hello, i have a 03 Ram 1500 with the 3.7L that recently started giving me some trouble. a few weeks ago driving home with no warning the truck shut off? rolled to a stop and started right back up, no check engine light. put it in gear got about 15 feet and started jumping like a horse...wth! i have to 2 foot it home all the way keeping the rpm's up. so i started with the normal things, TPS sensor, idle air valve, changed the TB gasket, the cam sensor and yes the fuel pump and regulator. so today i finished the pump put some fresh gas in it and fired her up it ran great for 10 mins and fell on its face with no warning, no check engine light no nothing has anyone had or heard of this issue?
thanks

 

Sounds like a crank sensor to me, they can be affected by heat, and are of course affected by rpm, the lower it goes, the harder the sensor needs to work to get a reading. Could also be rust behind the sensor causing to to move away from the tone wheel, will cause a stall at idle.

 

yes of course the only sensor i didn't change. i was figuring that one needs changed too. trucks got 187K and looks like everything is factory. i'll pick one up and give it a try and post back results. thanks for the input

 

well changed the crank sensor with same results, runs great for 10 min and shuts down? this truck is pretty bare bones no power windows or auto daytime running lights but for some reason I have a light that keeps flashing for lamp out? it was during the day and I didn't turn the lights on at all, all the lights work fine. is this just an issue not related to the truck shutting off or is it trying to tell me something. I still have no check engine light on at all.

 

turn the key to run (don't start) and off 2 times, and back to on for the 3rd time and look at the odometer. See if any codes are displayed. Should start with a P followed by some #'s, if there are codes present. It will display PDone if no codes.


SJ03

 

yep tried that too, no codes. truck starts fine, runs awesome and after roughly 10 mins shuts itself off, once in a while maybe every 3rd or 4th time the truck shuts off the idle jumps up and down..clears up for a min then dies.

 

PCV Valve? I don't know if there is a fuel filter or not. Check the plugs?


SJ03

 

forgot to add in the list of things changed the PCV valve was changed as well. the fuel filter i assumed way part of the sending unit/regulator. i asked at the part store if truck has a fuel filter but they couldn't find a listing for it. looks like me and buddy OHMs meter is doing some wire fishing.

 

ok gotta another question, i noticed a box in front of the fuel tank that has a series of hoses and what looks like a pump? i am assuming it has something to do with the fuel delivery system? there is what really looks to me like a filter, it says filter on it does anyone know what this is? i know Dodge doesn't always use an in-line filter but this really looks like a fuel filter.

 

Evap canister. What is causing the truck to shut down. Loss of fuel, spark?