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2008 Chevrolet Silverado P0174, P0300

Tiny
MWHITNEY2007
  • MEMBER
  • 2008 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 121,005 MILES
Truck was dropped off with check engine light concern. Pulled codes and found all cylinders mis-firing one time or another. Replaced plugs with ac delco, cleared codes and test drove. Engine light came on after it started to flash while going down the road, and the traction control light also on. After light stops flashing the traction control light goes out and check engine stays on. Code p0174, p0300 are stored in pcm. Misfire counter never sees a misfire. With a lean code on only one bank I swapped upstream O2 sensor from bank to bank and code still comes back with bank 2 lean. Any help would be great. Thanks
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Monday, December 16th, 2013 AT 2:01 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Since you are getting a lean code, have you checked for vacuum leaks and the intake gasket?
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Monday, December 16th, 2013 AT 5:58 PM
Tiny
MWHITNEY2007
  • MEMBER
  • 3 POSTS
I have tried brake cleaner and map gas and no leak was detected. Tried to smoke the intake and could not get it to seal completely up. I did hear an exhaust leak t his morning when a lube tech moved it. So I going to check that out shortly.
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Tuesday, December 17th, 2013 AT 6:09 AM

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