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Check engine light

Tiny
PROMETHIUS
  • MEMBER
  • 2004 CHEVROLET EPICA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 42,000 MILES
My chevy epica will not pass emissions testing due to po171/174 error codes many people have suggested a vacuum leak could be the cause the frame by frame report showed 11.25 hg at the map is this normal
Sunday, June 12th, 2011 AT 7:58 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, that should be up around 16 to 18. It appears to be losing vacuum somewhere.
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Sunday, June 12th, 2011 AT 9:06 PM
Tiny
PROMETHIUS
  • MEMBER
  • 4 POSTS
I have replaced the pcv valve, ihave tested the vacuum with a gauge and read in the green, ihave also sprayed maf sensor cleaner everywhere with no change in rpm, I did a second scan today and the coolant temp read 107.60f identical to the previous scan and I made sure that the engine got up to temperatureanc the coolant was circulating
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Sunday, June 12th, 2011 AT 9:57 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Sounds like you need some professional help.
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Sunday, June 12th, 2011 AT 10:04 PM

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