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Old Jul 13, 2013 | 05:30 PM
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ICP issue

Right before RRE and I have a new issue...RPS between 1600-2100 the truck starts to skip/miss/surge...watching Infinity and the only thing I see is the ICP is bouncing around while this is happening..Also, I am seeing way more smoke across the board than it should be....Whats up???
rotational velocity is good, buzz test good, no codes..other than the 1600-2100 and smoke,the truck runs good..no EGT issues,no boost leaks...
Ideas??
 
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Old Jul 13, 2013 | 06:56 PM
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Have you replaced your ICP sensor? It could be getting oil in the connector. That will cause some odd issues.
 
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Old Jul 13, 2013 | 06:58 PM
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Originally Posted by woodnthings
Have you replaced your ICP sensor? It could be getting oil in the connector. That will cause some odd issues.
I have not looked at it yet but it is new, i'd say less than 8 months (from factory)
 
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Old Jul 14, 2013 | 01:55 AM
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Crap. Those are loose injector symptoms. Has the cackle been getting louder lately? How has your fuel pressure been behaving?
 
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Old Jul 14, 2013 | 06:43 AM
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Originally Posted by Tugly
Crap. Those are loose injector symptoms. Has the cackle been getting louder lately? How has your fuel pressure been behaving?
Rich, no loud crackle..the fuel pressure is moving around a little, sometimes it will drop 3-4 psi and slowly build back up
 
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Old Jul 14, 2013 | 08:17 AM
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Originally Posted by joeyd61
Rich, no loud crackle..the fuel pressure is moving around a little, sometimes it will drop 3-4 psi and slowly build back up
3-4 PSI is nothing to call your attention to. According to your PM, you are well above 50 PSI and that's all good. My loose injector issue would actually make the fuel pressure spike up. Combustion gasses would escape past the fuel O-ring and shock the fuel - causing the bucking.

Skipping over that... it's possible you need a tuning tweak in that part of the fueling map, or you could have a mechanical/sensor hiccup.
 
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Old Jul 14, 2013 | 12:42 PM
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I had an Icp sensor that was within a year old that I had to warranty just cause it's new doesn't mean its good.
 
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Old Jul 16, 2013 | 05:09 AM
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joeyd61 and I talked on the phone yesterday to compare adventures in Buck$Zooka busting, and it sounds like he has "not-quite 100 percentitus".

He's stuck between a stumble at low throttle (like cruise control), or smoke at any acceleration... and three tuners couldn't quite suss it out. ICP is suspect.
 
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Old Jul 16, 2013 | 01:16 PM
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ICP sensor. Or the wiring. Do you have the new style with the bigger base?
 
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Old Jul 16, 2013 | 01:43 PM
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Originally Posted by 2000ca250
ICP sensor. Or the wiring. Do you have the new style with the bigger base?

new from the factory, like 1 1/16"th thread I believe..new one installed, just need some driving time to see if that fixed the problem
 
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Old Jul 16, 2013 | 01:46 PM
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Could always be the pigtail. I replaced mine after I roached it with the 10K mod.
 
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Old Jul 16, 2013 | 01:54 PM
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Originally Posted by 01PS
Could always be the pigtail. I replaced mine after I roached it with the 10K mod.
possibly, what gets me is the issue can be moved around with tunning..
smoky or skipping on throttle or skipping off throttle
 
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Old Jul 16, 2013 | 01:57 PM
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Originally Posted by joeyd61
possibly, what gets me is the issue can be moved around with tunning..
smoky or skipping on throttle or skipping off throttle
Well above my pay grade, sir.
 
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