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Re: OT, 93 F-350 Diesel problem
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Posted by Bob on December 02, 2004 at 15:25:57 from (66.163.134.177):
In Reply to: Re: OT, 93 F-350 Diesel problem posted by ChadS on December 02, 2004 at 15:09:05:
The cam on the throttle shaft is set using an angle gauge. I don't have specs at hand, though. The more you screw the Allen-head screw in at the bottom of the lever, the more the timing will retard. Outside of a test stand, I'm not sure how to accurately set that. Are you aware of the HPCA solenoid (Housing Pressure Cold Advance)? This is the second wire attached to the pump cover, more rearward as it sits in the pickup. There is a thermal switch near the thermostat housing that supplies battery voltage to that second terminal when the engine coolant is below about 129F. That solenoid dumps pump housing pressure, causing the cam ring to advance for better starting, and clean running at startup. If that system is working, there will be extra diesal rattle at startup until the coolant temp comes up, and then it will abruptly retard a few degrees. This is also hooked to the high idle solenoid. If the HPCA system is not working, there will be more smoke and rough running at startup. Have you noticed if the advance and/or the fast idle are working? Did you take a look at the fuel lift pump, for possible weeping and leakage that might also inducate fuel is leaking into the crankcase?
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