jcal454

I have a service engine light coming on, had it scanned and the codes read ftp sol. (fule tank pressure) or canister purge sol. Any one have any advice on this? I think canister purge is part of the EVAP sys. Any help would be great with the location of these items on the car.

Injuneer

The EVAP purge solenoid is on a bracket on the passenger side of the intake manifold. Do you have the exact number for the code? Sounds like its the one that sets for the electrical circuit on the EVAP purge solenoid, but it would be better to have the exact code.

If its the electrical code, the solenoid may be disconnected, or the solenoid could have an internal short of open. Measure the resistance of the solenoid (harness disconnected).

Courtesy of Shoebox:

http://shbox.com/1/evap_sol.jpg

jcal454

Thanks, I'll check the resistance, assuming it should be open when disconnected? The codes were..........aa1,aa2........had them done at auto zone. On the top of the print out the number reads P1441. Probable causes read, aa1, aa2, failed canister purge sol, failed fuel tank pressure sensor.
Thanks for the info...................

Injuneer

The "Code" is P1441 - EVAP Vacuum Switch Circuit High During Non-Purge

Tha "aa1" etc are attempts to suggest POSSIBLE causes. If its a problem with the solenoid, its a mechanical problem (solenoid stuck open), not an electrical problem with the solenoid. If it had been an electrical problem with the solenoid, you either would have got "0" ohms (short circuit in solenoid) or infinite ohms (open circuit in solenoid). You should always see resistance in the solenoid, because you are measuring the electric coil that actuates the solenoid.

Solenoid could be stuck open because a piece of charcoal from the canister has jammed it. Could be a problem with the vacuum detection switch (see part # 11 in Shoebox's diagram):

http://shbox.com/1/1996_evap.jpg

Could be due to the two hoses on the solenoid being switched to the wrong positions.

Check to see that the hoses are connected correctly. Take the solenoid off and blow through it. If you can blow through it, its stuck open. Might be able to clear it out with high pressure air. If its got charcoal in it, check the line from the canister to the solenoid, because it may indicate the canister charcoal is breaking up and filling the hoses.

jcal454

Thanks........will check it out this weekend. This is my son's car. I'm not up on all the emission stuff. My 68 is so much easier to work on.
Thanks again for the info..............