comments" and I will return to answer you.

Coolant sensors have an effect on the rich/lean burning of the engine,also mass air flow sensors,and throttle position sensor.The fuel ratio depends on a lot of different things.But the concern can be alarming in fact,if the system continues to lean,the exhaust manifolds,can start glowing red,and cause problems ,such as a fire.First thing to have check is the fuel pressure,and then the fuel pressure regulator.Unless contaminated fuel has entered the fuel injection,I would see no reason for the fuel system clean,though it is good for the system.O2 sensors,and other sensors calibrate the mixture,of fuel,and air.You might have the e g r ,checked to make sure it is not stuck open,or is being opened all the time.Look for vacuum leaks.If a spark plug is removed,and inspected,then it should be white as snow on the electrobe..I do not have anything against this company,and do not know there reputation,but I still would take it to a shop of good reputation,for doing diagnoses on computer trouble shooting,Dealer ships are a little expensive,but they will have the know how to figure this problem out.Like I said,this can cause a fire if it is actually a lean burn situation.
Repair Help & Product Troubleshooting for 2005 Chevrolet Cobalt

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