CHECK ENGINE LIGHT

2004 Chevrolet Epica

Tiny

promethius

June, 12, 2011 AT 7:58 PM

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

FOUND 16891 RELATED QUESTIONS

3 Answers

Tiny

Wrenchtech

June, 12, 2011 AT 9:06 PM

No, that should be up around 16 to 18. It appears to be losing vacuum somewhere.

Tiny

promethius

June, 12, 2011 AT 9:57 PM

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

Tiny

Wrenchtech

June, 12, 2011 AT 10:04 PM

Sounds like you need some professional help.

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