Truck won't start. Weird Buzz Test

[dthompson]

01 F-350. Drove the truck in the garage and was trying to diagnose a hot start problem. Next day won't start. Now only #1 injector buzzes on a buzz test. Swapped out IDM with one laying around and same thing. Figured maybe I'd ohm some wiring, just seems odd that only one buzzes. Anyone have some suggestions where to start? Thanks guys

 

[ghohouston]

I'd ohm out the uvch's first

 

[dthompson]

Ohm'd the uvch harness, and they are fine. Swapped cps too. No luck.

 

[Arisley]

unplug the 42 pin connector on the driver side valve cover. Inspect it and shoot some contact cleaner in there. Do the same thing with the IDM connector.

 

[dthompson]

Will try that later today. Thanks.

 

[dthompson]

Cleaned contacts at both connections. Looked pretty clean. No luck.

 

[Arisley]

Of course you have already checked all fuses and relays, correct?

 

[Lethalthreat7.3]

Sounds like a uvch issue. If #1 is buzzing and you changed the idm(no difference) then the other three on that bank should buzz as well. Vref is the same for all four on the left bank with a different but common Vref for the other four on the right bank.

Not sure if you tested at the uvch's or the 42-pin but try using a 200ohm scale meter and ohm out each injector to the correct vref for the corresponding bank.(sorry don't have the pins/pic handy)

 

[gman1]

See if these diagrams help.
http://powerstrokearmy.com/forums/showpost.php?p=1158360&postcount=4

 

[dthompson]

Thanks guys, ended up having some loose wires in the 42 pin connector.

 

[dthompson]

Ok, still doing it. I ohm'd from supply through to each injector as mentioned. All around 3ohm. Still not buzzing but just sounds like one single injector. What now?

 

[dthompson]

http://www.gbreman.com/techbulletin_103.html

Just ohm'd according to this and everything was right. Fixing to grab another idm and try. What am I missing guys?