Looking for some advice on these monitor test results i got from obdble scanner. Car has weak acceleration and bucks whenever pushed past 3000 rpms. | Ford Explorer Forums

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Looking for some advice on these monitor test results i got from obdble scanner. Car has weak acceleration and bucks whenever pushed past 3000 rpms.

Balefire2000

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Joined
April 19, 2022
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City, State
Texas
Year, Model & Trim Level
1998 Ford explorer 4.0 v6
Also has pretty quick drop in fuel pressure after priming. Anddddd rather nasty exhaust smell.
Any advice is appreciated! Hopefully im not missing something incredibly obvious

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I should also mention its got a new ignition coil/ wires/ plugs. New injectors/fuel pressure regulator/fuel filter/fuel pump. All working good hopefully as its all oem and was tested prior to installation
 






not sure if this applies when the vehicle is running, but could the leakdown valve (not sure of its true name) on the pump be faulty? and whats the fuel pressure like when running and at various rpms? i am doubtful the exhaust issue would cause that large an issue, unless the o2s were really faulty... i think the fueling issue is more probable though
 






not sure if this applies when the vehicle is running, but could the leakdown valve (not sure of its true name) on the pump be faulty? and whats the fuel pressure like when running and at various rpms? i am doubtful the exhaust issue would cause that large an issue, unless the o2s were really faulty... i think the fueling issue is more probable though
So its honestly pretty low when primed (around 25psi) and when running its pretty steady at 40psi. I haven’t messed around too much at different rpms although during the little opening of the throttle plate that i did i found not a very big difference, still hovering around 40psi.
And this is still more pressure than i had before popping in the new pump. So unless the exhaust issue can bleed fuel pressure there’s something going on with the fuel line? Im honestly at a loss haha… anyways thanks for the response!
 






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