I can't remember where the IPR is located, on the HPOP? Also I read on another post to unplug the ICP to check the IPR. Is that right?

Thanks for any help.

 

IPR is back of HPOP waaay down in the valley there to the driver side of the fuel bowl. There's a tin nut that holds the electromagnet on the body of it. Needs to be pretty snug from what I've read. The only thing I've ever heard unplugging the ICP will do is tell you if it's bad. Say you have a poopy idle and it smooths out when you unplug the ICP. That would point to a bad ICP sensor. I'm no expert, just trying to recall things from memory.

 

Can't post a link from this computer. Guzzle has an IPR rebuild writeup on his site. Google that for pics of the IPR.

 

I think I found it. Way down on the back of the HPOP with an electrical connector not seeming to be connected to it, but located just above it. Anyway it is the only tin nut I see down there and it is tight.

Would the ICP cause a no-start, and unplugging it be another quick easy thing to check? If so, where is that one?

I apologize for my ignorance. Thanks again for the help guys, without it I would be at a garage, and poorer than I already am.

 

Try checking the oil in the hpop resivior. Should be within an inch from the top. If its low signs would point to a lpop bad. Is there fuel in your fuel bowl? Can you hear the pump come on with key on? Just throwing out ideas. Wire harness over the driverside valve cover could be worn through. ??

 

I have fuel in the fuel bowl, I hear the pump come on and the fuel bowl refills. I don't know what the pressure is, or if that matters... I checked the under valve cover harness a while back with an injector issue I was having. I will check the oil level now.

It just seems strange that it would die so suddenly with no rough running or missing if it was hpop related, I have not heard of lpop (low pressure oil pump?)

I'll be right back.

 

I'm back, the HPOP is empty. What does that mean? LPOP?

I filled the reservoir, cranked the engine and still no start, but reservoir stayed full. Would the HPOP drain down from sitting for three weeks? If so, shouldn't it refill while cranking?

 

The low psi oil pump keeps the resivior full. The injectors rely on oil to run. There is probably air in the passage ways,may take some cranking. It should not of drained the hpop resivior. A melling lpop I believe is under 100$.

 

LPOP feeds the HPOP (I think). Hook up AE and have a look at your ICP in PSI while cranking. ICP wouldn't cause a no start (I don't think). The PCM just uses default tables IIRC.

EDIT: Also select RPM and note that as well as battery voltage.
EDIT AGAIN: And ICP duty cycle also

 

Your minivan pulling the stroke comment reminds me of a time I saw a John Deere lawn tractor pulling a dodge dually in LA. It was great!

 

ICP psi is about 32, duty cycle about 97% I think, engine rpms 145

 

What would cause the hpop res to be empty and not refill? And when filled manually still not start?

I'm thinking about replacing the IPR, but I hate throwing $200 at it for nothing...

 

What is your icp psi while cranking and your icp %? Needs to be at least 500 psi or the injectors won't fire. Here is some info I saved on starting:



This is a good "No Start" trouble shooting guide.
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Originally posted by Dave (Golfer) on PSN 01-20-2010 Thanks Dave

its nevvvvver the oil pump...seriously.

I see sooooooooooooooo many guys (dealerships included) that see "no ICP" or some ICP codes in a scantool...and toss HPOP's on truck after truck...when it is either an IPR or an injector (poppet valve) issue.

If you hook up the scantool, and monitor ICP (psi) while cranking...you'll see IPR% (duty cycle) climb & climb 15% key on..20, 30, 40, 55%, higher..the increase in IPR% means that the PCM is requesting ICP pressure to increase...

so ALSO watch ICP(psi) and if it comes up to only 180-250psi or so and stays there...then it's the IPR hung open (bypassing oil back to the oil pan through the front cover) such that only minimal psi can be made.

If the ICP is VERY low...like under 60psi...then it could be injector (poppets) pissing oil (under the VC's)..which is typical for injector with more than 180-200k miles.

if ICP climbs above 550-600..then it will probably climb much higher (15-1800+) and it is most likely going to be an electrical issue.

If his scantool will not connect then its a PCM or chip issue (remove the chip if you have one & haven't removed it yet)

if the scantool connects AND you have >600ICP then look at the datastream for a RPM reading.

if the scantool picks up an RPM signal and it seems accurate....then the CPS is good.

If no RPM on the scantool, replace CPS.

If you have RPM (on scantool, not just on dash)...AND have ICP >600, then run an (key on, eng off) injector "buzz test"...

the buzz test is nothing more than a continuity test from the PCM, through the IDM, and to & from each injector solenoid.

LISTEN to each inj buzz....do they all sound the same? nice & crisp?

if the test passes (and you audibly heard them all)...then wiring is good, IDM is good, HPOP is good...CPS is good...then it could be a fuel issue. gasoline, water, etc...

I wouldn't mention it if I haven't seen it myself numerous times...

any chance this no start began with 10-20miles after a fillup?

holler if you need help troubleshooting. take care~ Dave
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Hears some good info also:

7.3L Powerstroke Starting Requirements:
Battery voltage a minimum of 10.5 volts while cranking
RPM at least 100 while cranking. If no tach movement suspect CPS
If you have a scan tool ICP should be 500 PSI ± 25 PSI and fuel
pulse width should be 1 to 6 milliseconds.

The above requirements assume the following:

Correct oil level, oil type and pressure
Correct type of fuel
Correct fuel pressure (53 PSI per Ford spec)
Sufficient air supply (clean air filter & unobstructed intake)
Proper oil level in HPOP reservoir (1 to ¾ inch from top)
Proper glow plug relay and glow plug operation (in cold weather)
Proper injection timing (PCM controlled)

 

how long did you crank on it to try to get it to start? air in the lines will cause a hard/slow start accompanied by a rough idle for a little while. the lpop keeps oil in the hpop resivior.

 

ICP Duty cycle goes way up! (97%)
ICP psi is very low! (32 psi)
Injectors are re-manufactured stage 2s with about 5000 miles on them.
I had just filled up, about 20 miles before

Thanks for all the info, good stuff...

Since I added oil to the hpop 3 or 4 times for about 15 seconds each time, before that 5 - 10 times for about 15 seconds. Have had to charge the battery...