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2003 GMC Sierra Check engine light is on.

Tiny
THORNDORF
  • MEMBER
  • 2003 GMC SIERRA
Engine Performance problem
2003 GMC Sierra V8 Two Wheel Drive Automatic 110K miles

My check eng. Light is on and I went to Autozone and they put a code reader on the truck and it read a problem with the evaporator system. The read-out said it could be the canister, the gas cap, a hose, or a vaccum leak. Everything looked good but before I start tearing out the intake manifold to reseal it I was wondering if you had a better idea.
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Thursday, June 4th, 2009 AT 1:40 PM

2 Replies

Tiny
RTHULL
  • MEMBER
  • 3 POSTS
You may still have to remove the manifold but it also could be your knock sensors. I have a similar problem about a year ago.
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Thursday, June 11th, 2009 AT 4:02 PM
Tiny
ED_12ROD
  • MEMBER
  • 12 POSTS
It could be that your oxygen sensor could be dirty. Does it come on for while then turns off.
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Friday, August 7th, 2009 AT 9:15 AM

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