Hi all,
I have a 91 fj80 with a terrible miss under load.Plugs and wires are all fine,replaced fuel filter,still acts like it is starving for fuel.Rpms will come up if you accelerate slowly enough in neutral but if you tromp it it will spit and sputter.I suspected bad fuel from the start but have run deicer after warming up the truck inside a building and run injector cleaner with no luck.Have checked intake pipe for cracks and all vaccum lines and found nothing.It also will not start without a thorough preheating.I suspected an o2 sensor and ran it with right one disconnected (it ran worse) then disconnected left side,ran the same.I replaced left o2 sensor and still have same problem.I live in northern wisconsin and parts are not readily available plus the soonest I could find a place that could hook it up to a diagnostic computer was going to be two weeks.Then I fear they will change parts until they stumble on the problem.Effective but expensive and time consuming waiting for parts, Does anyone have an idea??
I have a 91 fj80 with a terrible miss under load.Plugs and wires are all fine,replaced fuel filter,still acts like it is starving for fuel.Rpms will come up if you accelerate slowly enough in neutral but if you tromp it it will spit and sputter.I suspected bad fuel from the start but have run deicer after warming up the truck inside a building and run injector cleaner with no luck.Have checked intake pipe for cracks and all vaccum lines and found nothing.It also will not start without a thorough preheating.I suspected an o2 sensor and ran it with right one disconnected (it ran worse) then disconnected left side,ran the same.I replaced left o2 sensor and still have same problem.I live in northern wisconsin and parts are not readily available plus the soonest I could find a place that could hook it up to a diagnostic computer was going to be two weeks.Then I fear they will change parts until they stumble on the problem.Effective but expensive and time consuming waiting for parts, Does anyone have an idea??