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2000 Chevy Silverado Lean bank 1 code

Tiny
BIGDAWGS2001
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 124,000 MILES
I have checked my truck all over for vacuum leaks. I noticed while looking for vacuum leaks, one of the exhaust manifold bolts was broken flush with block. It looks as if it had been that way for a whileand not fresh break. The gasket and manifold is not loose. Is there a chance this is giving me the service engine light and lean bank 1 code?
The light had just came on within the last 3 days.
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Friday, October 16th, 2009 AT 11:04 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Saturday, October 17th, 2009 AT 7:30 AM
Tiny
QUAGMIRE86
  • MECHANIC
  • 98 POSTS
I don't think having a broken exhaust manifold bolt is going to give you a code (I have broken bolts on mine, 1 on one side and 2 broken on the other). Never been a problem. No, I didn't break them. They were like that when I bought it. :)
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Saturday, October 17th, 2009 AT 9:56 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
It's also possible if it's a lack of switching code, that the sensor is no good, these are designed for 100,000 miles, you are above that. P1153?
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Sunday, October 18th, 2009 AT 8:45 AM

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