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Old 11-09-2013, 04:21 PM   #2
Tech II
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Re: Blazer secondary air pump

I don't think you can......

The VCM commands the air pump on, at startup on a cold engine(length of time on, depends on coolant temp)........when the isolator valve opens up, this sends air into the exhaust, which should make the reading lean on the O2 sensor.......if the VCM does not see the exhaust go lean(on a cold engine on startup, the exhaust will be rich), it sets the code.....no way around this one....
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