Posted by Bob on October 17, 2007 at 17:17:27 from (69.178.229.154):
In Reply to: 6.5 diesel again lol posted by smdv806 on October 17, 2007 at 15:43:39:
Any trouble codes?
That DS4 pump uses a fuel cutoff solenoid and a "fuel solenoid".
The fuel cutoff solenoid is actvated as soon as the "ignition" switch is turned on. The mechanicals of the pump are very similar to the "DB" mechanical pump it replaced, with the exception of the second "fuel solenoid".
This solenoid is commanded to CLOSE by the 'puter (through the PMD) just before EACH injection event.
The precise fraction of a second that solenoid (FS)closes determines the START of injection (timing), and the exact millisecond the solenoid is commanded "OPEN" determines the LENGTH of each injection cycle, and, therefore, the fuel rate.
When the FS opens, the remaining fuel from that injection cycle is "wasted" into the pump housing, rather than being forced through the injector.
You need a signal from the crank position sensor TO the 'puter, as well as the "fine" position signal from the optointerrupter in the IP for the "puter to get a "fix" on when to begine injection. Then the 'puter has to be functioning to interpret all that, and feed a signal to the FSD, which powers the fuel solenoid, as required, as well the the fuel solenoid on the pump's "head" to do what the 'puter, though the PMD commands it to do. So, there's a LOT that can go wrong.
Start by checking ALL the fuses and fusible links, as well as ALL engine grounds.
There MAY be trouble codes as well.
Here's a photo of the pumps internal "fuel solenoid", from the "Real Diesel" website:
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