Stumble / Stall at idle
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Mountain Pass
Joined: Mar 2005
Posts: 138
Likes: 0
From: The ATL
Stumble / Stall at idle
Hi Folks! Hoping someone here has an idea for what this might be and can point me to where to start looking.
2000 Excursion with nearly 450K on the clock.
The truck occasionally will stumble and sometimes stall out when idling (like at a stop light). It'll start back up every time. I'm not totally sure, but it seems to happen more often if I've turned the truck on and off several times in a short amount of time. It doesn't do this all the time and doesn't seem to do it at all once I've driven for more than 15-20 minutes. I checked with Torque Pro and I can see the HPOP pressure (which is normally ~500psi at idle give or take) fluctuating when she's stumbling. The pressure will drop to 200psi or so, the computer or whatever will blip the throttle and pressure will shoot up to ~1000psi and she'll hunt around like this for a moment and sometimes just turn off.
In the last few months I've replaced the following;
HPOP - T500
ICP, IPR & CPS - Ford Motorcraft from Amazon
ICP & IPR pigtails
Fuel pump - Bosch
In the last couple of years I've;
Removed, disassembled, cleaned, shimmed and reinstalled the injectors with new o-rings
Replaced the injector cups
Re-sealed the plenums
Rebuilt the original turbo
Bellowed up-pipes
Removed the in-tank fuel screens
Thanks in advance for any helpful replies!
2000 Excursion with nearly 450K on the clock.
The truck occasionally will stumble and sometimes stall out when idling (like at a stop light). It'll start back up every time. I'm not totally sure, but it seems to happen more often if I've turned the truck on and off several times in a short amount of time. It doesn't do this all the time and doesn't seem to do it at all once I've driven for more than 15-20 minutes. I checked with Torque Pro and I can see the HPOP pressure (which is normally ~500psi at idle give or take) fluctuating when she's stumbling. The pressure will drop to 200psi or so, the computer or whatever will blip the throttle and pressure will shoot up to ~1000psi and she'll hunt around like this for a moment and sometimes just turn off.
In the last few months I've replaced the following;
HPOP - T500
ICP, IPR & CPS - Ford Motorcraft from Amazon
ICP & IPR pigtails
Fuel pump - Bosch
In the last couple of years I've;
Removed, disassembled, cleaned, shimmed and reinstalled the injectors with new o-rings
Replaced the injector cups
Re-sealed the plenums
Rebuilt the original turbo
Bellowed up-pipes
Removed the in-tank fuel screens
Thanks in advance for any helpful replies!
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
May try running w/ icp sensor unplugged to see if things change any. Your description sounds like the pcm is loosing control of the hpo though. Possibly failing ipr coil or the valve needs cleaning
Thread Starter
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Mountain Pass
Joined: Mar 2005
Posts: 138
Likes: 0
From: The ATL
I actually worried about this very thing. I don't know how to be sure. I'm a cheap b@$t@rd but one day maybe I'll learn that it's less expensive to pay more for the right part the first time rather than the second time.
Cargo Master
Joined: Apr 2022
Posts: 3,196
Likes: 1,698
That's not to say their not catching on and changing packaging to match real Motorcraft more though.
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