D Conner

[D Conner]

I have an 02 F350 7.3 I am getting over max IPR reading when under a load. It only does this when it is programed for heavy tow. I am using a Super Chip tuner. The engine has new injector pump, fuel pressure regulator, ICP sensor, and IPR valve. Does any one have any ideas as to why it is only doing this when it is programed? When it is not programed all readings are normal.

[JSchuricht]

Not sure where your getting a over max IPR reading but it's common for the SES to go off for ICP during heavy acceleration while running a tune. It's usually caused by the HPOP not keeping up with demand but it doesn't really anything. You should hook up a good scanner and check ICP and IPR duty cycle. That would help us to narrow it down.

[D Conner]

The reading was taken with a Ford mechanic sitting beside me in my truck with all of his equipment set up. I was pulling an 8000 lb trailer at the time. The pressure was still climbing when he told me to back off

[JSchuricht]

Still need to know what IPC and duty cycle are. The duty cycle will show how restrictive the IPR is being and the IPC will show if it's still getting flow. Could be a bad connection, bad part or a bad mechanic since you don't have a injector pump.

[D Conner]

If it's not an injector pump, what is it called? On the parts list it reads pump assembly-fuel injection. I don't have the information on duty cycle. What ever duty cycle is it was never mentioned during the testing

[JSchuricht]

The 7.3 is a HEUI injection system, injection pumps didn't show up in the powerstroke till the 6.4 and 6.7. You have two mechanical oil pumps and a electric fuel pump. It's possible that your mechanic meant the HPOP or High Pressure Oil Pump which contains the IPR and is what ICP measures. It kinda sounds like your mechanic doesn't understand how the 7.3 works and how a tuner affects ICP. Here is some info on how it works.

Your ICP should be about 500 at idle and can go over 3000 with good tuning and a strong HPOP. IPR will vary depending on demand and health of the HPOP. It is common for tuners to call for 3000+ psi at WOT Wide Open Throttle and the stock HPOP not keep up. This would set a SES Service Engine Soon light that clears after a few minutes. It doesn't harm anything, just means you aren't getting 100% out of your tune.

[D Conner]

On the injection pump issue, I am only going on what Ford calls it. My main concern is the fact that my ck eng lt comes on and stays on when programed and under a load when it didn't before I had the work done.