98 4.0 ohv ranger
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From: Guthrie center
98 4.0 ohv ranger
Trouble trouble trouble! Have a ranger 4.0 ohv with scorched cylinder 6, did an engine swap with 99 explorer 4.0 ohv...kept the original harness with the truck had to switch out cam position sycronizer to get correct pin sensor in(3 prong)...engine run poorly, idles smooth just no power upon acceleration. Underpowered! Yes synchro in installed correctly nothing coming up for codes but bank 1 sensor 2 ( which I put a new o2 sensor on and still comes up). Also vent for fuel. Which vac line was disconnected and plunged prior to ownership. Not the fuel getting the 44psi at the rail while running, not the injectors switched them out and never was a code of any sort, not the oil pressure or voltage as everything reads to spec!! I switched the engine again with a 97 explorer 4.0 using same electrical harness, same damn thing, isles smooth no power!! Could it be a harness as the o2 sensor ( bank 1 sensor two ) shows a code. I have inspected harness and cleaned connectors many times! Using two did a snapon high dollar code readers two did mechanics looking at this one, these guys are the best and still can’t figure it out, any ideas??
Welcome to the forum
Sensor 2 with O2 sensors is the sensor behind the Catalytic converter, it monitors if Cat converter is working to clean the exhaust, so can't effect engine performance
Bank 1 sensor 1, passenger side
Bank 2 sensor 1, drivers side
These are the O2s that tell computer if exhaust is lean or rich and they can effect performance, but not like you are describing
44psi fuel pressure is a little low, 55psi is spec, but I do not think that is the issue, if you raise RPMs does the fuel pressure drop?
If so change fuel filter and see if that helps
Do you have a Vacuum gauge?
test engine vacuum, should be 18-21" at idle
Blip the throttle, open it wide then let it slam shut
You should see vacuum drop to 0" then instantly come back up to 18"-21"
If its slow to drop and slow to return then you have a clogged exhaust system, so engine can't go to higher RPMs with any power, old air has to get out so NEW air(with fuel) can come in
Sensor 2 with O2 sensors is the sensor behind the Catalytic converter, it monitors if Cat converter is working to clean the exhaust, so can't effect engine performance
Bank 1 sensor 1, passenger side
Bank 2 sensor 1, drivers side
These are the O2s that tell computer if exhaust is lean or rich and they can effect performance, but not like you are describing
44psi fuel pressure is a little low, 55psi is spec, but I do not think that is the issue, if you raise RPMs does the fuel pressure drop?
If so change fuel filter and see if that helps
Do you have a Vacuum gauge?
test engine vacuum, should be 18-21" at idle
Blip the throttle, open it wide then let it slam shut
You should see vacuum drop to 0" then instantly come back up to 18"-21"
If its slow to drop and slow to return then you have a clogged exhaust system, so engine can't go to higher RPMs with any power, old air has to get out so NEW air(with fuel) can come in
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