Fuel adjustment issues
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5th Wheeling
Joined: Feb 2023
Posts: 28
Likes: 2
Fuel adjustment issues
Hey everyone I am still fairly new to these IDI’s and can’t seem to figure out how to get more fuel outta my factory turbo’d 94?
I have adjusted the main fuel screw underneath the triangle plate, backed the torque screw all the way out till it’s literally hanging on by 2-3 threads and have even screwed the “minimax” screw all the way in too ! Nothing is helping me make more fuel. The truck doesn’t smoke when I floor it or anything thing unless I am revving it up while parked. My objective here isn’t to roll coal but it feels super lazy at higher rpm’s and I want more fuel for more power but at 15 psi I am at my limit. Any info can help me cause it’s driving me nuts. Really don’t wanna spend $2k on a performance pump if I am not at my max. Truck just has a wicked wheel 2 and that’s it !
I have adjusted the main fuel screw underneath the triangle plate, backed the torque screw all the way out till it’s literally hanging on by 2-3 threads and have even screwed the “minimax” screw all the way in too ! Nothing is helping me make more fuel. The truck doesn’t smoke when I floor it or anything thing unless I am revving it up while parked. My objective here isn’t to roll coal but it feels super lazy at higher rpm’s and I want more fuel for more power but at 15 psi I am at my limit. Any info can help me cause it’s driving me nuts. Really don’t wanna spend $2k on a performance pump if I am not at my max. Truck just has a wicked wheel 2 and that’s it !
Logistics Pro
Joined: Nov 2013
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From: Mojave, Ca
Check your fuel pressure by removing the schrader valve from the fuel filter and running a line inside the cab to a 0-15 psi gauge. What happens to your fuel pressure when your driving up a grade at full power? You should have 3-5 psi. If not, than your mechanical lift pump is getting weak.
Logistics Pro
Joined: Jun 2017
Posts: 3,978
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From: Edmond, OK
Do you have a pyrometer? I've read that you want to adjust the fuel delivery screw a maximum of two or three flats (60-180*). If you adjust it too much you'll roll coal constantly and suffer from high exhaust temps.
Be aware that the mechanical lift pumps are known to leak diesel into the crankcase. I'm going to change the 3rd one on my 6.9l IDI this weekend when I get a Facet Duralift pump I ordered.
Be aware that the mechanical lift pumps are known to leak diesel into the crankcase. I'm going to change the 3rd one on my 6.9l IDI this weekend when I get a Facet Duralift pump I ordered.
Thread Starter
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5th Wheeling
Joined: Feb 2023
Posts: 28
Likes: 2
Check your fuel pressure by removing the schrader valve from the fuel filter and running a line inside the cab to a 0-15 psi gauge. What happens to your fuel pressure when your driving up a grade at full power? You should have 3-5 psi. If not, than your mechanical lift pump is getting weak.
Do you have a pyrometer? I've read that you want to adjust the fuel delivery screw a maximum of two or three flats (60-180*). If you adjust it too much you'll roll coal constantly and suffer from high exhaust temps.
Be aware that the mechanical lift pumps are known to leak diesel into the crankcase. I'm going to change the 3rd one on my 6.9l IDI this weekend when I get a Facet Duralift pump I ordered.
Be aware that the mechanical lift pumps are known to leak diesel into the crankcase. I'm going to change the 3rd one on my 6.9l IDI this weekend when I get a Facet Duralift pump I ordered.
i have an egt gauge too and I have maxed out my Injection pump too and I still don’t smoke like you are mentioning. I believe I bottomed out the screw but it’s so tight I don’t wanna risk breaking it by tightening it if it is bottomed out. Full throttle carrying all that water and flooring it up a grade I barely see 1000ish degrees on my gauge.
does anybody have a pic of the screw bottomed
out ?
Logistics Pro
Joined: Jun 2017
Posts: 3,978
Likes: 514
From: Edmond, OK
Here's a good thread.
https://www.ford-trucks.com/forums/8...ctor-pump.html
Do you have a way to set the timing on your IDI? Apparently there's a second screw you can adjust that effects the IP timing.
https://www.ford-trucks.com/forums/8...ctor-pump.html
Do you have a way to set the timing on your IDI? Apparently there's a second screw you can adjust that effects the IP timing.
Thread Starter
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5th Wheeling
Joined: Feb 2023
Posts: 28
Likes: 2
Here's a good thread.
https://www.ford-trucks.com/forums/8...ctor-pump.html
Do you have a way to set the timing on your IDI? Apparently there's a second screw you can adjust that effects the IP timing.
https://www.ford-trucks.com/forums/8...ctor-pump.html
Do you have a way to set the timing on your IDI? Apparently there's a second screw you can adjust that effects the IP timing.
Thread Starter
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5th Wheeling
Joined: Feb 2023
Posts: 28
Likes: 2
So I brought the boost down at 8 psi and I can get it to smoke a tiny bit but only when I lug it. It still acts like it’s outta fuel above 2000ish rpm especially after 2500rpm. The truck use to leave little clouds of smoke when I use to floor it and now it doesn’t? Something is weird here !
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Logistics Pro
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From: Edmond, OK
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i ain't rite
Joined: Mar 2005
Posts: 65,564
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From: Marlboro Mental Hospital.
you descriptions of what you adjusted sounds like you did something seriously wrong. the fuel screw on the side of the pump under the cover should not be turned more than about 3-4 flats on the allen wrench( about 1/4 turn)
i have no idea what you are talking about with the torque or minimax screws.
i have no idea what you are talking about with the torque or minimax screws.
Thread Starter
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5th Wheeling
Joined: Feb 2023
Posts: 28
Likes: 2
you descriptions of what you adjusted sounds like you did something seriously wrong. the fuel screw on the side of the pump under the cover should not be turned more than about 3-4 flats on the allen wrench( about 1/4 turn)
i have no idea what you are talking about with the torque or minimax screws.
i have no idea what you are talking about with the torque or minimax screws.
i ain't rite
Joined: Mar 2005
Posts: 65,564
Likes: 5,601
From: Marlboro Mental Hospital.
i do know what i am talking about, i had 7 IDI powered trucks. 2 88's, 2 89,s a 90, a 91, and a 92 that i only had for 3 months. it was a pile and the dealer bought it back and the injector pumps on all of them only had one fuel adjustment screw that was under the plate
Logistics Pro
Joined: Jun 2017
Posts: 3,978
Likes: 514
From: Edmond, OK
The thread I linked mentions a second screw on the IP that can be adjusted. The problem is that unless you have a pyrometer, piezoelectric spark adapter and timing light you're just shooting in the dark doing any adjustments to the IP.
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