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Old 06-27-2011, 10:09 PM
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think ecm problem

here's what i got its 97 camaro v6 5speed. it keeps coming up with this evap purge valve code but takes 150 miles to get this code to come up.I've replaced all the evap stuff new.I've try'd to go smog it they told me they cant get it to communicate with the smog machine.they check'd how its doin out the pipe an it was way under ca state average.idk what to do from here

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Old 06-28-2011, 10:25 AM
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Check to see if you have communication first.

When communication is restored:
Purge valves (located on manifold) are common failures.
Key on engine off should have system voltage at one wire.
With purge plugged in, backprobe control wire (opposite of power wire) and drive vehicle with voltmeter, red lead to backprobe black to ground and batter voltage should toggle. If it toggles and you have system voltage at power wire you verify powers and grounds, and it indicated purge valve issue.

Also, some scantools will allow bidirectional control of purge valve.

Why do they fail? carbon from canister becomes loose from ever fueling and age and carbon sticks in purge valve.
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