BIG Ignition Problem
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BIG Ignition Problem
I have searched the forums but cannot find this exact issue.
02 Excursion V10 4x4. Slight missing at times recently, but nothing too bad,and hadn’t gotten around to doing anything with it yet, as we only drive it a few times a month for hauling.
But now suddenly, it is nearly immobilized. Starts fine, revs fine, (with a very minor miss still there), put it in gear, idles ok, but when you add ANY load, eventouch the gas, with or without holding it still with the brakes, it dies. Instantly... it doesn’t stutter and die. It dies like you turned off the key. You can creep it along at idle speed, but touch the gas and poof.
The only codes are p0720 and p0722, which are the OSS. I have seen that mentioned as an “outlier”code when you actually have another issue. I suspect a bad COP or more, but I haven’t seen any posts where the thing won’t even move without dying. They are all seeking a fix for a minor miss or such while driving.
Pulled all COP wires one at a time at idle, (Not under load, no one to help me with that right now) and noticed rougher idle on every one.
Alternator is fairly new and putting out 14vdc. COPs are Accel and have maybe 20-30K miles on them.
Has anybody seen this?
Thanks.
02 Excursion V10 4x4. Slight missing at times recently, but nothing too bad,and hadn’t gotten around to doing anything with it yet, as we only drive it a few times a month for hauling.
But now suddenly, it is nearly immobilized. Starts fine, revs fine, (with a very minor miss still there), put it in gear, idles ok, but when you add ANY load, eventouch the gas, with or without holding it still with the brakes, it dies. Instantly... it doesn’t stutter and die. It dies like you turned off the key. You can creep it along at idle speed, but touch the gas and poof.
The only codes are p0720 and p0722, which are the OSS. I have seen that mentioned as an “outlier”code when you actually have another issue. I suspect a bad COP or more, but I haven’t seen any posts where the thing won’t even move without dying. They are all seeking a fix for a minor miss or such while driving.
Pulled all COP wires one at a time at idle, (Not under load, no one to help me with that right now) and noticed rougher idle on every one.
Alternator is fairly new and putting out 14vdc. COPs are Accel and have maybe 20-30K miles on them.
Has anybody seen this?
Thanks.
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
Does seem like a low fuel pressure problem, not really ignition.
A clogged CAT would allow some speed before loading up and killing power.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
Things I would check:
Hook up a vacuum gauge and record vacuum readings while idling and dying. These engines will die immediately if the of the 1" black hose is pulled off the intake tubing. Check PCV system make sure is good there. So you could have a substantial vacuum leak.
Fuel filter could be plugged, just put a new one on. Only takes a few dollars and 20 minutes to do.
Varify no one put e85 in tank or diesel fuel. Probably not diesel since it starts though.
Check fuel pressure at rail.
If those prove ok, start with cleaning throttle body and MAF sensor. Then check the IAC.
Hook up a vacuum gauge and record vacuum readings while idling and dying. These engines will die immediately if the of the 1" black hose is pulled off the intake tubing. Check PCV system make sure is good there. So you could have a substantial vacuum leak.
Fuel filter could be plugged, just put a new one on. Only takes a few dollars and 20 minutes to do.
Varify no one put e85 in tank or diesel fuel. Probably not diesel since it starts though.
Check fuel pressure at rail.
If those prove ok, start with cleaning throttle body and MAF sensor. Then check the IAC.
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Moderator
Joined: May 2004
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From: Home Base Nebraska
It could be a lot of things but the first thing that comes to mind is the boots, on my 2000 V10 they weren't sealing at the top and moisture would get down into the plug hole. It would idle but no go under load, 10 new boots and all was fine.
Denny
Denny
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Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
Still a very real possibility. Good suggestion.
Also, I learned the hard way that low transmission fluid levels in transmission can cause engine to die under load. Typically reverse. Not sitting in park or neutral and reving motor, but it's easy to check just in case.
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
There's some rerouting of fluid flow in reverse which may increase the load on the engine.
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Thanks
Thanks again to all for the suggestions.
So far I have cleaned up the ground connections and topped off the trans fluid.
I just picked up the boots and fuel filter, and I'll be working on those tomorrow.
So far I have cleaned up the ground connections and topped off the trans fluid.
I just picked up the boots and fuel filter, and I'll be working on those tomorrow.
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New User
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Fuel filter replaced. Not a fun job when you have no pavement and limited jacking ability! No change. Ignition work and fuel pump testing are next. (Need to get a fuel pressure tester.) Does anyone know where the pump is on this model? Posts and how-tos all say in the tank but the Ford manual says left frame rail.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
Fuel filter replaced. Not a fun job when you have no pavement and limited jacking ability! No change. Ignition work and fuel pump testing are next. (Need to get a fuel pressure tester.) Does anyone know where the pump is on this model? Posts and how-tos all say in the tank but the Ford manual says left frame rail.
Fuel pump is in tank.
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
Excursions also have a 44 gallon tank. Something your not going to want to drop unless it is low on fuel. Definitely test with a gauge off the fuel rail shrader valve first. Did you look at the PCV elbow under the throttle body? See video below. How many miles are on the engine?
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
I'm leaning toward fuel pump. I bet is way low on pressure and or volume. Rent a fuel pressure tester and check.
I wish there was an access hatch for fuel pump. Wonder how difficult it would be to make a good access hatch and fab up a cover?
I wish there was an access hatch for fuel pump. Wonder how difficult it would be to make a good access hatch and fab up a cover?