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Discussion Starter · #1 ·
Hey there,

About a week ago, I started my truck and was about to take the GF home, but after idling for about a minute, (outside temp was 31F), the truck started loping, and eventually it was idling really rough. I killed it, started it back up, and it would idle really rough. Now, it doesnt start at all, and doesnt throw codes.

So far, ive replaced the fuel filter, and i get 68 psi to the filter bowl. Doesnt start with ICP sensor disconnected, and CPS is still good. When the truck was still my grandpa's, he removed the fuel bowl heater system entirely, so thats not the culprit either. Fuel level is at about 1/4, but its never had problems running at almost empty.

Truck has 290k miles on it, its a E99 Lariat.

Figured id ask for suggestions on what to check, and how to do so.

Im thinking it could be the UVCH, or maybe the IGR. Or bad/clogged injectors, but I dont know where to start, and i want to try the easy (and cheapest) tests first, as both money and time i have to spend working on the truck is extremely low.
 

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Discussion Starter · #3 ·
WTS turns on as usual, and I inherited an AutoEnginuity kit with the truck when my grandpops passed. AE provided no codes.
Batteries were new a year ago, and I charged them this morning before trying to start it.

Ill have to check them with my multimeter once i find it, as well as the fuses
 

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Discussion Starter · #6 ·
Alrighty, so i figured AE. I didnt have it fully set up, thats on me. Ran buzz test, drivers side bank is down. They did buzz, but they were all weak buzzes.

Went to ohm everything, and connector on the valve cover (not the 42 pin one, the one for just the injectors and GP), injectors read about 4.5-4.9 ohms, could be a crappy multimeter.

Ohmed from the 9 pin to the 42 pin connector, everything was about 5 ohms, and #8 was reading 5.5 ohms.

*side note, should i be able to read ohms from between the injectors?

Doublechecked the passenger side, everything was below <4 ohms.

Seems like it could be something to do with idm, or are the ohms too high?
 

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Discussion Starter · #9 ·
New UVCH, everything seemed great. Buzz test sounded good, and i wasnt getting a SES light anymore. Truck was buttoned back together, and ran good for 15 ish mins when i was warming the engine up.

Right as i was about to leave, same problem happened again. Buzz test gave me the same codes, and injectors sounded very muffled.

Thinking my idm has a wire somewhere i didnt see the first time around, or is going bad.
 

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Discussion Starter · #12 ·
Looked at all the wires from the 42 pin to the UVCH. Nothing was chafed or anything. Will be checking the IDM tomorrow, and im gonna double check the wires from the 42 to the idm itself just in case.
 
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