2004 Chevy Truck check engine lite on

2004 CHEVROLET TRUCK
160,000 MILES • V8 • 2WD • AUTOMATIC
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MIKETECH
  • MEMBER
  • 1 POST
truck runs poor intermittently map sensor dtc poor economy, replaced map sensor and both upstream o2 sensors problem still persists
Sep 18, 2009 at 12:24 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Could be caused by the following: Worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Sep 18, 2009 at 4:07 PM
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