Check engine code

Tiny
KFED4200
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 235,000 MILES
I got my 3.8 liter 2003 impala's trouble code scannedand says running lean in banks 2 and 4 what could this mean?
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Thursday, February 3rd, 2011 AT 4:34 PM

12 Replies

Tiny
JDL
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Didn't understand your question? Banks 2 and 4? What were the actual code numbers?
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Thursday, February 3rd, 2011 AT 4:48 PM
Tiny
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Sorry I called shop and was told p0174 running lean on cylinders 2 and 4
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Thursday, February 3rd, 2011 AT 6:45 PM
Tiny
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Cars runs and idles great, fuel milage down a little and the 235000 is in kilometers not miles
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Thursday, February 3rd, 2011 AT 6:48 PM
Tiny
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For the last three months I have been getting around 350 km per tank down 150 from the 500 I use to get and all things in terms of basic tune up are up to par and maintained regularly. Thanks for your quick response!
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Thursday, February 3rd, 2011 AT 7:06 PM
Tiny
JDL
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https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers.

Did the link work? Our database didn't show a P0174 in MOD. I found the code elsewhere, it said bank two is lean, bank two should be cylinders 2--4--6. If the computer thanks the system is running lean for some reason, it will add gas.
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Thursday, February 3rd, 2011 AT 7:23 PM
Tiny
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The link says page cannot be found
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Thursday, February 3rd, 2011 AT 9:44 PM
Tiny
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Why would it run lean on two cylinders?
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Thursday, February 3rd, 2011 AT 9:48 PM
Tiny
JDL
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Sorry about that, they are still working on the site. Sometimes if you type the address into your address box and hit enter, it may work? The info is below.
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Thursday, February 3rd, 2011 AT 9:53 PM
Tiny
JDL
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It may not be running lean at all. Maybe for some reason, the computer thinks it is running lean?
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Thursday, February 3rd, 2011 AT 9:56 PM
Tiny
JDL
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Do a compression test on those two cylinders, compare to other cylinders?
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Thursday, February 3rd, 2011 AT 10:01 PM
Tiny
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ThAnks! Are there any other things that can contribute to bad gas mileage that I could also go over? Is the k & n air filter any good? Could this be the problem?
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Friday, February 4th, 2011 AT 6:46 AM
Tiny
JDL
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I'd use an oem air filter. It can use more gas with increased airflow.

Fuel injector leak-- pressure regulator leaking, where applicable. I didn't look to see if you had a returnless fuel system, no return line.
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Friday, February 4th, 2011 AT 2:52 PM

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