ICP Voltage not consistant -suggestions?
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Postmaster
Joined: Jul 2006
Posts: 3,754
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From: Indianapolis
ICP Voltage not consistant -suggestions?
My engine is running ok, but still not as smooth as I think it could be. I hooked up my Predator last night, and the ICP voltage is not consistant, and I'm guessing that this could be a reason for the rougher than normal running. Where should I start? Should I change the ICP sensor first? Not sure of what would effect the ICP other than the HPOP, and that's only a couple of years old. ANy ideas where to start looking to avoid throwing money at it -that I don't have LOL.
THanks!
THanks!
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Ohm the IPR solenoid. It should read somewhere between 10.2 and 10.8 ohms. The reading should be steady and not vary. If the reading fluctuates it can be the cause of rough running. If the solenoid holding nut is loose when you go to remove the solenoid that may well be the problem
The needle in the IPR may not be sliding smoothly which will also cause rough running.
If the IPR is not working properly then the PCM will see erratic ICP pressure and make erratic adjustments.
The needle in the IPR may not be sliding smoothly which will also cause rough running.
If the IPR is not working properly then the PCM will see erratic ICP pressure and make erratic adjustments.
Thread Starter
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Postmaster
Joined: Jul 2006
Posts: 3,754
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From: Indianapolis
Late reply- was busy putting up the trash cans and helping daughter with math homework... anyways, tonight I took readings from my Predator, on both stck and 80E- here's what I got
Stock
rpm- 686-702
ICPv- 1.10-1.8v
Pulse width- 1.128- 1.84ms
80E
rpm- 654-692
ICPv- 1.10-1.9v
Pulse Width- 1.112- 1.240ms
SO thats the best I could come up with given they all keep changing. Anyone know how these numbers look?
So if you can see anything worng with pirctue
Stock
rpm- 686-702
ICPv- 1.10-1.8v
Pulse width- 1.128- 1.84ms
80E
rpm- 654-692
ICPv- 1.10-1.9v
Pulse Width- 1.112- 1.240ms
SO thats the best I could come up with given they all keep changing. Anyone know how these numbers look?
So if you can see anything worng with pirctue
Elder User
Joined: Jun 2007
Posts: 705
Likes: 1
From: Sandia Park, NM
I've been dealing with the same thing for over a year now. Replaced ICP, ICP harness, IPR, CPS, etc. and it still runs rough. The ICP voltage looks like a square wave when I plot it in AE. I've been having another problem that I think I traced back to my APP sensor. Bought a new pedal assy that I'll install this weekend. I'll let you know if that fixes my fluctuations.
Elder User
Joined: Mar 2008
Posts: 626
Likes: 0
From: Ontario, CA
Danny:
I did some data logging in late October with the Predator. I've got the file at home, and I think it gave me a GANG of info I wasn't after. I'll try to post up numbers later today, give you something to compare against.
I did some data logging in late October with the Predator. I've got the file at home, and I think it gave me a GANG of info I wasn't after. I'll try to post up numbers later today, give you something to compare against.
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Postmaster
Joined: Jul 2006
Posts: 3,754
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From: Indianapolis
Hey guys I really appreciate everyone doing what they can to offer help and advice on this damned issue. Ultimately for me what it boils down to is that I just need a reliable truck that I know won't break down while I'm running a load of cars somewhere.
About 42,000 miles ago my block cracked out of the blue, in the middle of freaking nowhere on the 395 on my way to Reno to pick up a trailer. Between towing, the stealership, and me rebuilding the block it cost right about $4000. Still saved over $6000 by doing it myself.
Then while making a run to North Carolina with a load of cars I broke down in Las Cruces NM- 2 injector cups where leaking coolant into the oil. Had to sub out the run, lost that pay plus the idiot I hired damaged two of the 6 total cars, and between hotels and the stealership "doing it by the book only" (take off the cab, pull the heads), car rental for a week to get back to SoCal, that nightmare cost me about $3000.
I retire from the Corps in 2 years, and want to run full time in SoCal and can't afford, nor do I want a new truck with a warantee.
About 42,000 miles ago my block cracked out of the blue, in the middle of freaking nowhere on the 395 on my way to Reno to pick up a trailer. Between towing, the stealership, and me rebuilding the block it cost right about $4000. Still saved over $6000 by doing it myself.
Then while making a run to North Carolina with a load of cars I broke down in Las Cruces NM- 2 injector cups where leaking coolant into the oil. Had to sub out the run, lost that pay plus the idiot I hired damaged two of the 6 total cars, and between hotels and the stealership "doing it by the book only" (take off the cab, pull the heads), car rental for a week to get back to SoCal, that nightmare cost me about $3000.
I retire from the Corps in 2 years, and want to run full time in SoCal and can't afford, nor do I want a new truck with a warantee.
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Elder User
Joined: Mar 2008
Posts: 626
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From: Ontario, CA
Danny:
Sorry! I just opened the file, and I didn't record pulse width or ICP Voltage. Just pressure, and duty cycle were what I was after...
If it will help, I'll check it in a while. Let me know!
Sorry! I just opened the file, and I didn't record pulse width or ICP Voltage. Just pressure, and duty cycle were what I was after...
If it will help, I'll check it in a while. Let me know!
Thread Starter
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Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
Ohm the IPR solenoid. It should read somewhere between 10.2 and 10.8 ohms. The reading should be steady and not vary. If the reading fluctuates it can be the cause of rough running. If the solenoid holding nut is loose when you go to remove the solenoid that may well be the problem
The needle in the IPR may not be sliding smoothly which will also cause rough running.
If the IPR is not working properly then the PCM will see erratic ICP pressure and make erratic adjustments.
The needle in the IPR may not be sliding smoothly which will also cause rough running.
If the IPR is not working properly then the PCM will see erratic ICP pressure and make erratic adjustments.
Thread Starter
|
Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
Grant- I'd love to have it live tuned again, but I never know when Jody will be back out west again. I'd pay the $400 to get this damn thing running right.
Don, if you have a spare minute, I'd appreciate the help but don't go outta your way for this.
Don, if you have a spare minute, I'd appreciate the help but don't go outta your way for this.
Elder User
Joined: Mar 2008
Posts: 626
Likes: 0
From: Ontario, CA
Danny:
Here's some numbers from this morning.
Stock - Started up...
rpm: 711-728
ICP v: 0.83 - 1.03
FPW: 2.648/2.728
Stock, Warmed up...
rpm: 666/688
ICPv: 0.68/0.86
FPW: 2.664/2.728
80e, warmed up....
rpm: 672/688
ICPv: 0.78/0.78
FPW: 2.664/2.744
Don't know if this will help you diagnose or not....But good luck to you Brother!!
Here's some numbers from this morning.
Stock - Started up...
rpm: 711-728
ICP v: 0.83 - 1.03
FPW: 2.648/2.728
Stock, Warmed up...
rpm: 666/688
ICPv: 0.68/0.86
FPW: 2.664/2.728
80e, warmed up....
rpm: 672/688
ICPv: 0.78/0.78
FPW: 2.664/2.744
Don't know if this will help you diagnose or not....But good luck to you Brother!!
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Pull the solenoid off the IPR. That will allow you to check and clean the pins on the solenoid and the connector.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
ICP will fluctuate as the engine is running. What are you seeing with the engine off? It should be stable there. Also the values will decrease as the engine warms up. First thing I would do is pull the ICP connector and look for oil on the contacts. If you see oil, replace the ICP sensor. The oil messes with the resistance and causes the PCM to hunt for the right pressure.
You say it is not running smooth. Is it at idle, or all RPM's? That makes a big difference to what you should be looking at. I switched over to an OEM black CPS and my idle became much smoother. Adding a Riffraff FRx also helped.
You say it is not running smooth. Is it at idle, or all RPM's? That makes a big difference to what you should be looking at. I switched over to an OEM black CPS and my idle became much smoother. Adding a Riffraff FRx also helped.