2000 Deville 174/171 codes

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05-02-2011, 01:53 PM

garretthes

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Join Date: Oct 2007

Posts: 3

2000 Deville 174/171 codes

I have consistent 174 and 171 codes on my DHS. It has 198k. I sprayed carb cleaner all around the intake and plenum with NO change in rpm. What's next?

05-02-2011, 08:21 PM

gmtechs

Senior Member

Join Date: Aug 2010

Location: Ontario

Posts: 239

r your o2 sensors working
r there any engine noise in vehicle
did u check vacuum lines for cracks

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