bad hpop
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Unplugging the icp puts it in default reading of 650 koeo or at idle, and then it will bump up if its running. 90 psi sounds like a bad ipr, but could be a blown out injector to rail seal as well. You will have to air test it to determine whats going on.
You didnt say what year truck, but the 05 and up pumps dont die as much as the early pumps. If you have an earl build (03-early 04), youll have to pull a valve cover to airtest.
You didnt say what year truck, but the 05 and up pumps dont die as much as the early pumps. If you have an earl build (03-early 04), youll have to pull a valve cover to airtest.
swinky
New member
Pull a valve cover to air test? That's not accurate.
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dsberman94
Well-known member
Sounds like ipr gone bad. It's just going to leave you stranded again until you replace it.
dsberman94
Well-known member
i forgot to mention, if its defaulting to 650, it should be starting. If its not the ipr is not functioning properly with hot oil and its allowing all the psi to go back to the pan and not to the oil rails where it needs to.
Nick7.3
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If you unplug the icp and it starts is that usually a bad icp?
dsberman94
Well-known member
Could be. Reason being is its defaulting to an acceptable level of pressure. Try leaving it running with it unplugged and plugging it back in and seeing what it does. If it's the same sensor as a 7.3 runs, the telltale sign that it's bad is that it has oil in the connector.
It wouldn't run with or without it. I put a new ipr valve in it it started and seemed fine. There was some trash in it when I pulled it out. Idled at like 700-750 psi. I let it idle for a few minutes shut it off for an hour or so. Now it only gets up to 320psi and still won't start with the icp sensor removed and reads 920 when I do that
Where do you air test early builds? Ive never had luck trying to get back in the icp port, even with the turbo off. I have had to use a rubber tipped nozzle on the discharge tube on the pump to find hard to find leaks, but typically the valve cover comes off and one of the little plugs gets pulled to put an adapter in.
Have you air ested yet? You could have a dummy plug shot to hell, an injector seal gone, or the stc blown out.
