99 4 Runner Bogging down over 30mph

Tiny
ABRANNAM
  • MEMBER
  • 1999 TOYOTA 4RUNNER
My 1999 Toyota 4 Runner SR5 with the v6 AT 106000 miles was coding that it was running lean. We changed both Oxygen sensors and now per the computer there are no problems. If you apply the gas quickly or try to go up a hill it boggs down almost like it is flooded and will not go over 20 miles an hour. My mechanic has been ripping into it for days and cant find a thing wrong with it. SO far no one I have talked with has ever heard of a 4 runner having this problem.
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Tuesday, July 10th, 2007 AT 4:37 PM

2 Replies

Tiny
LORD_ANARCHY
  • MEMBER
Well, start from the fundamentals. Air, fuel, Spark. Spark(ignition), we can assume it's good because you can turn the thing on. Air, well, it's gotta be there or you'd never actually get power. Finally, fuel. How's your fuel pump doing? Fuel filter? Fuel injectors? Check your spark plugs and see what color they are. Check this page to get a DECENT way to read your plugs.

https://www.2carpros.com/articles/mitchell1eautorepair-car-repair-manuals

Hope this helps!
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Sunday, July 15th, 2007 AT 3:37 PM
Tiny
RASMATAZ
  • EXPERT
Have it scanned for an OBD2 code/s and comeback-if you like check and bench test the coolant temperature, throttle position and mass airflow sensors for a start.
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Sunday, July 15th, 2007 AT 5:15 PM

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