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Are these oxygen sensors no good?

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Any who, it’s looking like the fuel pump. No kinked fuel lines, everything was hooked up correctly, once the oxygen sensors and the rest of the cats were hooked back up it stopped throwing a code for the oxygen sensors (duh) previous fuel pump had a warranty but I tried to get it across that you get what you pay for. My fuel pump was $250 and hers was over a hundred dollars less. Pressure is still very weak at the shredder valve. I’m not thinking anything like dead fuel injector or a clogged one because it should still have the pressure or be leaking. O2 sensors are $20-$30 not too bad so I was just going to get her fuel pump from the warranty and new oxygen sensors. Nothing else to narrow it down too. After hollowing out the cats her idle was perfect again but it’s still showing it’s running lean and it’s still topping out at 65mph.
 


1990RangerinSK

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Any who, it’s looking like the fuel pump. No kinked fuel lines, everything was hooked up correctly, once the oxygen sensors and the rest of the cats were hooked back up it stopped throwing a code for the oxygen sensors (duh) previous fuel pump had a warranty but I tried to get it across that you get what you pay for. My fuel pump was $250 and hers was over a hundred dollars less. Pressure is still very weak at the shredder valve. I’m not thinking anything like dead fuel injector or a clogged one because it should still have the pressure or be leaking. O2 sensors are $20-$30 not too bad so I was just going to get her fuel pump from the warranty and new oxygen sensors. Nothing else to narrow it down too. After hollowing out the cats her idle was perfect again but it’s still showing it’s running lean and it’s still topping out at 65mph.
I'm assuming you replaced the in tank (low pressure) pump. Could the high pressure (it's on the frame rail, left side, forward of the Drivers' door, IIRC) pump be bad?
 

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I'm assuming you replaced the in tank (low pressure) pump. Could the high pressure (it's on the frame rail, left side, forward of the Drivers' door, IIRC) pump be bad?
An 00 won't have that setup. 88 was the last year for the dual pumps on the Rangers, everything after that just has a single high pressure unit in the tank.
 

1990RangerinSK

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An 00 won't have that setup. 88 was the last year for the dual pumps on the Rangers, everything after that just has a single high pressure unit in the tank.
Oh. I thought that was a common thing (and not just on Rangers) for fuel injected vehicles.
 

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The new fancy direct injection vehicles to have two pumps but kinda rare for regular fuel injected cars.
 

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Oh. I thought that was a common thing (and not just on Rangers) for fuel injected vehicles.
Ford used that system in the late 80s and into the mid 90s on vehicles that had dual fuel tanks as an option. Most cars never had such a setup. The Broncos and B2s had it because they were built off the truck platforms and mimicked their construction.

The new fancy direct injection vehicles to have two pumps but kinda rare for regular fuel injected cars.
Well yes, but that is about where the similarities end. The old system on the Rangers had two electric pumps wired in parallel. The GDI cars have a 35-70 PSI electric pump in the tank feeding a mechanical high pressure unit driven off a cam.
 

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Ford used that system in the late 80s and into the mid 90s on vehicles that had dual fuel tanks as an option. Most cars never had such a setup. The Broncos and B2s had it because they were built off the truck platforms and mimicked their construction.



Well yes, but that is about where the similarities end. The old system on the Rangers had two electric pumps wired in parallel. The GDI cars have a 35-70 PSI electric pump in the tank feeding a mechanical high pressure unit driven off a cam.
How.

Do you remember.

This. Much. Crap?
 

adsm08

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How.

Do you remember.

This. Much. Crap?
I am a Ford senior master tech, working at a dealership, specializing in gas engine drivability. Knowing these things is literally my job.

I've also built two 80s RBVs from the ground up mixing the original engine management wiring and fuel systems with later stuff.
 
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I'm assuming you replaced the in tank (low pressure) pump. Could the high pressure (it's on the frame rail, left side, forward of the Drivers' door, IIRC) pump be bad?
Intank fuel pump was replaced. Her truck works just like it did out the factory. was a combination of clogged cats, fuel pump, and a useless boyfriend.
 

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