2004 Chevy Truck check engine lite on

Tiny
MIKETECH
  • MEMBER
  • 2004 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Truck runs poor intermittently map sensor dtc poor economy, replaced map sensor and both upstream o2 sensors problem still persists
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Friday, September 18th, 2009 AT 12:24 PM

1 Reply

Tiny
2CEXPT
  • MEMBER
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.
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Friday, September 18th, 2009 AT 4:07 PM

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