I just recently acquired a 2006 4 cyl manual extended cab work truck with less than 30,000 miles on it. It runs great but the check engine code associated with valve timing keeps coming on and occasionally it switches itself off. I've replaced all the sensors only to have it come on again and then shut itself off again.
I'm not about to invest any more money until I get a reasonable diagnosis of what is causing it to happen. My mechanic has done all the computer based testing he can and gives the motor a good bill of health except for the fact that it doesn't seem to like the valve timing it sees sometimes right when I start the motor. Once it is running, according to the shop, everything is working as designed.
Any suggestions?
