EFI 460 help
Tuned
Joined: Sep 2014
Posts: 358
Likes: 7
From: Ky
Any troubleshooting section in any manual will have a list of symptoms, the symptoms you've outlined, that have to be systematically addressed, it's a vehicle, not the Shuttle.
But if it were the Shuttle for example, there is a scheduled periodic replacement of parts based on time, not breakdown.
Your truck is 30 yrs. old, and as such, if your going to keep it, anything you do is money in the bank from the stand point of an A&P wrench.
Anything original is ready to go!
If you have good compression on all cylinders, a full tune-up with plugs, cap/rotor and wires, you have to time that truck with the SPOUT shorting bar removed, per MANUAL, to 10 degrees TDC, then verify advance with the shorting bar installed to the manual's spec.
Eliminate any question of fuel shortage, ICM slowing failing, or PIP coil in distributor failing.
There are no shortcuts on old digitally-controlled vehicles.
But if it were the Shuttle for example, there is a scheduled periodic replacement of parts based on time, not breakdown.
Your truck is 30 yrs. old, and as such, if your going to keep it, anything you do is money in the bank from the stand point of an A&P wrench.
Anything original is ready to go!
If you have good compression on all cylinders, a full tune-up with plugs, cap/rotor and wires, you have to time that truck with the SPOUT shorting bar removed, per MANUAL, to 10 degrees TDC, then verify advance with the shorting bar installed to the manual's spec.
Eliminate any question of fuel shortage, ICM slowing failing, or PIP coil in distributor failing.
There are no shortcuts on old digitally-controlled vehicles.
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Originally Posted by vjsimone
Check your Dizzy shaft for play.
Take a close look at the electrodes inside the dizzy cap and the rotor button to see if they are are making contact due to play in the shaft.
Take a close look at the electrodes inside the dizzy cap and the rotor button to see if they are are making contact due to play in the shaft.
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Well I figured it must be a sensor that isn't throwing a code, like the TPS, maybe there is a dead spot in the sensor, or maybe when the TFI heats up it doesn't always want to work right. Anyone got any better ideas? Also, timing verified 10* BTDC
Tuned
Joined: Sep 2014
Posts: 358
Likes: 7
From: Ky
Have you done a fuel pressure leak-down test after engine shutdown?
Warm up engine to perform test, seems like a good idea.
Ford spec. is a hold of pressure/max leak-down not to exceed 2psi in 3 minutes (approx. didn't look it up).
Also when you refer to "TFI", I'm curious, the system is "TFI", I'm not aware of a particular component with that abbreviation.
When the truck is properly timed, the distributor-mounted "ICM" should be pointing forward, or slightly to the right, and no where near the thermostat housing.
Warm up engine to perform test, seems like a good idea.
Ford spec. is a hold of pressure/max leak-down not to exceed 2psi in 3 minutes (approx. didn't look it up).
Also when you refer to "TFI", I'm curious, the system is "TFI", I'm not aware of a particular component with that abbreviation.
When the truck is properly timed, the distributor-mounted "ICM" should be pointing forward, or slightly to the right, and no where near the thermostat housing.
FTE Chapter Leader
Joined: May 2006
Posts: 12,335
Likes: 1,312
From: Central Mississippi
TFI is "thick film intergrated ignition" which is how Ford describes it's type of ignition system in this generation vehicles.
Yes he technically should have referred to it as ICM.
No biggie.
Yes he technically should have referred to it as ICM.
No biggie.
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Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
It is a way of putting electronic components together.
Ford uses this way to manufacture the ICM.
Thick-film circuits are widely used in the automotive industry, both in sensors, e.g. mixture of fuel/air, pressure sensors, engine and gearbox controls, sensor for releasing airbags, ignitors to airbags; common is that high reliability is required, often extended temperature range also along massive thermocycling of circuits without failure.
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Originally Posted by TobaccoBarn460
Have you done a fuel pressure leak-down test after engine shutdown?
Warm up engine to perform test, seems like a good idea.
Ford spec. is a hold of pressure/max leak-down not to exceed 2psi in 3 minutes (approx. didn't look it up).
Also when you refer to "TFI", I'm curious, the system is "TFI", I'm not aware of a particular component with that abbreviation.
When the truck is properly timed, the distributor-mounted "ICM" should be pointing forward, or slightly to the right, and no where near the thermostat housing.
Warm up engine to perform test, seems like a good idea.
Ford spec. is a hold of pressure/max leak-down not to exceed 2psi in 3 minutes (approx. didn't look it up).
Also when you refer to "TFI", I'm curious, the system is "TFI", I'm not aware of a particular component with that abbreviation.
When the truck is properly timed, the distributor-mounted "ICM" should be pointing forward, or slightly to the right, and no where near the thermostat housing.
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Getting a bunch of sensors from a truck that ran great a few weeks ago tomorrow. I also found this: it is my symptoms exactly, and my front tank reads past full and my rear reads empty. I thought the sending unit only shows how much gas you have, it should not have anything to do with fuel pressure or rough running conditions. Any input? 
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
It is a separate circuit to the dash cluster. The only thing the sending unit has in common with the fuel pump is the grounding point.
A gauge that reads passes full has an open circuit to ground. A gauge that reads passed empty has a short to ground before the sending unit.
Note the EVTM page 84 below say just the other way around but I think it is wrong on the resistance.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
G801, LH (drivers side) inter fender behind headlamp.
Yes they do.
Both tank pumps should put out 8-11psi.
Where are you hooking the fuel gauge, the fuel pressure at the fuel rail should be about 40psi with pin #6 of the self-test plug grounded and the key on.
Attachment 285730
/
Yes they do.
Where are you hooking the fuel gauge, the fuel pressure at the fuel rail should be about 40psi with pin #6 of the self-test plug grounded and the key on.
Attachment 285730
/
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Looking around on the inner fender, all I am seeing is one small probably 14-16gauge wire grounding right next to the washer fluid reservoir. Is that it? Seems like it's too small to be that important. Any where else it would be? That's the only grounded wire I see behind the headlight housing.