Go Back   PowerStrokeArmy > Power Strokes > 6.0 Tech

Reply
 
Thread Tools Display Modes
  #1  
Old 03-14-2019, 02:08 PM
Long Gone's Avatar
Long Gone Long Gone is offline
Private
Member's Gallery
 
Join Date: Mar 2019
Location: Malin OR
Posts: 15
Question sudden RPM increase rough iddle

Just got everything back together after HPOP went out due to disintegrated sump screen under oil cooler in an 04 built 8-22-03. Replaced HPOP with Thoroughbreds/dieselsite adrenaline pump/ oil cooler and sump screen (this time SS upgrade of course). Things were looking good, went about 80 mi into town and back no problems other than an exhaust leak that I found was do to me leaving out a spring on turbo to exhaust pipe(?). Replaced spring (with one off the old turbo tube boots left over from upgrade to sinister boots just installed) and had it idling fine for about 5 - 10 minutes while I checked for leaks. Noticed a funny hiss like an air leak that would come and go. I was trying to trace this down when the engine suddenly jumps up in RPMs to just over 1k and runs real rough. It sounds like the throttle is being stepped on an let off constantly with very fast climb and deceleration and a lot of injector rattle. Scan gauge shows high IPR at <> 2600 and icp <> 27 %. I have looked for wire chaff and unplugged the turbo to no effect. The truck will run fine as long as i am over 1k but sounds rough on things when attempting to idle. Needless to say I haven't run it much more than to diagnose. I have checked the seating of the FICM connectors and it seems that all three plugs are seated fine along with the PCMs connectors. Looked online for similar problems but haven't run into anything like it. Surer would appreciate it if someone could point me in the right direction as It just sounds like it is hard on the new injectors (1-2k on them same time as the new OEP head gaskets and New Age SS ARP head studs). The IPR I am sure is suddenly high but why? Is this cause or an effect?
  #2  
Old 03-14-2019, 02:21 PM
Zeb Zeb is offline
Lieutenant
Member's Gallery
 
Join Date: Apr 2018
Location: Downtown Marrowbone Ky
Posts: 555
Default

I think you have your ICP and IPR numbers turned around. IPR should be listed as a %, and ICP as psi.
It sounds like you are losing ICP signal and then it switches to the default setting which will make them idle rough because default ICP is higher than necessary for normal idling.
Is there oil in the ICP sensor plug, and on the pigtail? If there is, that is most likely your problem.
Also see if you have a P2285 code which is lose of ICP signal.
If you find any/all of this, replace the ICP sensor with a Motorcraft ICP sensor for an 05+, and at a minimum clean the pigtail (brake cleaner, air, and then a dab of dielectric grease).
  #3  
Old 03-14-2019, 05:55 PM
ghohouston's Avatar
ghohouston ghohouston is offline
Colonel
Member's Gallery
 
Join Date: Dec 2012
Location: Lewisville,Texas
Posts: 3,815
Default

Agreed! Could have also gotten trash to an injector during hpop replacement.
__________________
1997 F350 SRW CCLB 4x4 ZF5 7.3
2011 International Duraturd 4300 Mechanics truck
2001Tdi Jetta 5 speed
  #4  
Old 03-14-2019, 08:19 PM
Long Gone's Avatar
Long Gone Long Gone is offline
Private
Member's Gallery
 
Join Date: Mar 2019
Location: Malin OR
Posts: 15
Default

Thank you for the input Zeb and gohouston. I have got those numbers backaswards there for sure, sorry about that. I have suspected that it might have something to do with the ICP, but I was not getting my head around it as the lower value at around 27ish would be running the IPR pretty near closed,(as I was thinking that would still be open a bit) and I could see that would lead to the higher pressure but now as you point out and I am finally remember it if you unplug the ICP it defaults to closing alright, and 27 is closed not just kind of close. Thank you I will get right at looking at that connection etc. I am not getting any codes. I wouldn't think it is anything in the injectors as when it first starts up it will run fine for almost 10 seconds. When I changed the HPOP I pulled the HP oil rails and flushed and blew them out real well. Also blew out the HP oil tube supply lines from the pump through the braided hoses into containers so nothing would get back into the head/block. I tried to suck out the injectors with a turkey baster also but don't think it did much. Did find some things that looked like bunkey balls (repolymerized HPOP screen) in the initial draining of the driver side HP oil rail (the first I pulled), but didn't find any thing more in the drain, cleaning and rinse cycles of the other, nor in the lines. My gut feeling has always been that it was something electrical and I think you have confirmed that, and I know where to go now. I would be surprised if there isn't any oil on that plug. Thanks again.
  #5  
Old 03-15-2019, 03:31 PM
Long Gone's Avatar
Long Gone Long Gone is offline
Private
Member's Gallery
 
Join Date: Mar 2019
Location: Malin OR
Posts: 15
Default

Update: Cleaned connector with solvent and blew out connector. reconnected and started fine. ICP 1500 and Ipr 15 ran smooth and normal for about a minute or so and then the IPR jumped to 29, ICP 2900 and RPMs jumped to 1100 and romping harshly.
  #6  
Old 03-15-2019, 03:36 PM
Zeb Zeb is offline
Lieutenant
Member's Gallery
 
Join Date: Apr 2018
Location: Downtown Marrowbone Ky
Posts: 555
Default

Did the ICP plug and/or sensor have oil on them?
  #7  
Old 03-15-2019, 03:40 PM
Long Gone's Avatar
Long Gone Long Gone is offline
Private
Member's Gallery
 
Join Date: Mar 2019
Location: Malin OR
Posts: 15
Default

Y a the plug had some. Hard to see either esp the sensor.
  #8  
Old 03-15-2019, 03:45 PM
Long Gone's Avatar
Long Gone Long Gone is offline
Private
Member's Gallery
 
Join Date: Mar 2019
Location: Malin OR
Posts: 15
Default

I'm wondering if the wiring harness isn't chaffed some where. I was messing with the exhaust clamp on the turbo, passenger side just before this started happening so I'm wondering if I bumped something there.
  #9  
Old 03-15-2019, 05:15 PM
Zeb Zeb is offline
Lieutenant
Member's Gallery
 
Join Date: Apr 2018
Location: Downtown Marrowbone Ky
Posts: 555
Default

There is very little wiring on the passengers side top of the motor that would affect how it idles.
If there was oil in the ICP plug it is almost assuredly coming from the ICP sensor.
  #10  
Old 03-15-2019, 06:24 PM
Long Gone's Avatar
Long Gone Long Gone is offline
Private
Member's Gallery
 
Join Date: Mar 2019
Location: Malin OR
Posts: 15
Default

I think the oil was on the plug from the work I did. I noticed it as I was putting the harness back on, but didn't think that much about it at the time. I don't think the sensor is leaking, but it is hard to say for sure. It seems to be sending numbers that are close to where I would expect them to be. I am wondering about the IPR, I am thinking that it is not opening as it should. The fact that the IPR went to 29 from 15 when the IPC went to 2900 from 1500 though kind of flies in the face of that so maybe the IPR change did actually cause the increase in pressure. The oil has to not be very warm yet at one minute in. So I guess the ICP being the problem makes more since as there would be a direct correlation there and for it to be the IPR it would have to be suddenly closing for no apparent reason, and if that were the case you would expect the ICP to at least stay open all the way at 15 as it makes no sense for it to go to 29 (which would direct the IPR to close a bit) the opposite direction needed. Ya I wouldn't think that the passenger side injector harness would have any such effect, it's just that I hadn't been doing anything on the driver side that has all the control wiring. Just weird the timing of it, but there is never a good time I guess. At least I wsn't on the road.
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 04:21 AM.

 

Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

Designed by Military Ltd