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Old 10-25-2012, 03:04 PM
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Lower than normal ICP Voltage

My Icp never sees anything past 2.3V under WOT and nothing past 1950+Psi on the Psi side....i just did all the Updates, STC etc etc. I have Vivians Economy Tune with 40RWHP and EGR Delete. Anyway to test why its so low? she said its too low might be on its way out, but i feel that after i did all the updates to the motor and all this happned. any ideas? i dont wanna buy a new ICP if its good.....and there is no oil around the sensor
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Old 10-25-2012, 07:36 PM
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What you can do to see if it is a true reading or an out of range sensor. Remove the ICP sensor, screw in a adapter;hose and pressure gauge rated for at least 4000 psi.
Start the engine and comapare the mechanical gauge reading against the electrical reading from your scanner or monitor. Raise the rpms in increments and see if the readings change and stay together in psi range.
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Old 10-26-2012, 03:29 AM
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I've heard on this forum that tuners will alter icp in tunes to allow for higher pressures pretty fool the engine.


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Old 10-26-2012, 03:38 AM
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Take the tune out and check your readings again.
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Old 10-26-2012, 08:39 AM
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you may not be getting an actual voltage reading but a pressure reading converted to volts.

I've seen personally seen low ICP in the higher HP tunes. I guess it's a characteristic of the tune.
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Old 10-26-2012, 09:43 AM
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Matt it is a characteristic of the higher hp tunes. The tune writer halves or quarters the icp tables to that the PCM thinks its getting lower icp pressure than it really is so it won't defuel at higher Rpms. This is why with any scanner when your tuned for high hp your icp will only read say 1950 psi instead of an actual 3900psi. One way you can confirm this op is to return your truck back to stock and get your readings again. If it is the same than something in your hpo system isn't right. If it goes to 3900-4000 psi than its a characteristic of the tune.
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Old 10-28-2012, 03:09 PM
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Ok so i put the truck back to stock, and it reads all good, ICP V and ICP Psi.....Put the tune back on and it goes back to max 2.3V and 1950psi maxing out so it must be the way the tune is written
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Old 10-28-2012, 03:14 PM
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Yep you got it
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