POST MOD ISSUES - HELP
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
Just letting it sit and idle is NOT good for the motor. Bad for the EGR if you have it and wet stacking can occur. If you are concerned with getting the air out of the HPO system, three medium/hard throttle runs will normally get that done and you've already done that.
Did you replace the HPOP? I'm sorry but I don't remember. Do you normally park on an incline and nose up or down?
Did you replace the HPOP? I'm sorry but I don't remember. Do you normally park on an incline and nose up or down?
Thread Starter
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Senior User
Joined: Oct 2013
Posts: 128
Likes: 0
From: NW Arkansas
TEST
So when the screenshot with 800+ was taken truck would start, now it's less than 400?
Yes, a weak IPR can cause a no start. We mostly think of it binding or getting the screen stuck in it but the electrical side is subject to fail also. Her's a way to test it.
IPR TESTING WITH A DVM
Pull out the middle PCM connector and ohm out pin #2 of the PCM connector (yellow with red stripe coloured wire) to the positive terminal of the driver side battery at key-on/engine-off. A good IPR should read about 6.0 ohms
Yes, a weak IPR can cause a no start. We mostly think of it binding or getting the screen stuck in it but the electrical side is subject to fail also. Her's a way to test it.
IPR TESTING WITH A DVM
Pull out the middle PCM connector and ohm out pin #2 of the PCM connector (yellow with red stripe coloured wire) to the positive terminal of the driver side battery at key-on/engine-off. A good IPR should read about 6.0 ohms
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Senior User
Joined: Oct 2013
Posts: 128
Likes: 0
From: NW Arkansas
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Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
Just for grins and giggles try parking it nose down when you shut down and see if you still have the long crank to starts hot.
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Senior User
Joined: Oct 2013
Posts: 128
Likes: 0
From: NW Arkansas
Thanks for the pinout. Now I see why it is Pin #2. Thanks!!!
I can try that. What will it tell us?
I can try that. What will it tell us?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Here's another good print of the under hood wiring. IPR circuit is straight forward. If IPR is 0 ohm that would be a problem (shorted) if it didn't read anything (blank) it's an open circuit. Check for good connection at the IPR and read back each way while jiggling the wires a little. If you can get your Leads directly on IPR to verify it's good/bad. The way it's acting I would suspect wiring.
Under hood wiring diagram
https://www.ford-trucks.com/ford-man...%20diagram.pdf
Under hood wiring diagram
https://www.ford-trucks.com/ford-man...%20diagram.pdf