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Old 09-14-2010, 05:21 PM   #1
Blue71LWB
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Join Date: Nov 2006
Location: Alabama
Posts: 120
Does 85 GMC 305 have O2 sensor ?

I have searched , but have found conflicting answers.
A friend has a 85 GMC that's running super rich all of a sudden. It has the electronic quadrajet , but does this mean it will have an O2 sensor? I'm his mechanic by default since I sold him the ride.

Also what does the ported vacuum swith on top of the thermo housing control ?

Any help is appriciated.
Zac
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