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Ladies and gentlemen I have a 2002 ram 1500. 5.9 magnum V8. If you've already replaced your sensors as in cam aka pickup coil located in distributor and crank stop there. Reason why is 1 question. Did you replace your transmission. If yes let's talk about the flex plate. If it has the slightest bend then that's the problem. Some aftermarket crank sensors can be too long. You tighten it down and couldn't tell. I've dumped thousands into mine. Low compression cracked heads. I bought new heads timing gears and chain distributor spark plugs wires lifters and rods. So all that for a 20$ flexplate. As soon as I replaced it started the truck instant fix. No rough idle smooth as can be.
Code P1391 Loss of crank or cam sensors,P0340 No cam signal at the pcm. I
would replace the crank sensor first. Your cam sensor is part of the
dist. on 5.2/5.9 engines. Hope that helps.
had similar problem with 99 ram. i made holes in crank sensor a bit bigger,removed rubber seal that sensor goes through in trans,installed 1 bolt and adjusted sensor back towards firewall and tightened that 1 bolt and its worked fine ever since
Change cam sensor & erase codes.( disconnect battery for a minute or so after.) 340 & 1391 refer to cam sensor problem, and all other 300 codes are cylinder misfires that should disappear when cam sensor fixed.
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