1st time poster, Needs advice/help
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New User
Joined: Mar 2008
Posts: 22
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From: Dallas, TX
1st time poster, Needs advice/help
Hello all, Ok I am totally stumped, and hope that someone can HELP with this issue, 95 Powerstroke very very random stalling. replaced CPS and still has an issue, could be sitting and idling or taking off from a traffic light it will just die, kick it in neutral and it always re-starts, just not real fun trying to control a 6200lb truck with 35 inch tires without PS or brakes. Could it be as simple as a connector that is loosing contact for a brief instance so that the CPS doesn't read? Any help with this would be greatly appreciated.
Thanks
David
Thanks
David
Senior User
Joined: Aug 2007
Posts: 225
Likes: 1
i've seen some folks suggest making sure your batteries, cables, and connections are in good shape.
could it be the little throttle/idle switch on the gas pedal?
maybe you got a used or defective CPS?
the good news is that it is usually something simple! good luck.
could it be the little throttle/idle switch on the gas pedal?
maybe you got a used or defective CPS?
the good news is that it is usually something simple! good luck.
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
Welcome to FTE !!
Some Cps' are bad even when new. You could try another one. Before I did that I would check the Under valve Cover harness (UVC) and connections as well. Be sure the connections are not burned or melted and are getting good connections. Also check the regular stuff like batteries/connections and sensor connections.
Does it have a chip? If so you can remove it and see if that fixes it.
Good luck and post often.
Some Cps' are bad even when new. You could try another one. Before I did that I would check the Under valve Cover harness (UVC) and connections as well. Be sure the connections are not burned or melted and are getting good connections. Also check the regular stuff like batteries/connections and sensor connections.
Does it have a chip? If so you can remove it and see if that fixes it.
Good luck and post often.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Originally Posted by LittleGreen4x4
Hello all, Ok I am totally stumped, and hope that someone can HELP with this issue, 95 Powerstroke very very random stalling. replaced CPS and still has an issue, could be sitting and idling or taking off from a traffic light it will just die, kick it in neutral and it always re-starts, just not real fun trying to control a 6200lb truck with 35 inch tires without PS or brakes. Could it be as simple as a connector that is loosing contact for a brief instance so that the CPS doesn't read? Any help with this would be greatly appreciated.
Thanks
David
Thanks
David
In the power distibution box under the hood there are 4 small relays ...switch 1 & 2 with 3 & 4 ......Do one test at a time , so you know what fixed it ....
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Posting Guru
Joined: Feb 2008
Posts: 1,526
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From: Grass Valley, CA
I'd check your High Pressure Oil Pump. sounds to me like you arent getting fuel at low RPMs. also, on the same line, make sure you have enough good oil in that 14qt bucket you're hauling around...
other than that, my next guess would be injectors, try cleaning them, although i dont know how, if im anywhere close to the right track, someone who comes along will know.
other than that, my next guess would be injectors, try cleaning them, although i dont know how, if im anywhere close to the right track, someone who comes along will know.
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Thread Starter
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New User
Joined: Mar 2008
Posts: 22
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From: Dallas, TX
Wow thank you everyone who has offered help, a quick update, currently running a couple of fresh tanks of fuel with injector cleaner, and the truck hasn't screwed up since, did check the items mentioned and found that the Valve cover wiring harnesses were replaced not long ago found a receipt in the glove box, everything else looked good went one step further and had a field day with some dielectric grease to make sure water and such stayed out of the connectors, just bought the truck a few weeks ago so slowly going through it. will get a pic up for all to see, and thanks again for all the support.
David aka LittleGreen4x4
David aka LittleGreen4x4
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Joined: Jun 2005
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the dialectric grease is a good measure to take, i do that to all vehicals that i purchase get a couple cans of electrical contact cleaner and some dialectric grease and go to town. i havent gotten to it on my psd yet, iv noticed several times that they run better after doing that as well
Thread Starter
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New User
Joined: Mar 2008
Posts: 22
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From: Dallas, TX
Well me and my BIG mouth..LOL talked how good it was doing and well lets just say i had to have a turret moment with my truck. Ok here is what was going on low speed under 10 mph driving, and was messing with the throttle pedal, it would cut out like it was going to die but stayed running just no power until i let off the pedal and let the switch reset, and when it did this the wait to start light came on then went off. Do the Powerstroke have a throttle position sensor like a gas engine? or possibly the little switch itself? UGHHHHH checked everything under the hood all plugs looked great nothing burnt or corroded, and did notice many new and shiny parts the previous owner must have installed prior to selling it.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
these trucks are fly by wire meaning they have no throttle cable or linkage they use a throttle position sensor on the pedal along with an idle validation switch on the pedal as well. If the IVS doesn't close when you push down the throttle it will only idle. So the PCM needs to see two things to do anything other than idle. the first is to see the normally open IVS close and then it needs to see the required voltage from the TPS (between .5 and 4.7 volts) depening on throttle angle.
It could be you newest issue is a sticky IVS. I would remove the three 13 mm nuts holding the pedal assembly to the fire way and clean IVS really well with brake cleaner then dose in WD40.
It could be you newest issue is a sticky IVS. I would remove the three 13 mm nuts holding the pedal assembly to the fire way and clean IVS really well with brake cleaner then dose in WD40.