Help with 2002 V6 Coupe & PO455 code - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 02-18-2011 Thread Starter
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Help with 2002 V6 Coupe & PO455 code

My 2002 3.8L V6 Coupe's Service Engine Soon light is on and also the Check Fuel Cap light is on. The code that was given was a PO455 (gross evap leak). I tried a new fuel cap, as my stock cap was pretty worn out. I reset the battery, but about 120 miles later the Service Engine Soon light comes on and another 50 miles or so, the Fuel Cap light comes back on. I assumed that because of the GROSS evap leak (as opposed to a small leak) that it was something larger than just the fuel cap, but I never smell gasoline or anything. Is my next step the fog machine to find the leak?

Thanks in advance for any help or just reaffirming my denial.

Eryn

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post #2 of 4 (permalink) Old 02-18-2011
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It is probably the vent solenoid, but I would have it properly troubleshot before throwing parts at it. The evap circuit needs to check out electrically first before smoke testing.


1988 Mustang LX coupe will miss you greatly
traded for:
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post #3 of 4 (permalink) Old 02-18-2011 Thread Starter
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If it was the vent solenoid curcuit, wouldn't it throw the appropriate code for that issue? *Sigh* Alright. Back to the shop.
Thanks!
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post #4 of 4 (permalink) Old 02-19-2011
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The EVAP system can be a downright pain in the a$$ to diagnose properly. The codes can be misleading and you gotta really do proper troubleshooting to get it nailed the first time. All manufacturers use different codes for different faults yet the OBD2 codes are standardized so one code can mean something else on a different car.

As for the gross leak code, as I said, most of the time it is because the vent solenoid is stuck or broken. Many times, it will still report correct voltages to the ECM/PCM so it will not cause the CEL. But, when the car does it's self diagnostic test on the EVAP system, it will not be able to pressurize the system so it reports a gross leak. A leaking gas cap almost never reports as a gross leak as well.

Technically, you REALLY need a bi-directional scanner and a smoke machine to work on the EVAP system. The scan tool can force the EVAP test and cycle the solenoids so you can in it down there if that is the problem. If everything works then you know you need the smoke machine and test for leaks. Also, even if the scan tool cannot force the solenoid to function you still gotta check the wiring to be sure there are no breaks in the wires to the solenoid.

I've been a mechanic for 20+ years and if there is one system that is really annoying to work on it is the EVAP.

1988 Mustang LX coupe will miss you greatly
traded for:
2004 Mazda 6s 5 door Sport w/5spd/3.0/RX8wheels/Kon/Eibach/and then some

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2002 ford mustang , check fuel cap , gross evap leak , po455 , service engine soon

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