HOW TO: Replace Purge Solenoid Valve - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 47 (permalink) Old 11-29-2010, 10:39 PM Thread Starter
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HOW TO: Replace Purge Solenoid Valve

Here's a guide to replacing a purge solenoid valve (on a 2004 Mazda 3).

Correct part number is LF66-18-74X:
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post #2 of 47 (permalink) Old 11-29-2010, 10:40 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 1: Disconnect negative terminal of battery:
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post #3 of 47 (permalink) Old 11-29-2010, 10:43 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 2: Disconnect the wire clip from the solenoid valve:
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post #4 of 47 (permalink) Old 11-29-2010, 10:48 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 3: Disconnect this fitting near the firewall with the quick-release connector:
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post #5 of 47 (permalink) Old 11-29-2010, 10:49 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 4: Disconnect this fitting from the front of the engine:
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post #6 of 47 (permalink) Old 11-29-2010, 10:52 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 5: Slide the solenoid valve towards the front of the car to release it from the rubber fitting that holds it in place:
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post #7 of 47 (permalink) Old 11-29-2010, 10:55 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 6: Loosen the hose clamp connecting the line from the firewall to the solenoid valve, and remove old valve (which remains connected to the front line).
Step 7: Connect quick-release clamp of new front line to the front of engine (simply snaps on).
Step 8: Reconnect the rear line to the new solenoid valve and tighten hose clamp. Make sure the raised line of plastic on the valve is lined up with the marked line on the rear hose, and slide the solenoid valve back into the rubber fitting:
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post #8 of 47 (permalink) Old 11-29-2010, 10:58 PM Thread Starter
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Re: How to replace purge solenoid valve

Step 9: Snap rear line back onto the fitting coming from the firewall.
Step 10: Reconnect wire clip and battery cable:
Step 11: Done!
Step 12: Don't forget to remove this plug from the new front line before trying to connect it :
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post #9 of 47 (permalink) Old 01-05-2011, 12:29 AM
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Re: HOW TO: Replace Purge Solenoid Valve

Nice wright up. Question how do you know if this needs to be changed out

Zoom Zoom speed3
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post #10 of 47 (permalink) Old 01-05-2011, 07:42 AM Thread Starter
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Re: HOW TO: Replace Purge Solenoid Valve

Check engine light will come on, will rough idle, and hard start-up after fueling up.
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