Need help! 91 Land Cruiser (1 Viewer)

[1923nated]

Need help with my 91 cruiser, got the gas tank, sending unit and fuel pump done and ran fine for 1,000 miles, then started acting up and running rough, changed the fuel filter and it’s still doing it, acts like it wants to stall and does sometimes, it will drive but I have to put the pedal to the floor and feel like it will barely go above 30mph, until it shifts and then it will but still losing power and sounds like it’s misfiring, my exhaust is shot and getting that done this week but i don’t think that’s the culprit as it still ran ok for the 1,000 miles after, and help would be greatly appreciated! As it has been damn near impossible to find a decent mechanic that knows how to diagnose or half asses the work I tell them to do

 

[NeverFinis]

Is your exhaust shot before or after the O2 sensor.

Did you replace the fuel pump sock when you did the fuel pump?

 

[1923nated]

Is your exhaust shot before or after the O2 sensor.

Did you replace the fuel pump sock when you did the fuel pump?

It’s shot right down from the headers under the drivers side, I don’t know what the mechanic did other than the fuel pump I thought he did the sock as well but I don’t k ow at this point if he did or not. I’m starting to question it, I have 2 people tell me they think it’s the fuel pump is shot, so im trying to get ahold of the mechanic that did the work to find out what he did

 

[Izeloz]

Are there any codes? Sometimes the check engine light won't come on with stored codes. Find the diagnostic connector under the hood on the firewall on the passenger side and use a paperclip (or something similar) and short the TE1 and E1 terminals (should be labeled). Put the key in the ignition in the "on" position (not running) and count the flashes of the check engine light. Then Google the resulting code(s). If it's all clear, then go to your local parts store and rent a fuel pressure tester. Do you have a FSM? It's much better to test stuff rather than throw parts at it.

 

[1923nated]

Are there any codes? Sometimes the check engine light won't come on with stored codes. Find the diagnostic connector under the hood on the firewall on the passenger side and use a paperclip (or something similar) and short the TE1 and E1 terminals (should be labeled). Put the key in the ignition in the "on" position (not running) and count the flashes of the check engine light. Then Google the resulting code(s). If it's all clear, then go to your local parts store and rent a fuel pressure tester. Do you have a FSM? It's much better to test stuff rather than throw parts at it.

I have a friend gonna test the pump today and he’s gonna do the exhaust for me, I’m just completely stumped right now, I wouldn’t think the fuel pump would give out at 1,000 miles

 

[jonheld]

The Toyota FSM (factory service manual) has diagnostics and explanations for every system. It should be the very first thing you turn to. It is available for free in the resources section.

That said, the top end of the 3FE wants to be air tight. Any unmetered air will play havoc with A/F ratio.
Obvious things would be a tear in the intake plenum, loose oil fill cap/gasket, etc.

You can also reach out to your local Land Cruiser club for mechanic recommendations as opposed to hoping for the best.

 

[NeverFinis]

It’s shot right down from the headers under the drivers side, I don’t know what the mechanic did other than the fuel pump I thought he did the sock as well but I don’t k ow at this point if he did or not. I’m starting to question it, I have 2 people tell me they think it’s the fuel pump is shot, so im trying to get ahold of the mechanic that did the work to find out what he did

Your O2 sensor is probably picking up excess air, causing your motor to run very rich. Fix the exhaust and then go from there. As others wrote, read the codes and download the FSM.

Good quality fuel pumps rarely fail.

 

[ppc]

What brand of fuel pump did your mechanic install?
There are a bunch of cheaply made pumps that don't have the same reliability as OEM.
There is a term called "baby failure rate" which your new pump could experiencing. A failure early on can happen or it may live for a long time.
Bottom line assuming a new part is not going to fail is a poor assumption. Test it before wasting time or money on other things.
G