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I have a 2005 Wrangler Rocky Mountain Edition. I recently installed a rebuilt motor, clutch, heater core, and transfer case. My previous motor was destroyed by a faulty Oil Pump drive. Everything is working well now except that first thing in the morning it throws a P0340 immediately upon starting from cold. I'm in Colorado so the morning lately have been below freezing.
While the CEL is on the Jeep drives ok but in "limp mode" (cut off at higher revs). The strange thing is that as soon as the engine reaches operating temp I can clear the code using my reader and it stays clear all day. On one morning when it was unseasonably warm overnight I started the morning without the code at all but for the most part it returns faithfully each morning.
I have replaced the plugs, the camshaft position sensor (twice), and the crankshaft position sensor. I've checked the ground connection at both sensors and the speedo sensor and it seems strong. What could possibly cause this code to appear every morning? As I understand it, the camshaft position sensor isn't even used until the Jepp is warm and in "closed loop" operation. Any ideas?
While the CEL is on the Jeep drives ok but in "limp mode" (cut off at higher revs). The strange thing is that as soon as the engine reaches operating temp I can clear the code using my reader and it stays clear all day. On one morning when it was unseasonably warm overnight I started the morning without the code at all but for the most part it returns faithfully each morning.
I have replaced the plugs, the camshaft position sensor (twice), and the crankshaft position sensor. I've checked the ground connection at both sensors and the speedo sensor and it seems strong. What could possibly cause this code to appear every morning? As I understand it, the camshaft position sensor isn't even used until the Jepp is warm and in "closed loop" operation. Any ideas?