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2003 7.3 P1316 ran great then died and will only crank
2003 7.3 has run like a clock since I bought it 2+ years ago, it is an occasional use vehicle. A couple of weeks ago at near the end of a one hour drive, the truck momentarily stalled (maybe a stumble but restarted while decelerating from about 40 mph, SES/CEL light came on for a second then everything went back to normal. A minute or so later while stopped at a red light the truck just shut off (SES/CEL on at the instant the engine died not before), it shut off as if turning off with the key. It restarted (slightly hard start, like out of fuel) then smoothed out instantly and ran like a top until I reached my destination a few miles away. Thinking CPS, I swapped it out (thanks folks for the advice to carry a spare) and drove home that evening (1 hour) without a bit of trouble. I bought a couple more CPS’s for the glove box supply and a week later left the house, drove Ľ mile and truck again turned off at a stop light, SES/CEL on but this time would not restart. 2 roadside CPS swaps and still would not restart. WTS illuminates and everything looks normal. Returned with a vehicle (30 minutes) to tow it back but tried to start it for grins and it fired up good as new. I parked it at home and now it just cranks but will not fire. At no point have I ever experienced the rough idle, miss or any other symptom, just this total shut off. Oil level is good, fuel pump is running, fuel bowl is full, batteries are charged. Ether is nowhere near my truck
We pulled codes P1316,P1670 and P0460 with my buddies commercial grade scanner. I have read every post the search function could find related to P1316 or IDM’s and only found one that discussed a problem like mine which was a bad IDM. I just bought an AE Ford bundle as I know the scanner can only do so much. Does anyone have any suggestions for a series of diagnostics I should run to try and track down the problem. I have the buzz test on my list but after that, I’m not sure where to go.
Based on the recommendations here, I had BTS do the trans, a 6.0 cooler and Brian installed his software, thanks to everyone for their advise, a little expensive but it has been flawless. Other than a muffler delete (truck came that way) I am aware of no other mods. Truck has 90K miles and came out of Texas so corrosion is not one of my problems
BTW – Is the UVCH connector still an issue in the 2003’s or are the connectors upgraded. I’ve heard some owners say the $ .50 trick doesn’t work due to the wedges but they seem to be 2003 engines. I have not pulled the valve covers yet as the lack of even a hint of a miss makes me think the issue is elsewhere.
Thanks in advance