hey new here truck has major problems please help me out

[whiteboy91ranger]

ok i have a 91 ranger the 3.0 i know crappy motor anyways once warmed up it drives fine until i step on the gas once it gets about 4000rpms it cuts out and dies and wont start for and hour or so took it to a buddy's shop and obd1 said o2 sensor running lean this is what i have replaced

fuel pump
fuel filter
distributor cap
distribut0r rotor
spark plugs
sprark plug wires
air filter
cleaned the iac valve
checked and traced wiring for shorts or damage

fuel pressure was low yesterday changed the pump and worked great thoughti found the problem was very happy then later today started acting up and wanting to die after i step on the gas now idles real rough and low

when i disconnect the maf sensor idle turns up

no vacumm leaks

please help any input would help :rangertan::rangertan::rangerred::rangergreen:

 

[yeah61794]

Do the 3.0s have a fuel pressure regulator? If so that would be something to check out. Another possibility could be intake gasket. If that was leaking, it would induce a lean condition and rough running. Just a couple more things to check out.

 

[BrooklynBay]

Welcome to this forum! What are the code numbers?

 

[whiteboy91ranger]

thank you both for replying....not sure what codes..it just said o2 sensor running lean

 

[Sams01XplrSprt]

welcome

 

[steadyhand]

Not sure if you ever found the solution to this problem, but have you changed the O2 sensor? It does affect fuel delivery by monitoring oxygen content. If that doesn't fix it I would look into the MAF sensor. Assuming you have no spark or timing issue the only other thing I would suspect is a sensor is faulty and so the computer is trying to compensate with the fuel flow.

 

[whiteboy91ranger]

ok thanks ill try getting a new o2 do you know if it is easy to put in

 

[BrooklynBay]

Sometimes they get stuck in the exhaust system because of the heat. You might need to heat it up with a blow torch if that happens. Forcing it out might ruin the threads.

 

[steadyhand]

ok thanks ill try getting a new o2 do you know if it is easy to put in

Broolyn is right, some do get stuck and they are very hard to get out. You could get lucky. My explorer has 4 O2 sensors. I replaced both on bank 1. Sensor 1 was a nightmare. I never did get it out. I didn't have a torch so I had to take it to a shop. It was $25 for them to change it so it wasn't worth the hassle to do it myself. Sensor 2 was very easy to replace.

You never know what you'll get. For me, even when things seem to be going well I always have something go wrong. Maybe your luck is better than mine

 

[whiteboy91ranger]

thanks guys and yeah my truck keeps geting better with new parts and me cleaning some of the old parts but this problem is never ending i t just keeps comming back i think i fix it and it runs great for a day or 2 then whaamo it rus like ****