1996 GMC Jimmy DTCs P0440,P0507

Dave-Brinston · Posted at Sat Oct 04, 2008 10:22 am

Engine Performance problem
1996 GMC Jimmy 6 cyl Four Wheel Drive Automatic 256843 miles

There are three oxygen sensors on the exhaust,how do I test to see which one needs replacement.Or is there another solution to these codes?P0440,P0507

SWilliams · Posted at Mon Oct 13, 2008 5:23 pm

P0440 is an EVAP failure code.

P0507 is an idle control system, idle higher than expected.

With the two of these together it sounds like the front purge solenoid on the intake manifold is leaking and causing a vacuum leak through the EVAP system. It is a simple bolt on part that costs about 20 bucks. Two bolts to remove it and a clip that retains the vacuum line to the EVAP line. It could also be a larger vacuum leak though. Look for broken lines or listen for the leak as well when you test the solenoid valve.