7.3 stalls when warms up. Will not restart until cold. - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 08-18-2019, 11:40 AM Thread Starter
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7.3 stalls when warms up. Will not restart until cold.

Driving on freeway weeks ago and truck stalled. Assumed it was fuel filter and changed (was very dirty anyway). Truck did not start. Tow home.
Truck will start and idle when cold. No power. Can drive but stalls after 3 or 4 minutes driving or idling. Scanned with AutoEnginuity ScanTool and
only codes were for low voltage and others that were not cleared previously. Cleared codes for next test.
Changed CPS since that was the issue on my other 7.3. Same stalling as before. Wont run long enough to see real time data.
What should I do next? Thought about changing IPR and ICP. I am not fluent with the ScanTool so any advice would be good.
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post #2 of 16 Old 08-18-2019, 12:07 PM
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First thing to do would to be sure you're not low on Oil. Next, set up the AE to Graph ICP pressure, RPM, Voltage, and IPR %. Start the engine and let it die if it's going to. Now you can go back and look at the graph to see if the HPOP pressure (ICP) went low and if the IPR % was ramped up to compensate (this can be tricky because naturally the ICP is going to drop as the engine dies, so you need the RPM as a reference so you know when to ignore that pressure). Also, if the system Voltage gets too low the PCM might drop-out (since you have a code) so be sure it's not going below 8v or anything.

You've used the AE enough before to know it's configured properly and you have the Ford "Enhanced Package"? If there really are no codes then I would continue to look at Fuel Delivery... (no code gets set as it runs dry)
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post #3 of 16 Old 08-19-2019, 08:56 AM
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Sounds like you have leaking injector
o-ring(s), when the oil is cold and thick they seal, when it gets warm itís able to get past the o-rings. You can remove a valve cover and start the truck, look around all the injectors to see if oil is spraying out


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post #4 of 16 Old 08-20-2019, 09:41 AM
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Ipr is my guess. Like stated above , try to watch ipr duty cycle during no start condition. If it ramps up in the 60% range without an increase in ICP pressure, that would be your problem. When my ipr died it did the same thing. The magnet gets weak and gets heat soaked and let's go closing the valve. Will only start working when it cools down.

You cal also get the no start condition and pour some cold water on the ipr and see if that quickens how fast it will restart.

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post #5 of 16 Old 08-24-2019, 05:37 AM Thread Starter
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Finally got time to check this. Plugged in AE and started. Hard start as before and ran for about five minutes. ICP stayed at high 500s to high 600s when revving engine, hovered at 608 at idle. ICP% stayed around 13 - 15% until it started to slowly stall then rose to 17% before finally stalling. System voltage started at 12.8 and varied to 9.2 when stalling.
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post #6 of 16 Old 08-24-2019, 05:39 AM Thread Starter
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I did not see the % rise to anything near 60% during the whole test.
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post #7 of 16 Old 08-24-2019, 05:39 AM
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What was icp pressure and ipr duty cycle when trying to start it after stall?

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post #8 of 16 Old 08-24-2019, 06:00 AM Thread Starter
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Pressure was about 1900 and % about 57%.
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post #9 of 16 Old 08-25-2019, 01:43 PM
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And it wasn't running at that time?

Icp sensor have oil on it?

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post #10 of 16 Old 08-25-2019, 04:45 PM Thread Starter
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The engine was not running when I got those readings. And yes, the sensor connector has oil on it when unplugged. I checked my other 7.3l in the F-250 and it had oil on it also. I thought about exchanging them tomorrow to see if the problem follows the sensor. Sound logical or is there another idea brewing?
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