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
  • EXPERT
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
KFED4200
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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
KFED4200
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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
KFED4200
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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
  • EXPERT
http://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
KFED4200
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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
  • EXPERT
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
  • EXPERT
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
  • EXPERT
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
KFED4200
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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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