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Old 12-20-2011, 05:59 PM
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what should idling pressure be?

its running about 20 psi at idle. i have noticed a little bit of a surge at idle lately and a few hiccups when driving. im not getting any codes. also i noticed a little haze of blue smoke when idling when truck is warm. any ideas?
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Old 12-20-2011, 06:03 PM
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Fuel pressure?
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Old 12-20-2011, 06:12 PM
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64 at idle
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Old 12-20-2011, 06:13 PM
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at idle boost should be zero.
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Old 12-20-2011, 06:15 PM
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You're asking what psi should be at idle. I'm asking what are you talking about? Fuel, HPOP, boost, oil?
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Old 12-20-2011, 06:15 PM
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map sensor might be going crazy. 64 isnt possible at idle
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Old 12-20-2011, 06:22 PM
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sorry oil pressure. i have a regulated return i set to 64
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Old 12-20-2011, 06:26 PM
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Quote:
Originally Posted by scotty2280 View Post
sorry oil pressure. i have a regulated return i set to 64
It takes 500 psi from the HPOP to start the truck, so I can't imagine it being less than that at idle. Low pressure would be considerably lower.
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Old 12-20-2011, 06:32 PM
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yea ipr is reading good. truck starts and drives. i wondering if this an early stage of something going wrong. it seems like the truck is quieter at idle.
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Old 12-20-2011, 06:58 PM
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ICP should be about 580 psi @ idle with the engine up to operating temperature in PARK or NEUTRAL on any late-build '04 on up to '07 truck. '03 engines are usually about 620 psi if I recall correctly. IPR duty cycle should be between 21 to 24% at operating temperature on all engines, idling.
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