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2003 Chevy Impala check engine light / emissions

Tiny
SHAOLIN_SHADOWBOXER
  • MEMBER
  • 2003 CHEVROLET IMPALA
Engine Performance problem
2003 Chevy Impala 6 cyl Two Wheel Drive Automatic

what can cause the check engine light to stay on. Code p0171 (to lean). I changed the fuel filter, and the oxygen sensor, and check the vacuum lines for leaks (none). Fuel pump is okay. What else can be done? Where is the egr located? How to clean it or replace it?
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Wednesday, May 14th, 2008 AT 7:39 PM

4 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
You need to check the fuel pressure and double check for vacuum leaks.
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Wednesday, May 14th, 2008 AT 7:46 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Yes fuel pressure, you may just need a regulator. Here is a video to show you how to do it if you don't know how:

also one more thing, pressure test your gas cap too, that will make your check engine light come on and cause a lean code. Ahaaaa
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Wednesday, May 14th, 2008 AT 11:19 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
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Wednesday, May 14th, 2008 AT 11:20 PM
Tiny
KWIESMORE
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  • 4 POSTS
Try replacing your gas cap. Mine was cracked and made the check engine light come on. A new one was $12 and it's fine now.
Good luck!
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Friday, May 16th, 2008 AT 9:43 AM

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