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2000 Deville 174/171 codes

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Old May 2, 2011 | 01:53 PM
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garretthes's Avatar
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Joined: Oct 2007
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Default 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?
 
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Old May 2, 2011 | 08:21 PM
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gmtechs's Avatar
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Joined: Aug 2010
Posts: 239
From: Ontario
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r your o2 sensors working
r there any engine noise in vehicle
did u check vacuum lines for cracks
 
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