sputtering problem: (driving down the road, a soon as I get into 2nd gear, the constant sputtering begins)
-replaced fuel filter
-both fuel lines
-fuel pump, fuel sender checkout ok
-put water remover in tank, as well as injector cleaner (at different times)
-air filter is good
-doesnt sound like a misfire but not too sure on how to identify.

What else can the problem be? I am really at a loss and need some insight...what are symptoms of a failing cat converter?

Thanks to all

 

might want to read through this:
https://www.yotatech.com/forums/f116...ration-139265/

 

was going to suggest the same thread!

 

My story is similar to that one but not exactly the same. Instead of the sputtering then the power boost my rig is sputtering the entire time...(mainly 2nd gear and above) already replaced all the stuff noted...then when I left the garage it was running smoothly, then it started sputtering.

Can anyone tell me the symptoms of a misfire, what the engine will do and what the ride will feel like when driving? Not too sure if I am looking at fuel on engine issues.

Thanks

 

Tune-up? Plugs? Plug Wires? Air Filter? Dristibutor cap? Rotor button? Clutch?
_________________________________________________
95 Toyota 4runner SR5 V6 3.0 Automatic 4x4 151,000 Miles

 

a misfire will sound like a pulse if you listen to your exhaust coming out of the tailpipe. instead of being a smooth tone, it will have a sounds as if you were making a loud and quick "TH" sound with your mouth.

yesterday i sprayed a half a bottle of tb and intake cleaner into my intake, and the problem got much better, so tonight i am taking off the tb, and cleaning everything as best as i can. i will post my results.

 

As mentioned, a misfire will be heard as a sudden change in the exhaust sound coming out the tailpipe. You'll hear the 'hum' of the exhaust then a very short 'puff' sound then it'll go back to 'hum' then 'puff', 'puff', 'hum' etc.
Spark plugs, wires, distributor cap and rotor and coil are all possible causes of misfiring. Also, a slightly rich fuel mixture caused by incorrectly adjusted timing, throttle position sensor, air flow meter or dirty air filter can contribute to the problem as can the PCV valve, incorretly adjusted valves, a bad oxygen sensor, clogged fuel filter, bad injector, vacuum leaks, ad naseum.

There are many many causes of misfires and the best way to track it down is by selectively replacing or adjusting things- one at a time, until you isolate the cause... that is unless you've got an oscilloscope, exhaust gas analyzer and a myriad of other tools.

So, start with the cheapest things: plugs, wires, cap, rotor... they need changed periodically anyways. Then go towards other things, depending on how mechanically inclined you are, most all of the work can be done in the driveway.