Slow icp pressure .. sometimes

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Apr 11, 2018 | 07:52 PM

Stainless1974

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Slow icp pressure .. sometimes

crank / start times vary. Sometimes builds pressure and starts normal and others and moreoften once the truck sits for 5 min it cranks for 5+sec sits at 65 psi then ramps up and fires. Any ideas would be great!

Apr 12, 2018 | 03:51 PM

WatsonR

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From: Virginia Beach VA

What year? Parking nose up in the driveway?

Apr 12, 2018 | 03:54 PM

Stainless1974

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2006, doesn't seem to matter which way your parked, ficm is steady 47.5-48.5 . Temperature doesn't seem to effect things either . Would a small high pressure leak do this?

Apr 12, 2018 | 03:56 PM

WatsonR

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From: Virginia Beach VA

Stand pipes and dummy plugs been done or the STC fitting changed?

Apr 12, 2018 | 03:58 PM

Stainless1974

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Not sure, the truck is a 2003 cab/ box on a 2006 chassis so I'm having a hard time with the vin. What's your thought in the parking ? Maybe I could try something there

Apr 12, 2018 | 04:03 PM

WatsonR

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From: Virginia Beach VA

HPOP on older trucks lose the seal, that year wont. You need a live gauge to monitor ICP and IPR as you crank it to see what happening. Torque Pro, Scan Gauge II, search will yield much reading.

yes, a small leak could do this.

Apr 12, 2018 | 04:10 PM

Stainless1974

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I can see the icp with the edge insight I have . The pressure when it's running is between 650 and 3500. Defiantly takes longer sometimes to build to the 500 mark, as it's cranking it's around 65-75 bouncing around and then when it's "ready" ramps up quick and starts

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Apr 12, 2018 | 04:26 PM

WatsonR

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From: Virginia Beach VA

You have a leak. Air test it. IPR is 14.8 at KOEO and 77% at start. 21.4% at hot idle, 24% or more would say a leak. 40% at 2500 rpm in park, all at 192° operating temp.