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The Purge is controlled by the PCM with a pulse width modulated switch signal. It is normal for it to cycle rapidly. This allows small amounts of the fuel vapor to be metered into the cylinders. This method allows the system maintain fuel control. One of the main jobs of the evaporative control system purge valve is to maintain a slight negative pressure ...


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Don't know if this helps; best I could find...


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Well there was a vacuum leak. Plain and simple logic dictates a drop in fuel efficient performance as the gases are not being recycled as the Evap system would when it's running without leaks at optimal efficiency. The moment you ran the test and fixed it, your problem vanished. Now the theory with the check engine light is accurate in your case as it ...


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It's under the hood on the right side of engine compartment. Unplug the connector, figure out which side is the computer controlled ground. Backprobe the ground wire. put a vacuum pump on it and ground the solenoid. Do this when the engine is hot and do it several times. Check per tsb ntb05-053 as well. It covers harness rub through by the wiper motor ...


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The air taken into the engine from the charcoal canister via the purge valve will be saturated with fuel vapors. The engine ECU will not be expecting this, so the engine will run rich. You would expect the fuel trim to be out.


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