Greetings
I've been struggling to get my Jeep back up and on the road. The biggest challenge has been figuring out what is causing the P0442 code - been chasing this for a couple months now..... I've read many of the threads on this code have followed much of the advice that I've read - without success. I have a 97 TJ with 4.0 that started throwing this code awhile ago. The purge valve solenoid has been replaced as has the charcoal cannister, most of the vacuum hose, and the gas cap (with a Mopar cap). All the lines under the hood and back to the tank have been smoke tested. I even dropped the tank and replaced almost all rubber hoses. When I smoke tested the lines going back to the tank there were no leaks and when the gas cap was removed there was a big rush of air/smoke so I know it was had a pretty good amount of pressure. The CEL comes back on after being reset. The one thing I'm suspicious of is that I can't feel the purge valve solenoid cycle.... and I don't measure any voltage there - but I'm not sure what I should see - is it simply 12V DC and how long does that valve open for or does it cycle? Any help you can provide would be greatly appreciated. Haven't been able to get it emissions tested with the CEL and being in the Phoenix area there is no waiver no matter how much you spend to get it fixed ............
Thank you for your help..........
Bart
I've been struggling to get my Jeep back up and on the road. The biggest challenge has been figuring out what is causing the P0442 code - been chasing this for a couple months now..... I've read many of the threads on this code have followed much of the advice that I've read - without success. I have a 97 TJ with 4.0 that started throwing this code awhile ago. The purge valve solenoid has been replaced as has the charcoal cannister, most of the vacuum hose, and the gas cap (with a Mopar cap). All the lines under the hood and back to the tank have been smoke tested. I even dropped the tank and replaced almost all rubber hoses. When I smoke tested the lines going back to the tank there were no leaks and when the gas cap was removed there was a big rush of air/smoke so I know it was had a pretty good amount of pressure. The CEL comes back on after being reset. The one thing I'm suspicious of is that I can't feel the purge valve solenoid cycle.... and I don't measure any voltage there - but I'm not sure what I should see - is it simply 12V DC and how long does that valve open for or does it cycle? Any help you can provide would be greatly appreciated. Haven't been able to get it emissions tested with the CEL and being in the Phoenix area there is no waiver no matter how much you spend to get it fixed ............
Thank you for your help..........Bart
