Throttle body
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Tuned
Joined: Feb 2025
Posts: 299
Likes: 238
From: Brighton, IL
Throttle body
Greetings,
I have a 2002 F150 4.2 with 265,000 on the clock. It’s not licensed and I only drove it around the farm for firewood.
It sits for great lengths. It wouldn’t start. I disconnected the fuel line and put it in a plastic bottle. It pumps good fuel with the key is turned on.
If I disconnect air intake to the throttle body, and pour some gas in it, and reconnect the air intake, it will fire right up until starving itself of the force fed fuel.
I’ve never messed with a throttle body before. If I remove it, is there something I can clean up on it, blow out passages, or something else to get in running?
I’ve thought about scrapping out the truck but it’s nice to just have a beater on the property.
Advice is welcome. I’m always working on my F350 and 7.3 power stroke and thought maybe you all could help out. Thanks!
I have a 2002 F150 4.2 with 265,000 on the clock. It’s not licensed and I only drove it around the farm for firewood.
It sits for great lengths. It wouldn’t start. I disconnected the fuel line and put it in a plastic bottle. It pumps good fuel with the key is turned on.
If I disconnect air intake to the throttle body, and pour some gas in it, and reconnect the air intake, it will fire right up until starving itself of the force fed fuel.
I’ve never messed with a throttle body before. If I remove it, is there something I can clean up on it, blow out passages, or something else to get in running?
I’ve thought about scrapping out the truck but it’s nice to just have a beater on the property.
Advice is welcome. I’m always working on my F350 and 7.3 power stroke and thought maybe you all could help out. Thanks!
Fleet Mechanic
Joined: Jun 2023
Posts: 1,381
Likes: 383
From: WA
It wouldn't be a throttle body problem. The TB just controls air flow, the fuel injectors control fuel (gasoline) flow.
Is the THEFT light flashing? As I understand things the PATS (anti-theft) system on these years shut off fuel injection to stop theft. I don't know if they stop spark or not. But, either way, if the THEFT light is flashing the engine won't start. That would be the first thing to confirm.
Beside that, when it "doesn't start" do you mean it doesn't even give a pop or two? Completely dead? Or it catches a few times but won't stay running. You saw fuel flow but did not measure fuel pressure. The system needs around 35-40 psi to work right.
The 4.2 uses a really simple old early fuel injection system. It should be fixable.
Is the THEFT light flashing? As I understand things the PATS (anti-theft) system on these years shut off fuel injection to stop theft. I don't know if they stop spark or not. But, either way, if the THEFT light is flashing the engine won't start. That would be the first thing to confirm.
Beside that, when it "doesn't start" do you mean it doesn't even give a pop or two? Completely dead? Or it catches a few times but won't stay running. You saw fuel flow but did not measure fuel pressure. The system needs around 35-40 psi to work right.
The 4.2 uses a really simple old early fuel injection system. It should be fixable.
Thread Starter
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Tuned
Joined: Feb 2025
Posts: 299
Likes: 238
From: Brighton, IL
Right, no pop or anything. It acts like when a fuel pump is bad……I’ve replaced them on chevy 1/2 ton W/T in the tank.
No, I haven’t put a fuel pressure gage on it but fuel stream is forceful. Fills the plastic soda bottle fast!
The truck was running when I shut it off last before this issue. I know I have rodent damage so who knows.
ill check dash lights for “anti theft”
TY!
No, I haven’t put a fuel pressure gage on it but fuel stream is forceful. Fills the plastic soda bottle fast!
The truck was running when I shut it off last before this issue. I know I have rodent damage so who knows.
ill check dash lights for “anti theft”
TY!
Hotshot
Joined: Jul 2020
Posts: 10,534
Likes: 2,664
From: Near Salt Lake City
Buy a cheap scan tool online and scan it
Test the fuel quality
Make sure you can burn a house down with the stuff
Letting the truck sit is a considerable detriment
Consider driving it once a week at least or you will constantly have problems
Make sure the battery has aove 12 volts when you do try to start it
Repeated cranking will fire the injectors and fowl the spark plugs
Consider replacing the spark plugs and see how wet with fuel (or not) the old ones are
Test the fuel quality
Make sure you can burn a house down with the stuff
Letting the truck sit is a considerable detriment
Consider driving it once a week at least or you will constantly have problems
Make sure the battery has aove 12 volts when you do try to start it
Repeated cranking will fire the injectors and fowl the spark plugs
Consider replacing the spark plugs and see how wet with fuel (or not) the old ones are
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