Not caused by alternator. check the idle air control motor operation (take it off and see if it moves when the key is turned on. also clean out the air passages while you have the motor out) and clean the throttle body with carb cleaner. I have pasted some info on the EVAP purge valve--it may be operating normally. Is your engine light on? If yes, can you get a free scan at your local parts chain and send us the trouble codes?
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The IAC motor is located on the throttle body.
- Remove air duct and air resonator box at throttle body.
Evaporative Emission Purge Solenoid
Description & Operation
The duty cycle EVAP canister purge solenoid (DCP) regulates the rate of vapor flow from the EVAP canister to the intake manifold. The Powertrain Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The PCM de-energizes the solenoid during open loop operation.
The engine enters closed loop operation after it reaches a specified temperature and the time delay ends. During closed loop operation, the PCM cycles (energizes and de-energizes) the solenoid 5 or 10 times per second, depending upon operating conditions. The PCM varies the vapor flow rate by changing solenoid pulse width. Pulse width is the amount of time that the solenoid is energized. The PCM adjusts solenoid pulse width based on engine operating condition.
johnjohn2 thanks for info completed solution . same problem , ? i have voltage meter ,need to check connection at harness . what should i be looking for [email protected] , ? might be engine manegement system problem .
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