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I drove 3 hours and got a new ipr. Truck starts now but duty cycle still drops to 4.6 and engine light comes on.
Wiring and connectors all look fine. I put a different pcm in and no change. Tomorrow I will take the chip out and see of that makes any difference
How is your fuel pressure? Here's a thread on a truck with similar symptoms. Never got the final word on this, but @Shake-N-Bake said he's seen this scenario cause by fuel starvation many times. The rig would run smooth for 20-30 seconds , then IPR drop to 4.6%, ICP up over 3Kpsi.
Is the fuel pressure still above 45psi when the IPR drops to 4.6%?
How is your fuel pressure? Here's a thread on a truck with similar symptoms. Never got the final word on this, but @Shake-N-Bake said he's seen this scenario cause by fuel starvation many times. The rig would run smooth for 20-30 seconds , then IPR drop to 4.6%, ICP up over 3Kpsi.
Is the fuel pressure still above 45psi when the IPR drops to 4.6%?
Can you read codes now that you've had it running with the SES light on again?
P1209 is the only one that comes up now
I have a new ipr
New ICP sensor
I put a known good ICP sensor in because I thought maybe the new sensor was bad.
What is making me pull my hair out is why once the engine oil gets good and hot icp and ipr goes back to normal and the truck runs perfect
Per the table posted by BWST above, P1209 is reporting a stuck IPR. Given that you bought a new one, that means there is a blockage somewhere in the HP oil circuit. Is the IPR genuine Ford/Motorcraft?
It shouldn't make much difference in this area but what model year is your truck so I look up the correct version of the shop manual?
A quick search yielded this so far:
The procedures are attached if the above leads you to the DC pinpoint tests.
Mobil 15w40 extreme synthetic
it's around 35 out now
I've never heard of "Mobil 15w40 extreme synthetic", but at 35 degrees, the owner's manual suggests 10W-30 might work better over the winter than 15W-40.
If you like synthetic, then a 5W-40 synthetic would be a good choice for winter.
Is that what you meant to type, 5W-40?
There can be a huge difference in cold start performance between 15W-40 and 5W-40.
I've never heard of "Mobil 15w40 extreme synthetic", but at 35 degrees, the owner's manual suggests 10W-30 might work better over the winter than 15W-40.
If you like synthetic, then a 5W-40 synthetic would be a good choice for winter.
Is that what you meant to type, 5W-40?
There can be a huge difference in cold start performance between 15W-40 and 5W-40.
I changed the new oil out for some mobil 5w40 full synthetic. No more check engine light and truck runs great at start up and idle.
ICP pressure right where it should be. But ipr is still at 4.6
I'd say your problem is solved. The PCM will command IPR DC to whatever it needs to be to get to desired ICP. Unless it is still throwing codes, be happy and enjoy your smooth running truck.
