[Jonathan57]

Good Morning.
We've got a 02 f250 7.3 2wd

While pulling a large 5th wheel this weekend the truck started to die out. Basically, it warms up and dies out. Then we would let it cool down for 2-3 hours and it'll start up again, only to die once it warms up. With or without the trailer.

We have replaced the cps and icp.

What are your thoughts? I hate to be chasing it down with new parts $$$$

Thanks!

Jonathan

 

[yan7gin]

Do you have a scanner powerstroke capable to scan the truck?

Normally when the truck dies when warm and start right back up when cold its the IPR


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[Jonathan57]

We have the basic scanner. It gave codes 1211 then 1212. Now it gives 603

 

[Maryland dieselnick]

Hi, your truck is on board dat 2 but is non compliant, so you need a Powerstroke capable scanner like Autoenguinity with the ford enhanced pkg.
Is this a fade out in power or instant lights out.
As Yan pointed out the ipr( injection pressure regulator)has an electromagnetic coil on it. Some fail but once coil will work again.
A cps( camshaft position sensor) will do this as well.

 

[ArcticDriver]

When you replaced your ICP, did you inspect the pigtail for any signs of oil? Its common for a failed ICP to leak oil to the pigtail. The wiring needs to be dry to function properly.

 

[Jonathan57]

Thanks for the replies

Yes. When I replaced the ICP the connection was dirty. It's now clean. Still having the issues.

I'm thinking the IPR is next on the list. Is there a way to check it without buying a new one?

 

[Greg03PSD]

Thanks for the replies

Yes. When I replaced the ICP the connection was dirty. It's now clean. Still having the issues.

I'm thinking the IPR is next on the list. Is there a way to check it without buying a new one?

Find a buddy with a 7.3 and see if you can swap the IPR temporarily. If you don't have a buddy with a 7.3, you could also measure the solenoid coil resistance cold and hot. If there is a big change, or very high resistance when hot, your coil is probably shot.


You would need a monitoring tool like AutoEnginuity to do this, but you could monitor ICP and IPR duty cycle as the engine heats up. If your ICP all of the sudden takes a dive when hot, it could be the IPR.

 

[bugman]

Without a scanner it appears to be pointing to the IPR.

When the oil is cool and a little bit thicker everything is find but when the oil warms up it thins out to the point that it is causing the IPR not to function properly.

How old is the oil and what are you running for oil?

 

[yan7gin]

I think you can remove it and try to clean it


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[blue99stroker]

You can rebuild the ipr and clean it.

Check to see if the tin nut is on the back of the ipr

 

[Jonathan57]

So I pulled the IPR and cleaned it really good. It did not seem to have any junk or gunk in it, but now it is clean.

I've still got the same issue. As soon as it warms up it completely dies. When it does run it runs really good.

 

[klhansen]

Check the resistance across the IPR coil terminals. It should be between 5 and 20 ohms. If it's out of spec then you need a new IPR (coil isn't sold separately). If it checks out OK, then run it till it dies, and check the resistance again, before it cools off. Most likely you'll find it open circuit or very high resistance. If so, then you need a new IPR.


To check it on the engine, you should get a pigtail connector so all you need to do is unplug the harness connector, plug in your pigtail and check across the two wires on the pigtail. That way you won't need to dig down in the valley with your meter probes on a hot engine.

 

[Jonathan57]

Well the truck is fixed!!

It was the HPOP. Luckily we found one at a truck dismanteler for $300 with IPR.


THanks for your help! This forum is great.

 

[petwolf]

Ok so how did you find out it was the HPOP? I mean I'm glad your truck is good again, just curious as to how you arrived at that conclusion?

 

[ArcticDriver]

Thats great news you fixed it.

Just trying to narrow it down but if you replaced IPR and HPOP at the same time, what makes you think it was the HPOP?
Did other troubleshooting point to the HPOP?

Just trying to better understand our trucks ;-)

Thanks

 

[yan7gin]

Thats great news you fixed it.



Just trying to narrow it down but if you replaced IPR and HPOP at the same time, what makes you think it was the HPOP?

Did other troubleshooting point to the HPOP?



Just trying to better understand our trucks ;-)



Thanks

I was thinking the same thing


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[klhansen]

^ X3


HPOPs are really pretty durable, but they do fail occasionally. It is rare however. If it would start and run till it got hot, I can't see how that would be affected by the HPOP internals. It would generally either be bad, marginal (running like crap all the time), or good, NOT good and then bad. I suspect since the IPR was changed along with the HPOP, that the real culprit was the IPR.