Pontiac Problems? Ask a Mechanic for Answers ASAP
This is very common on many cars.
First thing to check is the gas cap.
The seal can harden with age and use, and it might not seal well enough at the filler neck.
Or it could have a weeping pressure vacuum valve.
You can apply a smear of rubber grease to the seal and see how well it makes contact to the filler neck.
Then if the cap is the cause, replace the cap first.
The evap purge solenoid is usually the next cause.
Can you try as I have suggested above with your gas cap?
Yes i will try that then I will jump out the evap purge solenoid if I undo the connector and put jumper wires postive to one side and negative to the other side I should hear the solenoid open and close right? Instead of changing it I can check it that way?
I would listen to the solenoid while the engine is running.
It should be ticking like an injector.
Then I would measure it's resistance.
Typically about 20 ohms.
It may be a 5 volt circuit, so until we get a circuit, I would not put 12 volts across it.
Ok thank you very much
Where would I get 5 volts from could I use a 9 volt battary? Or should I just measure Ohms?
Can you measure ohms first and come to back to me?
Yes thanks alot??
It should be switched 12 volt from the PCM, so you could test the solenoid with 12 volts.
What resistance does the solenoid measure?
Another trick you can try is to take the solenoid away from the engine, cap the fittings, and run the engine. If the code doesn't reoccur, then start introducing each part of the system. This can work if the code comes up quickly.
I checked the purge valve soleniod and read through the connect for power 11.96 volts and 21 OHMS through the soleniod. Just cant tell if its opening and closing with the engine noise and the supercharger noise cant hear nothing opening or closing through the purge valve. How would I see if it is the once thats done I can move on to the next thing if its good or bad?
With the hose off the solenoid, you should hear a vacum leak through the solenoid with the engine running.
Ok thank will try..
Have you had any luck yet?
Yes I checked the purge valve soleniod and its working what next? My ODB2 Is telling me I have a Small EVAP Leak? Code PO442
Did you try as I mentioned on 2nd December?
Does the code still set then?
Yes I tired that aslo and still saying po442