Won't fire back up

Jaredkeller96 · Oct 24, 2013

My truck is running again but she takes forever to start but once it's running does fine. Shut it off try to start it again does not start at all. Let it sit then she'll fire right up. What's going on??

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bad12jr · Oct 24, 2013

Sounds like a sticking IPR or injector o rings.

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ghohouston · Oct 24, 2013

My vote is bad/dirty ipr/bad ipr o rings. Does it only not start when the engine is warm?

Jaredkeller96 · Oct 24, 2013

ghohouston said:
My vote is bad/dirty ipr/bad ipr o rings. Does it only not start when the engine is warm?

Only starts after I let it sit, so that must be ipr??

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ghohouston · Oct 24, 2013

Not MUST, but is a good possibility

Jaredkeller96 · Oct 24, 2013

I'll see if I can possibly get a scanner on it

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Justin@DP-Tuner · Oct 24, 2013

Jaredkeller96 said:
I'll see if I can possibly get a scanner on it

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That is a good next step. Take a look at ICP/IPR duty cycle while cranking.

Jaredkeller96 · Oct 24, 2013

Justin@DP-Tuner said:
That is a good next step. Take a look at ICP/IPR duty cycle while cranking.

What kind of numbers should I be looking for??

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Jaredkeller96 · Oct 24, 2013

One of my friends that works at the local ford dealer gave me a new grey cps to try out also. Downloaded Ae software on my PC now just need to borrow the USB off my friend to run the icp and ipr levels

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Justin@DP-Tuner · Oct 25, 2013

Jaredkeller96 said:
What kind of numbers should I be looking for??

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Well the injectors need to see 500psi to start. However, if everything is working in good order, you will see around 2000psi in just a couple cranks before it fires.

Jaredkeller96 · Nov 4, 2013

got her on a snap on solsus today..hpop psi was around 300...well guess its time for a new hpop

littleredstroker · Nov 4, 2013

Jaredkeller96 said:
got her on a snap on solsus today..hpop psi was around 300...well guess its time for a new hpop

Or ipr... But go ahead and replace the more expensive part first.

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Jaredkeller96 · Nov 4, 2013

well as he explained it to me if the ipr was bad i wouldnt be seeing any psi for the hpop its okay cause my friend has a good 15* that i can prolly pick up core for core.. guy that looked at it is our local ford dealership diesel mechanic

littleredstroker · Nov 4, 2013

Jaredkeller96 said:
well as he explained it to me if the ipr was bad i wouldnt be seeing any psi for the hpop its okay cause my friend has a good 15* that i can prolly pick up core for core.. guy that looked at it is our local ford dealership diesel mechanic

My ipr **** the bed last week. It made 300 psi cranking ...

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littleredstroker · Nov 4, 2013

Jaredkeller96 said:
well as he explained it to me if the ipr was bad i wouldnt be seeing any psi for the hpop its okay cause my friend has a good 15* that i can prolly pick up core for core.. guy that looked at it is our local ford dealership diesel mechanic

If you can get it that cheap go for it... Bit dont.be incredibly surprised if it doesn't fix it

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ghohouston · Nov 5, 2013

The ipr can definitely be bad, and the pump will still output 300 psi...

Blowby · Nov 5, 2013

While you have the pump out clean the IPR and install new o-rings.

Jaredkeller96 · Nov 5, 2013

will do. my buddy is letting me have a good 15* for 50 and my core. cant beat that.

littleredstroker · Nov 6, 2013

Jaredkeller96 said:
will do. my buddy is letting me have a good 15* for 50 and my core. cant beat that.

I wouldn't do a thing to the ipr.... Just to.prove what good troubleshooting will do.

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mandkole · Nov 8, 2013

X2 to more troubleshooting... all that you know is that you have 300 psi during crank. The pump is pressurizing a hydraulic circuit--that is made up of at least 16-20 different orings with a regulator and feedback control.

As suggested, focus first on the IPR-- if its known good, confirm that rail pressure is held, then look at the pump last. But, if you want to just change parts and cross your fingers, you have that option also.