Yep, another NO START...code p2623 after HG job - Ford Powerstroke Diesel Forum
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Old 03-02-2013, 06:05 PM
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Yep, another NO START...code p2623 after HG job

So after putting new HG, Heads, studs, and injectors in found both batteries were bad when I tried restarting it.

Put new batteries in, hit the key and she finally fired up!

This is not the first time I've done this job (faulty ford heads) and the last time I did the job I put in new Oil cooler, EGR delete, IPR, ICP, FPR blue spring.

10000 miles before the first head job the HPOP failed so that was replaced about 29000 miles ago.

While I had it apart this time I pulled the oil cooler and noticed the screen had a bunch of s**t in it so I cleaned it. I also pulled the IPR and noticed 2-3 specs of metal on the screen so I did the best I could without pulling the screen to get them off.

Anyways, got her to fire after the head job and it idled for about 5 minutes and stalled...Won't restart. Hooked the scanner up and found that desired IPR was at 1526 psi and actual was 276 psi. I'm thinking HPO leak but found code p2623 IPR circuit open. So I checked the connection and found the connection was tight but...the connector on the IPR itself seemed loose

I know that the IPR has a goofy hook up and swivels but this seemed excessive. Wanted to see if a bad IPR would cause the low psi reading or if I should just pull the valve covers to look for leaks.

Another note: Recently have noticed before pulling the heads again that the dummy gauge takes a bit (10-30 seconds)

Any suggestions before I go full boar into this thing would be appreciated as I'm getting tired of playing with this monster (so is the wife).
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Old 08-15-2013, 07:15 PM
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Test the ipr control circuit wires pin 2 and pin 1 vpwr for excessive resistance/open short to power/ground, test ipr solenoid resistance between 3-15ohms usually 5.8ohms or so, if all that is good replace PCM
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Old 08-16-2013, 09:53 PM
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Kind had similar issue. Just resolved ad posted solution here on the thread I started. I have bee mm getting p0620 and p0623 codes for a while now.

Just realized it was a 2 instead of 0. The codes I had were unrelated

Last edited by ajfrac; 08-16-2013 at 09:59 PM. Reason: missed the 2
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Old 08-16-2013, 09:54 PM
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Here. Sorry

HG emergency
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