EFI 460 help
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
I'm surprised the fuel pump ground is that small. I'll see if I can improve the connection and go from there. Went to the JY to grab parts off the blown 460 and low and behold pretty much every sensor and the upper manifold was gone. Then I went to another good yard near where my grandpa lives as I was going to visit him, and found a 460. Grabbed the IAC, ICM, and tried to get the TPS but couldn't without stripping the screws so I left it. Eventually I will go back and grab it. Will update later today when new items are installed and fuel pump ground is investigated.
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Ok, update as promised: cleaned and installed IAC, no change, installed ICM, different part number, and from a 1997 460 but it appeared to have obd1 as some do. Black instead of the gray that was in there before. Also replaced idle stop screw, was all bent up before. Adjusted idle to corresponding .98v on TPS. Warm idle now at 1200. Will adjust both stop screw and TPS tomorrow. So far, truck seems to have lost its momentary hesitation when first hitting the gas. RPMs used to drop by 100 each time then climb as pedal increases. Also seems to do the same chugging when cold. I feel like it must have something to do with the TPS or ICM. Still wondering on the Fuel pumps, cleaned what I think may be the ground and no change.
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
NYE County, what symptoms do you have? What do your tanks put out? Do you have the 3 pump system or 2. Do your fuel gauges work? The more info the better. I also forgot to mention I will need to check for codes after changing all that I did.
New User
Joined: Jan 2012
Posts: 9
Likes: 0
Have you covered the basics such as plugs and wires? An old school trick was to start the vehicle in the dark and look under hood for worn wires arching where they shouldn't be.. Recently fixed a tip in throttle hesitation on a 93 ranger by doing this.. had a plug wire shorting from the boot to the head carbon tracking the plug... New plug and wire and the problem is fixed...
Tuned
Joined: Apr 2007
Posts: 372
Likes: 14
From: Central Minnesota
Fuel pressure will vary,, depending on manifold vacuum. It has to vary so the injector tip is always seeing the the same pressure. Hard to explain in a couple of sentences, but you think of an air compressor with 125# on the the gauge. With room air pressure, at sea level, about 15#, your blow gun tip sees 110# differential. Change the room pressure or the tank pressure the tip pressure changes, varying the air leaving the nozzle. As manifold pressure varies, dependent on engine the load, the vacuum line going to the pressure regulator on the the fuel rail varies the fuel pressure, thus insuring the correct amount of the fuel the engine was programmed for. Speed density fuel injection systems depend on the MAP sensor to run the "program". Mass air sensing was a tremendous improvement in later yeas, but the 460 only saw that in 1997 on CA trucks. Earlier post on the TPI sensor is something to look at along with the MAP sensor and the, even more likely the vacuum lines running to them..........
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Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Ok, update as promised: cleaned and installed IAC, no change, installed ICM, different part number, and from a 1997 460 but it appeared to have obd1 as some do. Black instead of the gray that was in there before. Also replaced idle stop screw, was all bent up before. Adjusted idle to corresponding .98v on TPS. Warm idle now at 1200. Will adjust both stop screw and TPS tomorrow. So far, truck seems to have lost its momentary hesitation when first hitting the gas. RPMs used to drop by 100 each time then climb as pedal increases. Also seems to do the same chugging when cold. I feel like it must have something to do with the TPS or ICM. Still wondering on the Fuel pumps, cleaned what I think may be the ground and no change.
See attached Stop screw adjustment procedure;
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Went to another JY for the ICM and TPS but never found a 460. On the plus side though, I was able to find the factory underhood toolbox for my 1986. Pretty psyched about that. Even the latch is still intact!
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
Well, since I last posted I ended up finding a kink in the fuel line between the high pressure pump and the selector valve. I also noticed I have a leak somewhere, every once and a while it will leave a small puddle underneath the truck. I'll have to investigate... I'm thinking it is for sure fuel related. Maybe it only starts to run crappy because after a while the pumps get too hot?
Tuned
Joined: Sep 2014
Posts: 358
Likes: 7
From: Ky
If your fuel leak is on the drivers side it, and it's intermittent, it is very likely the fuel selector valve.
Not sure if this could sometimes pull in air, maybe, the high pressure pump's draw may cause just that scenario.
Again, old parts on old trucks are a losing proposition, I wouldn't use JY parts personally when it comes to sensitive parts and a vehicles reliability.
Not sure if this could sometimes pull in air, maybe, the high pressure pump's draw may cause just that scenario.
Again, old parts on old trucks are a losing proposition, I wouldn't use JY parts personally when it comes to sensitive parts and a vehicles reliability.
Thread Starter
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Mountain Pass
Joined: Apr 2016
Posts: 241
Likes: 2
From: Duluth, Minnesota
May be my selector, never really thought about it. Leaks on the driver side it looks like. I'd rather trust JY OEM over the cheaper junk that isn't even tested these days. Always keep spares of the important stuff in the toolbox.