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Bogs at throttle. CAN ANYONE HELP?

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Old Oct 10, 2019 | 03:38 PM
  #1  
xsfg's Avatar
xsfg
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Bogs at throttle. CAN ANYONE HELP?

Its 30 psi at the rail which makes me believe its the injectors. It was my fathers truck. Its an 89 f250 460. He passed. His girlfriend wanted to sell it for 50 bucks. I took it. She stole everything else.Any way, koer codes 12
21
41
18
77 or 78?
Koeo codes
32
96
It idles fine. Timing is good. But if i push the throttle it will bog down and the fuel pressure will drop unless i let off the gas. Ive replaced maf sensor, tps, fuel filter, fuel pump, passed the broken fuel switch diaphragm so im running off front tank. Also, does the maf vacuum go to the top or bottom throttle body nipple? Thanks.
 

Last edited by xsfg; Oct 10, 2019 at 03:50 PM. Reason: More info
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Old Oct 21, 2019 | 02:42 AM
  #2  
Mitch Huested's Avatar
Mitch Huested
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Joined: Oct 2019
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With today's fuel, injectors can clog up a bit, especially if it has been sittieng awhile. Remove them and soak them overnight in a good cleaning fluid. Personally, I like Hoppe's gun cleaner. It removes carbon and other harmful residue better than anything else I've used. If you have a sonic cleaner, drop them in and run it for a few hours with the Hoppe's. If you don't have one, just doak them overnight should be enough.
 
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Old Oct 21, 2019 | 02:45 AM
  #3  
Mitch Huested's Avatar
Mitch Huested
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One other thing, my fuel injection system runs a 57psi pump, you might check the manual and make sure your fuel pressure is per spec first.
 
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Old Oct 23, 2019 | 01:59 PM
  #4  
xsfg's Avatar
xsfg
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Thanks so much for the help. I just bought a new fuel pump today and i dont think the old one was bad. Im going to soak the injectors tomorrow or the day after. Will report back with what happens.
 
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Old Nov 3, 2019 | 07:33 PM
  #5  
J ballan's Avatar
J ballan
Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
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From: Saskatchewan
Originally Posted by xsfg
Its 30 psi at the rail which makes me believe its the injectors. It was my fathers truck. Its an 89 f250 460. He passed. His girlfriend wanted to sell it for 50 bucks. I took it. She stole everything else.Any way, koer codes 12
21
41
18
77 or 78?
Koeo codes
32
96
It idles fine. Timing is good. But if i push the throttle it will bog down and the fuel pressure will drop unless i let off the gas. Ive replaced maf sensor, tps, fuel filter, fuel pump, passed the broken fuel switch diaphragm so im running off front tank. Also, does the maf vacuum go to the top or bottom throttle body nipple? Thanks.
What’s the fuel pressure drop too if you keep it floored? If it drops I’d be looking at the fuel filter, pump, sock, etc not the injectors.
 
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