Reply to thread

Message: [QUOTE="Suny, post: 107866, member: 2682"] Whats happening guys, I work for a fabrication company that has a fleet of rental Heavy Equipment units. So when anything in the field brakes down we have a F550 as a service truck to go fix what ever brakes down. The truck has a boom, air compressor a whole tool box on the back aux lighting. Its a pretty descent rig to say the least. It also has a PTO to drive all the auxiliary stuff and an auxiliary engine speed controller, from Ford. You can drive the truck no problem, but after letting it sit for a while idling or after using the engine speed controller the truck seems to loose its signal from the throttle pedal. But you can still control the engine speed with the aux engine controller. If i remember correctly. Ill have to try this tomorow. To try and correct the problem the shop has thrown countless parts at it in hopes to correct the problem. From Throttle pedals, Crank Sensors, Cam sensors, Injector drive module. So they sent the truck to the Ford dealership in town. They said the PCM was at fault. So we went and bought a new PCM. The truck is still having the same problem. We are lucky enough to have a simple code reader, since the truck had acted up i was able to pull a few codes. P0603 Internal control module KAM error P1316 Injector circuit/IDM codes detected P1670 EF signal not detected One thing i want to try is to unplug the auxiliary engine controller for the pto and see if the problem goes away or is still there after. Any ideas what im looking at? I downloaded the wiring diagram for the truck on this site and have gone threw lots of the other thread in this sub forum. This was the closest i could find to the problem im having. [url]http://powerstrokearmy.com/forums/showthread.php?t=1423[/url] But i think mine is different. Just another quick question is the truck has a long start after it has been sitting for more than a week. It seems to loose its prime. Is there a test port to check fuel pressure what should it be with key on, or during cranking? [/QUOTE]