99 v10 losing power
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3rd Gear
Joined: Dec 2024
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99 v10 losing power
I've read a lot of posts but nothing seems to match up to what I'm experiencing, I'm 17 and I bought a 99 f350 with the v10 and noticed when I went up hills on the freeway it would lose power leaving me crawling at 40 mph and made a rattle/vibrating noise along with a misfire but it would go back to normal after a minute or 2. After a while it started doing it in town it would make a noticeable but slight misfire and vibrating noise before going completely bad and sounding like an old tractor. I've replaced the fuel filter, all 10 plugs, and 3 plug boots so then I tested it on the freeway and it did amazing but the next day it happened in town again but it had a some more power and wasn't missing as bad so I'm not sure what I shoukd check next any advice would be helpful thank you.
Tuned
Joined: Nov 2012
Posts: 253
Likes: 51
From: billings mt
check for a plugged cat converter. just open up the pipe before the cat, and take her for a spin, see how that is. itll be loud, but if its like mine, the heat and ping and loss of power will be gone
Laughing Gas
Joined: Dec 2019
Posts: 893
Likes: 255
From: San Diego, CA
You can test the operation of the cat using an IR thermometer (cheap and useful for other things). The rear of the cat should be ~150F hotter.
Does it seem like a fuel issue? Fuel pumps seem to be a common issue with these.
I take it no check engine light?
Does it seem like a fuel issue? Fuel pumps seem to be a common issue with these.
I take it no check engine light?
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3rd Gear
Joined: Dec 2024
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Thank you for your response Nope no check engine light and I have the exhaust cut off before the cat so it definitely can't be clogged lol is there a way to tell if the fuel pumps bad before I go out and buy a new one?
FTE Community Team
Joined: Dec 2023
Posts: 8,783
Likes: 4,237
From: sussex county, nj
welcome to the site
25 years old, unknown to us mileage i would also be leaning to the fuel pump failing , to test it there's a test fitting near the intake on the fuel lines , you might be able to rent a tester from autozone or local parts store .
what state are you in? truck have federal or CA emissions
25 years old, unknown to us mileage i would also be leaning to the fuel pump failing , to test it there's a test fitting near the intake on the fuel lines , you might be able to rent a tester from autozone or local parts store .
what state are you in? truck have federal or CA emissions
FTE Community Team
Joined: Dec 2023
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From: sussex county, nj
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Laughing Gas
Joined: Dec 2019
Posts: 893
Likes: 255
From: San Diego, CA
Fuel pressure test:
Should be 28-30 psi @ idle
38-40 psi with vacuum line disconnected from regulator @ idle
If no pressure change when disconnecting vacuum line, regulator could be bad
@ 2000RPM, pressure should read 38-40 psi
As always, those values are reference, anything near that should be OK.
Should be 28-30 psi @ idle
38-40 psi with vacuum line disconnected from regulator @ idle
If no pressure change when disconnecting vacuum line, regulator could be bad
@ 2000RPM, pressure should read 38-40 psi
As always, those values are reference, anything near that should be OK.
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