Normal ICP = Normal ICP?
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Normal ICP = Normal ICP?
If the ICP reading on my ScanGauge is normal, steady, and responds appropriately to acceleration, does that mean that my ICP is in good shape and I don't likely need to replace it?
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 343
From: Breckenridge, TX
Do you mean the sensor itself? If it reads 580-620ish at idle, and there's no oil on the pigtail, then the sensor is probably fine. Pairing the ICP with IPR% is usually a more insightful data point. You having a problem, or just a general question?
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Both, still chasing my occasional rough idle and my wiggling fuel pressure gauge. I keep thinking there may be a way to link the two.
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 343
From: Breckenridge, TX
14.8 at KOEO, 22 at hot idle. When you crank it should jump to 60-80ish, but immediately settle down into the high 20s. If it's running in the 40s-50s at idle it means the IPR valve is fighting something that would be causing low ICP.
I know it's a PITA to get to, but if the connector is dry and the ICP is reading in that normal range of 580-640 idling, you can pretty much rule that sensor out. You could even unplug it and force the engine to run off the ICP_desired, if it still idles funny then ICP is a dead end.
I know it's a PITA to get to, but if the connector is dry and the ICP is reading in that normal range of 580-640 idling, you can pretty much rule that sensor out. You could even unplug it and force the engine to run off the ICP_desired, if it still idles funny then ICP is a dead end.
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I'll check that out. Not sure I programmed that one in, but I have the code for it. I need to get a cheap mechanical FP gauge that will attach to the Schrader valve on the extension braided hose. That should rule the fuel pump in or out. I can't really relate the two problems very well as the gauge often wiggles even when it's idling well. Oddly, it will occasionally be steady at highway speeds.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
14.8 at KOEO, 22 at hot idle. When you crank it should jump to 60-80ish, but immediately settle down into the high 20s. If it's running in the 40s-50s at idle it means the IPR valve is fighting something that would be causing low ICP.
I know it's a PITA to get to, but if the connector is dry and the ICP is reading in that normal range of 580-640 idling, you can pretty much rule that sensor out. You could even unplug it and force the engine to run off the ICP_desired, if it still idles funny then ICP is a dead end.
I know it's a PITA to get to, but if the connector is dry and the ICP is reading in that normal range of 580-640 idling, you can pretty much rule that sensor out. You could even unplug it and force the engine to run off the ICP_desired, if it still idles funny then ICP is a dead end.
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Laughing Gas
Joined: Jan 2012
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From: Lakeland, TN
Not to open that can of worms again, but is an Edge Juice really a "tuner"? Some say no, but would it affect the ICP readings?
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Well, I suppose I can turn the edge off and check it again. The rough idle will often happen after long interstate runs and I have one planned for tomorrow. We'll see what happens then.
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
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From: Lakeland, TN
If by ICPV you mean the same as IPR%, I just set that up last night and it's been idling well ever since. All day it's been 14.4 KOEO, 21.1 at warm idle, and usually 30-40 while driving. All of those are with the Edge on and, as I said, a nice smooth idle.
Last edited by DieselVol; Sep 7, 2012 at 10:56 PM. Reason: Said ICP% when I meant IPR%
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
those numbers you post are IPR% arnt they????
theres 2 set numbers to look at
ICP
ICPV this one is.14v to .25v at KOEO
Basically these 2 are the Same ^^^ones in PSI and others in Volts PCM uses all Volt readings on ALL sensors we use the ICPV to check the Health of that sensor the ICP sensor that is
and IPR% this one normally 14% or so KOEO and 21-22% Idel
IPR Valve is the Controller of HPO
ICP is the Measure of HPO PSI
and really were looking at cause of rough Idel Right?????
so it would be good to get the numbers DURING the rough Idel
if the idel is smooth its all going to look OK normaly so catch it when rough
OEM oil filter Cap ?????????