Filled tank fri morn, afternoon car started shutting off and coming back on again while at high speed. Put stp & lucas fuel treatment thinking bad gas. Problem has gotten worse engine lite goes on, fuel gauge dropped to empty and gas tank showed up in dash first time tonight. Dealer thinks its firing relay (has not seen suv yet)????
Could be a problem with a pcm. a lot of durangos have a problem with the pcm board getting hot and cold too many times and getting a crack the size of a hair. mine did and it sent a po 505 idle air control system fault code. i diagnosed iac valve and that wasnt it then went to pem( the main computer) replaced it and has been fine ever since. but if not computer take it to a auto technician who has tools and knowledge so your not misdiagnosing things and spending lots of unnecassary money :)
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Maybe an ecu problem, my buddies F150 did this, its a sensor that has to do with the transmission, not sure if this is the same issue, it cuts fuel off, and then shuts the vehicle down, then it can randomly start depending on how the truck reads it at any given time. I can ask him further of what the issue is again....I'll get back to you.
Could be many, many things but if you just filled it up you may have a bad evaporator gas/vapor separator and that would allow gas to enter evap system when expecting gas and kill engine but it would later start again until the gas did it again moving. If just never starts again then possibly your fuel pump is failing and could be related to not working well with full tank. Other things would be computer, if crankshaft sensor is fried then car wont run at all, any sensor that shorts out can spike voltage and computer shuts down car but will usually start again but stall. Ignition coil pack could be fried, that sends power to the plugs. Bad injectors can cause a stall and no start.
It turned out the ground wire to the battery was loose, Evidently, it loosened up when driving so mimiced the earlier symptoms because it connection was sporadic. I hooked up to a computer to verify after connection tightened and it came away with no errors or problems.
Two possibles, you may have a short in the wire that acctuates the starter or your ignition switch is bad.If you want the procedure for checking these comment back and I'll respond this afternoon.As far as the stalling problem,I'm not sure,does it only do stall in a turn or stop?It's possible the baffle in the fuel tank has broke free.
If speedometer which is bouncing around, it is likely a bad ground near where the speed sensor wire harness (which connects the speed sensor to the rest of the "network") exits the transmission housing. It's at the very back of the transmission (you have a 4T60E trans) to the left of where the right side half-shaft leaves the trans housing. Just look for damaged wires. If none, replace the speed sensor for $50-60.
If it is the fuel gage, the sensor is probably not "zeroed"--it's reading wrong, too high, and if it were to start at true "empty", it would read right. Thus, the gage is always reading a little high (maybe a 1/8-1/10th of a tank too high?). This isn't a problem until to stop, start, or turn quickly and cause the fule to slosh around in the tank and starve the in-tank pickup which sends fuel to the engine.
If it is the fuel gage, you should simply put as much fuel in as you can and see if the needle goes far above "F". If it does, note how far it went and then practice filling the tank when the needle is that same distance above "E".