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2004 Chevy Trailblazer VACUM LEAK / CHECK ENGINE LIGHT

Tiny
NYRECONMARINES
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • V8
  • 4WD
  • AUTOMATIC
  • 131,405 MILES
I have this check engine light issue from hell. Did a scan tool code check found to be a large leak. Checking on Trailvoy. Com fourm found it's a common issue with the gas cap. I replaced the gas cap and a the EVAP vent valve/ control solenoid.

I ordered the EVAP purge valve & both O2 sensors. Any help would be great.
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Tuesday, November 10th, 2009 AT 2:08 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
First you need to see what the code was. Not just replacing parts. If you have a gas cap code you shold hear 3 clicks after you tighten it. Any small vacuum leak will be taken care of by the computer. If it is a large leak you should be physically able to see a loose or soft/worn hose. If it's your purge valve then clamp a pair of vise grips to the vacuum line to see if that takes care of it. If it does then that will tell you it's that part. Make sure you know what the code is before doing any repairs.
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Wednesday, November 18th, 2009 AT 6:20 PM

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