2008 Grand Caravan SXT – 2 problems (starting and U0126)

[scherp]

I have 2008 Grand Caravan SXT with 3.8 liter engine. Starting this summer an intermittent long crank time presented itself and now a misfire is being reported on cylinder 1. Long crank time mostly happens in the morning and misfire goes away after driving a few seconds and run fine. If the temp is 20 degrees or lower the misfire does happen as often.

I have check the fuel pump relay and that tested good.

I have finally did a fuel pressure test. I connected the pressure gauge before the fuel rail.

Initial pressure 55 and 59 (ran pressure test twice)
Leak down: in 5 minutes pressure drop to 30 and 32
in 15 minutes pressure drop to 10 and 12
pressure was still dropping after 15 minutes, I just stopped the test.

Does the pressure test indicate a bad return valve on pump or something else?


Thank you for your help.