You either have a vacume leak or it could be the evaporative purge flow sensor. The PFS is a three-wire thermistor, with a battery voltage feed, a ground wire, and a signal wire going to the PCM.
The PFS is located between the engine and the canister purge solenoid system starts out with the PFS voltage being somewhere between 0.7v and 1.7v. Once the canister purge solenoid has been energized and there is good airflow through the system, voltage should increase by approximately 1.5v.
If not then change the purge flow sensor or valve.
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Monday, October 29th, 2007 AT 7:37 PM