1987 Nissan Pathfinder-Catalytic Converter question

Tiny
WBFIG
  • MEMBER
  • 1987 NISSAN PATHFINDER
I have a 1987 Nissan Pathfinder. It has the 6 cyclinder engine, is 4X4. My problem is this. While driving, its almost like its flooding or something. Ill be going, then itll stop accelerating. If I pump on the gas pedal sometimes it helps, but it will do it again 30 seconds later. I have already replaced my fuel filter, distributor cap, rotor, plugs, wires, and the distrubotr itself(i dunno my own strength). The way I describe my problem, is its like when you are using a gas powered weed eater, and you leave it in full choke and give it gas. How it speeds up, but has no power and bogs down a bit. My question is, could it be my catalytic converter. I bought the vehicle in New Hampshire, and it does have a good bit of rust dmg underneat. It has already burned through my floorboard under the driver feet area. I replaced my exhaust, it needed it, hoping that would help, but it didnt for long. If it could be the converter, how hard would it be to change myself? Im far from being a mechanic, but I do routine maint. Myself-the above stuff, oil changes, brake pad changes, etc. Any information would be really appreciated.
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Wednesday, April 11th, 2007 AT 6:06 PM

5 Replies

Tiny
JACK42
  • MEMBER
Could be the cats, but might be a mixture problem cooking them as described by the burning carpet. Any check engine light? O2 sensors ever been replaced assuming it has been tuned up with OEM parts already. MAF sensor isnt out of the question either
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Thursday, April 12th, 2007 AT 8:26 AM
Tiny
WBFIG
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No check engine light has come on since ive owned it. I havent changed the O2 sensor yet. Will do that next. What is the MAF sensor, and where would it be located around? Thanks again
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Thursday, April 12th, 2007 AT 6:46 PM
Tiny
RASMATAZ
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The MAF sensor tells the computer how much air the engine is drawing in as it runs to further adjust the fuel mixture as the load changes.

Location: normally placed at the air cleaner housing.
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Friday, April 13th, 2007 AT 5:43 AM
Tiny
WBFIG
  • MEMBER
Is something new happening. Used to it didnt do it till I hit about 30 or so, now it seems to do it real bad right when its about to shift from 1st to second and then its pretty much nonstop the whole time. I can keep it accelerating by lightly tapping the gas, but it stills does the whole no power and surging thing. I have an O2 sensor ordered, damn thing is almost 1/3 what I paid for the vehicle. If this changes the diagnosis any, lemme know.

Thanks again,
wbfig
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Saturday, April 14th, 2007 AT 3:59 PM
Tiny
RASMATAZ
  • MEMBER
Try adjusting the throttle position sensor, BTW its an Airflow meter not a MAF sensor.

Could also do a fuel pressure check-whether the pressure is being maintain by the regulator or pump pushing the correct pressure.
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Saturday, April 14th, 2007 AT 8:03 PM

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