New to the forum hoping i can find some help on here. Ok so im at a loss. i have a 1999 ram 1500 sport 5.2 auto. it started throwing this code coupled with multiple symptoms.
what it is doing
it runs fine, idles fine then randomly decides the idle is going to surge and drop, it will stall, it becomes gutless, the more throttle you give it the worse it gets, sometimes coupled with what sounds like the rotor shooting spark in the wrong place in the cap. it will backfire and buck. but it Does not do it all the time. which leads me to believe its not timing or distributor related.


i have replaced the pick up coil, crank sensor, pigtails to both sensors, alternator, battery, coil, pcm, not related but all throttle body sensors are new as well. plugs are new and properly gapped, cap, rotor and wires were replaced not long ago. i have done the jiggle test on darn near every connection under the hood. replaced all the ground cables. And fuel pressure stayed a constant 45 even while the idle was loping and when it stalled im lost i have no idea where to go next.

 

Does it do it every time it warms up, or intermittently?

What brand sensors did you put in, especially the cam and crank? These trucks don't like any major aftermart sensors, just the oem mopar sensors.

 

It doesnt seem to matter as far as what the temp or how long ive been driving it. i used bwd sensors from advance i will go to dodge tomorrow to get their sensors and try that. thank you!!!

 

Still have a P1391 after all the parts? Then you may need to be thinking about the timing chain. Maybe even a cracked flex plate.

 

How's your plenum gasket?

 

Yea its still there. im gonna try a mopar pick up coil and crank today. all the gaskets in the truck were new about 20-25k ago when i did the head gaskets. i steered away from timing because its intermittent. figured timing would be a consistent thing. she is approaching 300k so guess some stretch in the chain isnt out of the question. i didnt think about the flex plate. my buddies r/t dak made a helluva racket when his went though i dont have anything that sounds that deathly.

 

At 300K, your timing chain is WELL past its usable life. Mine was stretched out considerably at just 168K...... I recommend changing out the stock style chain on motors that are over 100K..... and you are quite a ways past that.

 

Well the mopar sensors did not help. same random problems. i tried to check for slop in the timing by having my friend move the crank back and forth while i had my hand on the distributor rotor stem to see if i felt any play but it was very very little. not sure if that was enough to cause it to throw bad codes did the same test on my dak had pretty much the same amount and she purrs like a kitten.

 

Have you checked the connectors at the PCM?

 

Well ive wiggle them while it was running trying to get it to mess up. and with it off gave the each individual wire a little tug mothing seemed. loose