Went into get a hair cut, came out and my Jeep started running at a high rpm's and was throwing three error codes; P1391, P0171, and P0340. I bought a new Camshaft Position Sensor and installed it, I also did a visual inspection of all the wires, tubes, and springs related to the problems, and I ran 1/3 of a bottle of Sea foam through the engine. After that I cleared the codes and went for a drive to burn out the rest of the Sea foam. On the drive the P0340 came back up and the high rpm's returned. I have checked the wiring and, as far as I can tell, none of my vacuum lines are broken. I did not remove the lines, just visually inspected and ran my fingers over them to feel for abnormal imperfections. I am at a loss because the P0340 is suppose to get you a rough idle, not the high rpm's. So currently, with my foot off the clutch and gas, I can idle my car along in third gear at twenty five mph.
Sep 13, 2016 at 4:25 PM