Check out the third post by Bismic1 in this link Troubleshooting a No-Start condition - PowerStrokeNation : Ford Powerstroke Diesel Forum. It does a great job of explaining what your IRP duty cycle and ICP voltage should be doing.

I just finished replacing my IPR the other day. Mine would just randomly not start. I ended up pulling the IPR and the screen was covered in stuff. I replaced it and so far everything is great. Here is a link ot my post Oil Pressure Problems-thinking ICP - PowerStrokeNation : Ford Powerstroke Diesel Forum.

I also have a Scan Guage II. You can also upload a PID to monitor the ICP voltage if you want to.

 

Thanks brute mt... what's the PID for ICP v, all I could find was pressure (which I have) anyway so from what i understood about Bismic's post IPR should be 10-15 KOEO, mine is 14... while cranking should jump to 84, mine is 53 (but also tuned so I'm gonna return to stock and see what she does... and it should be 22-24 at hot idle, mine is 22.3 at hot idle... also, if I check voltage while cranking, at ICP with a voltmeter, it reads 1.23 (cant remember if that's cranking or KOEO) anyway I'll do some more checking on stock and update my post.

 

So what happens if my icp reads 5 at koeo

 

ok checked it with the truck stock KOEO no ICP psi, IPR 14.2... cranking the damn truck started too fast ICP was starting to build and IPR jumped to 45 then it started. (it started quick and those values were climbing but dropped back to 700 on ICP and 28-30 on IPR... after driving at hot idle I got 580 ICP and 22.5 IPR duty..... Like I say the trucks been fine for a few weeks now but I'm just waiting for it to up and not start again.

 

It sounds like all of your values are right where they should be. You probably won't see your IPR duty cycle reach 85% unless you have a long crank. You can check this next time it doesn't start for you. Also unplug your ICP next time it doesn't fire up. If it starts after you uplug the ICP, than your ICP is no good. Your situation sounds alot like mine overall. Mine ended up being all of the junk on the screen of the IPR.

When I'm monitoring my IPR duty cycle on my SCII, it'll only reach 40~55% before it fires up. I know it just isn't cranking long enough to reach 85% because mine fires in about three turns.

Here is a link from Mhatlen on SCII PIDs PowerStrokeNation : Ford Powerstroke Diesel Forum.

I don't know if this is the one that I'm using for ICP voltage (at work and don't have my truck here). When monitoring the ICPv, it should reach 0.80 volts when cranking. 0.80 volts is equal to 500 psi of oil pressure. This voltage will increase as your oil pressure increases during acceleration. The ICP sensor will only go up to 5 volts.

 

awesome brute mt, I appreciate it. The last time it didn't start a few weeks back, I did unplug the ICP and there was no change so I figure she's good, anyway... last night the truck had sat for a couple days and I went to start it..... It was a long crank (mayb 5-6 seconds, no that long, but longer than usual.) IPR stayed steady at 33% or so, but she still started... All other values still looking good tho, I'm gonna put ICP voltage on and monitor that as well... I believe that I'll b finishing my EGR delete next week and while I got everything apart I may do oil cooler and Pull IPR to see if the screen is clogged as yours was.... decisions decisions... my coolant temp at highway speed is 188-190 and EOT is 210-213, is this an indication of a cooler failure if above 15* at highway speeds??

 

No problem. You're correct on the oil cooler being clogged if you have more than 15 degree difference in EOT and ECT.

 

nice!!! city driving the EOT and ECT are 11-15* different but from Cookeville back to Manchester (1 n 1/2 hr drive) it was more like 20-22* I suppose that still indicates an issue huh?

 

You have an issue

 

Thank u Bismic1, I figured I did but thought I'd ask anyway with the extra info. Brute was giving me some insight as far as my IPR goes when it comes to my interrmittent starting issue. Do you have any insights on this as well? Does it sound like a clogged screen as his was? If so, what might be the cause of the screen clogging? Or what could be some things to look for? I posted my numbers in some previous posts.

ICP psi
0 KOEO
It builds psi cranking but since having SGII, it doesn't build to 500 cause it starts too quick, I havent had the SGII on a no start yet
582 @ hot idle and builds lots of pressure driving and over 3,000 @ WOT

ICP v
.24 KOEO
builds higher on crank, not sure how high tho mayb as much as .5, .6 before starting
.82 roughly @ hot idle

IPR duty
14 KOEO
has built to 40-53 cranking
22.5 @ hot idle
as much as 75 WOT

The truck has SCT X3 with Spartan Hybrid race tune on.

 

Your IPR and ICP numbers look good to me.

At the times it doesn't start, is it first thing in the morning?

 

It's been when engine was hot and cold, but I've found a few different problems.
Here's a brief summary,
1)First time no start FICM was bad, injectors barely buzzing and wouldn't start when cold, tested ficm by voltmeter and was 20-30 volts, so bad FICM, tried the fix and no luck.
Got a new FICM, problems fixed

2)few weeks later, a no start.. I parked the truck (I think I remember this correctly), and a few hrs later, no start
charged batts and checked ICP by voltmeter, ICP looked good but no sart. Checked a few other things fuel psi, etc. and nothing, charged batts a second time and it fired up. Drove to load test batts and they were bad... got new batts and truck was fine.

3)The last time to date it happened, (two weeks after new batts) the truck was started and moved to flat ground so I could work on rear end, so it ran for about 30-45 seconds.
After working on the truck, had a no start again for about two days then it randomly started... That's when I got the SGII and all the readings was after this last no start. It's been runnin good since then but there has been a couple of llooooonnnngg cranking starts 5-10 seconds before starting and no matter if it fires right up, or takes a long crank to start, it still has the same readings on IPR, ICP, ICP v

I did read in your post that IPR should reach like 84-85 when cranking? On those lllooonngg cranking starts, should I be reaching that number or?? I'm just puzzled, I may have to wait til she doesn't start again

Also everytime it start (well about 90% of the time it starts), it starts really HARD almost sounds like my foot is on the throttle, as opposed to a smoother start if that makes sense.

 

Also a quick question about Oil Coolers, at the parts store (O'Rielley's) I was priced one for 199.00... Should I go with this or is there another option that anyone would suggest as far as Oil Coolers go? I noticed, for instance, that RCD has one for like 408.00 I think and all it says is "upgraded screen"... I was just unsure of what to go with.

 

I wouldn't buy a Dorman oil cooler - they are made in China and I will wait for a few years worth of operating experience before I would risk it or recommend it.

You can buy the rebuild kit from Ford for a reasonable price. They call it the replaceable core.
3C3Z-6A642-CA
It is $270 from tousleyFordParts.

Have you checked for wiring harness chaffing. That is what it sounds like you have. Also, you probably should have the alternator checked out (unless you already have and I missed it).

 

Ok good deal, that's kinda what I worried about when he said it was Dorman. I have checked for harness chaffing, but not a GOOD in-depth look for chaffing. Also, I did have the alt checked when I got the batts checked (you didn't miss that, i just forgot to post it) the alt checked good, but when I check voltage on my SGII it seems a bit wierd... It seems to float between 13.3-14.1 but mainly stays at about 13.8. I really appreciate the input as well as Brute's, when I change cooler and put my EGR up pipe in, I'll do a good check for chaffing + if I have another no start I'll crank for a good bit to check all my numbers again.

 

This is an old post, but FWIW, I had my ICP sensor go out on me. I could crank it for almost several minutes with the ICP plugged in. But unplug it, and she fired right up.

 

OK guys I started having no start issues and finally it won't start at all, my Ipr reads 84.7 while cranking and Icp is at 350 does this should like a Ipr valve issue?

 

You could try unplugging the ICP and see if that helps, but it doesn't sound like an issue with the sensor.

It could be the IPR, or you could have a leak in the system, or it could be a bad HPOP.

I suppose you could pull the IPR valve and inspect it if you wanted to do that before doing the air test. Sort of a toss up IMO.

What year truck? Is it a "no start when hot" or just a no-start period?

 

No start period 2005 did it to my wife before and she would cycle key and it would eventually start plus when I monitor it will immediately go to 84.7 when cranking

 

Mine reads 85 at wot
Truck surges at idle a bit maybe about 100 Rpms
Surges a bit worse after wot
Any ideas anyone??