CEL p0440 back on after gas cap replacement

[nocturnalVX]

My VX has that code constantly popping up, and a couple of mechanics have found nothing wrong with the evap system. The theory is that there is an electrical gremlin causing the trouble code, but I have not had time or $$$ to chase it down. I tried being sneaky and clearing the code a day before getting the VX tested, but (even though it didn't "fail") it did not successfully get through the testing... I brought the VX in to my mechanic near the testing facility, and he got it passed. However, 0440 reared it's ugly head again soon after. Good luck!

[deermagnet]

EVAP problems are a real pain. I could be so many things that it's hard to pin it down. The system detects very small leaks that could be anywhere. An Isuzu mechanic with the Tech2 scan tool is the best way to find problems.



I have an Isuzu tech video for EVAP concerns that may give you a headache when you see how this system works. The P0440 code is mentioned in the vid. I believe you need a RealPlayer to view it.


23.2 MB, 12:58 - http://www.drivehq.com/file/df.aspx/publish/mgpa/techvids/evap.rm

Mark Griffin